Noctio, Explained.

Noctio is a programmable audio engine for sleep, naps, relaxation and focus.

Instead of playing recordings or streaming sounds from the internet, Noctio generates its audio directly on your device, in real time. You choose the character of the sound, shape it as much or as little as you want, and Noctio then evolves that sound automatically over the course of a Sleep or Nap session.

It is closer to a musical instrument than a conventional sleep app.

The sound you hear isn’t an eight-hour recording hidden inside the app.

Noctio’s Audio Engine continuously creates the sound while you listen. That gives us much more control over how it behaves. The sound changes smoothly, responds immediately to your adjustments and evolves over a long session without ever switching tracks or looping the same recording.

Because the engine is running locally on your device, Noctio also doesn’t need to stream audio to you while you sleep.

White noise is only one type of sound. Noctio can produce much more than that.

Its Core Sound is a generated sound field whose depth, warmth, softness, texture, movement and stereo character can all be shaped. Depending on how you configure it, Noctio can be deep and dark, soft and diffuse, warm and full, relatively still, gently evolving, or somewhere between those extremes.

There is also a separate tonal layer for binaural, monaural and experimental listening techniques.

No.

Choose a Sound Signature you like, select Sleep, Nap or Continuous, and press Start.

That can be your entire experience.

If you want more control, Noctio has quite a lot of it. We deliberately keep the advanced controls out of the way until you want them.

No.

Noctio works through headphones, earbuds, sleep headbands, pillow speakers, Bluetooth speakers, your phone speaker and other normal audio equipment.

Stereo and binaural effects naturally depend on how the left and right channels reach your ears, but the Core Sound itself does not require headphones.

Comfortable ones.

For sleep, comfort matters more than impressive specifications.

A technically excellent pair of headphones is not very useful if you want to take them off after twenty minutes. Sleep headbands, purpose-built sleep headphones, pillow speakers and ordinary earbuds can all work well.

Use whatever disappears most easily from your attention.

Noctio does not require expensive audio equipment to help you get a good night’s sleep.

They can reproduce the signal more accurately, just as they would with any other audio but Noctio is not designed around the assumption that you own expensive equipment.

If you already have excellent headphones, Noctio will make good use of them. If you do not, the product still works as intended.

Yes.

The generated Core Sound works very well through speakers, especially for masking background noise.

If you also want to use the tonal layer, the Advanced Sound controls let you choose a presentation appropriate to the equipment you are using rather than assuming you are wearing headphones.

That is fine too.

You will lose stereo spatial information, and a binaural presentation is not possible through a single mono output, but the Core Sound still works.

The tonal layer can also be configured into a monaural presentation, which makes Noctio useful with a large range of listening equipment.

Quietly enough that it can settle into the background.

There is no benefit to making sleep audio unnecessarily loud.

The right level depends on your room, your equipment and how much environmental noise you are trying to soften or mask. Comfortable and unobtrusive is a good target.

Yes.

Different Core Sound, Tone and control combinations change the energy in the signal. Noctio manages gain inside the engine and uses limiting to control peaks. These are engineering measures, rather than a guarantee that no device, interruption or listening setup can ever produce an unexpected sound.

Yes.

Noctio is designed to continue playing with the phone locked.

You do not need to leave a screen running beside your bed all night.

Yes, after activation while you have a valid stored entitlement.

The Audio Engine generates sound on your device. You do not need a connection to stream audio during normal use.

Downloading, first activation, purchasing, updates and entitlement recovery require a connection. A fresh offline installation cannot begin an unverified trial.

Android is currently in closed testing. A public download is not available from this website yet.

We are concentrating on the Android release before the iOS port. The core Audio Engine was built with portability in mind; the work is sequenced so the first release gets the attention it needs.

No.

If you do want to keep Noctio visible during a session, its reduced-information and Bedside Clock presentations are carefully designed to show useful information without turning your phone into a bright control panel beside your head.

Bedside Clock is an optional session view for people who like to keep their phone visible overnight. It turns Noctio into a purpose-built bedside display, giving the clock proper priority while keeping useful session information close at hand without leaving the full controls on screen.

It also works naturally when your phone is placed horizontally on a stand or night table. If you prefer a dark room, you can ignore Bedside Clock entirely, lock the phone and let Noctio continue running. We put real care into it because, for many people, the phone is already the thing sitting beside the bed for eight hours. It should be useful there without becoming a distraction.

Because people want different things from a bedside display.

Some people want little more than the time and confirmation that the session is running.

Others want to see timing, sleep phase, sound identity and what the automation engine is doing.

Noctio lets you progressively expose more information when you want it without forcing everyone to look at the machinery.

Your phone is still in charge of its overall audio system.

Calls, notifications, alarms and other apps can interact with Noctio according to the normal rules and settings of the device.

Noctio does not try to bypass the operating system or take exclusive control of your phone simply because a session is running.

Because trust belongs in the design from the beginning.

Noctio has no required Noctio account, advertising or behavioural tracking. It generates audio locally and does not collect a sleep or listening history. Activation and purchases are limited online operations with their own information requirements.

The privacy policy explains those records separately from ordinary listening.

No.

FrequenSee does not receive your sleep stage, sound settings or listening history through normal Noctio use. Activation and purchase records are used to administer access; they are not a sleep record.

No.

Noctio does not need to hear your environment to do its job.

It is not listening for snoring, movement or environmental noise and sending those recordings somewhere for analysis.

The app generates sound. It does not need to listen to you in order to do that.

Because we couldn’t find a good reason to make you create one.

You bought an audio tool. You should not need to establish an ongoing identity relationship with us before you are allowed to use it.

Your app-store account handles the purchase. Noctio does not need or want another account layered on top.

For activation and purchase, yes. For ordinary listening with a valid entitlement, no.

Noctio generates its audio locally. There is no overnight audio stream or recurring online check required to generate sound. If local entitlement data is removed or damaged, a connection may be needed to recover it.

The engineering and the operating economics were designed together.

Locally generated audio avoids the need for a streaming catalogue and continuous audio delivery. Noctio does not operate an advertising system or require a separate cloud account for each listener. We want some of that efficiency to benefit the customer. Final public pricing will be shown with the release.

Yes. Noctio is a one-time purchase, with no subscriptions or advertising.

You buy continued access to the purchased product after the full trial. That does not promise every future major product or expansion for free. See the purchase page for current release availability.

Because ownership is part of the product we set out to build.

Noctio generates its sound on your phone. We design and scope the product to preserve a one-time purchase. A recurring operating cost does not, by itself, justify a recurring charge to the customer.

Because you are trying to sleep.

There is also a more important reason.

Advertising changes the incentives of a product. If our revenue depended on keeping you engaged, collecting more information about you or creating more opportunities to show you something, those incentives would eventually influence the product itself.

We wanted the relationship to be simpler.

You pay us for Noctio. We make Noctio for you.

Because “some other way” almost always means the customer is still paying.

Sometimes with attention.

Sometimes with data.

Sometimes through constant upselling.

Sometimes with a subscription later.

We would rather put an honest price on the product and make the transaction obvious.

The intended commercial offer includes a full 14-day trial.

Noctio is currently in Android closed testing. Public store availability and prices will be posted on the purchase page. First activation requires a connection; after activation, a valid trial can be used offline.

The purchased product is not on a countdown toward a subscription.

We intend to improve Noctio within its purchased major version. Future major products or expansions may be sold separately. No company can promise compatibility with every future device or operating system forever.

The Audio Engine runs on your device, and ordinary use with a valid stored entitlement does not require streaming servers or a continuous connection.

A fresh installation or recovery of lost entitlement data still depends on the activation and store infrastructure. Local operation protects ongoing use; it is not a promise that every future reinstall or device will work without those services.

A Sleep or Nap session started during a valid trial can finish at its ordinary endpoint. Continuous can keep playing while the same logical session remains alive.

After a stop, service/process termination or restart, a new session requires a valid entitlement. Trial expiry is not a reason to interrupt the rest already in progress.

No. First activation needs a connection and a verified entitlement. A fresh offline installation does not start an unverified local trial.

Once activated, normal use with a valid stored entitlement works offline.

Reconnect and use the supported restore or recovery flow. Do not purchase again just to resolve an access error.

Contact support with the app build and the error. The store handles payment; we can investigate the access problem without your payment-card details.

A Sound Signature is a carefully designed starting point for Noctio’s Audio Engine.

Rather than giving you hundreds of recordings to browse through, Noctio starts with a small set of distinct, fully customizable sounds. Each has its own character and each can be shaped considerably from its starting point.

Dusk
Deep, warm, balanced and steady.

Ember
Full-bodied and grounded, with strong low-mid warmth and restrained movement.

Velvet
Soft and enveloping, with a gentler upper spectrum and broad diffusion.

Drift
Spacious and evolving, with the strongest sense of slow tonal movement.

They are better thought of as four different instruments than four tracks.

Because four genuinely different sounds are more useful than forty slightly different sounds with different names.

Each Signature was designed to occupy its own useful part of the sound space, and every Signature can then be fully customized.

Noctio moves smoothly from one Signature to another rather than abruptly switching every parameter at once. If you move from Dusk to Velvet, for example, the engine transitions between the two sound states over time so the change feels natural.

That same principle is used throughout Noctio wherever an abrupt change could interrupt the experience. Whether you make an adjustment yourself or Session Automation makes one in the background, the engine is designed to keep changes smooth and unobtrusive.

Yes.

Noctio gives you five primary Sound Controls:

Depth changes the low-frequency weight and darkness of the sound.

Warmth changes its low-mid body and fullness.

Softness shapes the upper spectrum.

Texture changes fine surface movement and spatial diffusion.

Drift introduces very slow tonal movement over time.

You don’t need to understand any of those controls technically. You can simply move one and listen.

The controls are designed to be useful by ear first and explainable in technical terms second.

It means you changed the Signature from its original design.

If you begin with Velvet and adjust one of its controls, Noctio will show Velvet · Modified.

The sound still came from Velvet, so we keep that identity rather than putting it into a separate generic bucket called Custom.

Yes. Modifying a Signature is how you do it. Noctio gives you enough range to make substantial changes without requiring deep technical knowledge.

The idea is to give you meaningful control without turning bedtime into sound design work.

They determine what Noctio does with your sound over time.

Sleep creates a structured session for a longer sleep period.

Nap creates a shorter program designed around daytime rest.

Continuous turns session automation off and simply plays your configured sound until you stop it.

The difference between those modes is much more than the timer.

Noctio takes the sound you’ve chosen and builds a complete audio program around the amount of time you’ve given it.

If you select a duration or a wake time, the Session Automation engine uses that endpoint to calculate the progression of the session. The sound does not simply begin and then remain unchanged for eight hours.

Instead, selected characteristics of the sound and tonal program change gradually over time. The session settles in, develops through a programmed sequence and eventually approaches its ending state.

The result is one continuous generated session rather than a static sound with a timer attached to it.

Yes.

Your Sound Signature defines the basic sonic character. Your adjustments define how you want that sound shaped. Your timing tells Noctio how long the session needs to be.

Noctio then uses those inputs to compile the session it will play.

A six-hour Sleep session and an eight-hour Sleep session are therefore not simply the same program with two hours removed. The timing of the progression is built around the session you asked for.

Because a normal night of sleep is not static.

Human sleep moves through repeating patterns of lighter and deeper sleep, and the balance of those phases changes across the night.

Noctio uses that architecture as the model for its own session progression. Instead of leaving your acoustic environment frozen for hours, it gradually changes selected sound and tonal characteristics according to a thoughtfully designed program.

No.

Actually determining sleep stage requires physiological information. Noctio does not have an EEG attached to your head, so it does not claim to know exactly what your brain is doing at a particular moment.

Some phones and wearables estimate sleep stages from indirect signals such as movement or heart rate. Those estimates can be useful for what they are, but Noctio does not need to pretend it has measured something it has not.

It does not follow your measured sleep phases. Noctio creates its own programmed progression.

Typical sleep structure informs session design. The product varies sound and tonal relationships over time without claiming to know your actual sleep stage or to guarantee a particular neurological state.

Noctio uses rhythmic and tonal patterns designed to encourage entrainment. No one can claim that playing a particular frequency guarantees a particular neurological state.

What Noctio can control very precisely is the stimulus: the sound being generated, the tonal relationships inside it and the way those elements evolve across the sleep session.

That gives us something much more useful than a button labelled “astral projection” with an impossible promise behind it.

Selected characteristics of both the Core Sound and the tonal program change gradually over the course of a Sleep or Nap session.

The important thing is that the automation begins with the baseline sound you chose. Dusk remains Dusk. Velvet remains Velvet. The session changes within that identity.

No.

Your chosen Signature and your own customization remain the foundation of the session.

Only the parameters that belong to the automated session progression are changed by the engine. Other settings remain yours.

This gives Noctio enough control to create a meaningful overnight progression without making your own choices irrelevant.

Drift remains your setting.

Drift already creates its own slow spectral movement, so the Session Automation system does not need to take it over.

The two systems serve different purposes and are kept separate.

No.

Nap has its own behaviour designed around a much shorter period of rest.

The broad idea is similar: settle into the session, create a useful middle period and finish gracefully. But a short nap and an eight-hour night of sleep are different problems, so Noctio does not treat them as the same program at different speeds.

Continuous turns Session Automation off.

There is no scheduled sleep progression and no endpoint. Your configured sound simply continues until you stop it.

That makes Continuous mode useful for reading, working, relaxing, travelling, masking distractions or simply listening to Noctio because you like the sound.

The Noctio audio session ends.

The first release does not generate its own alarm tone. Your phone’s alarm remains separate; supported Android flows may hand off to the system clock. Set and verify that alarm independently. Future alarm work has no announced release date.

Core Sound is the generated sound environment itself. It is the part shaped by your Signature and the five primary Sound Controls.

The tonal layer is generated separately and can be mixed with the Core Sound for binaural, monaural and related listening techniques.

You can use Core Sound on its own, the tonal layer on its own, or any combination of both together.

They balance the two sound systems and the overall output.

Core Sound controls the generated sound field. Tone controls the tonal layer. Master controls the overall Noctio output.

Noctio’s Audio Engine renders audio at 48 kHz as linear PCM and passes that signal into your device’s media audio system.

48 kHz means the engine calculates 48,000 audio samples per second for each channel. It is a widely used professional audio sample rate and provides more than enough bandwidth for the range of sound Noctio is designed to produce.

The engine performs its synthesis and session processing locally in real time. There is no MP3, AAC file or other compressed audio track being decoded in the background.

That depends on how you are listening.

Noctio hands its generated audio to the operating system’s normal media output path. From there, the operating system and your connected hardware determine how that signal reaches your ears.

With the phone speaker or a wired digital path, the signal may remain PCM through much of the chain. With Bluetooth, the phone will normally encode the signal using whatever Bluetooth audio codec has been negotiated with the connected headphones or speaker.

Noctio generates the high-quality source signal. Your device handles the final playback route.

You do not need to change anything.

Noctio continues to generate its audio at 48 kHz. If the current audio route requires a different format or sample rate, the operating system and playback hardware handle the conversion.

This is normal for digital audio and lets the same Noctio engine work through a phone speaker, wired headphones, USB audio, Bluetooth headphones, sleep headbands, pillow speakers and other supported devices.

There is no streaming bitrate in the usual sense because Noctio is not streaming a compressed file.

Numbers such as 128 kbps, 256 kbps or 320 kbps describe the data rate of compressed audio files or network streams.

Noctio generates linear PCM locally, so the quality of the source signal is determined by the audio engine rather than by a compression setting chosen to save network bandwidth.

The signal Noctio generates is uncompressed digital audio before it enters the device’s output path.

Whether it remains uncompressed all the way to your ears depends on the equipment you are using. Bluetooth, for example, normally encodes the signal for wireless transmission.

The useful distinction is that Noctio is not playing back a lossy (or lossless) recording because it generates the source signal directly.

Bluetooth can change the final transmission format because the phone and listening device have to agree on a wireless codec.

Different Bluetooth devices and codecs can therefore sound slightly different. That is true of Bluetooth audio generally.

Noctio still generates the same 48 kHz source signal before that transmission happens. For the slowly evolving sound fields Noctio creates, modern Bluetooth audio is generally a very good fit.

Not with Noctio.

Bluetooth introduces a slight delay (latency) between the phone and the sound reaching your ears. That’s important when audio has to match something happening on a screen, such as a game or video.

A Noctio session is audio with no visual component it needs to remain accurate against, so the latency has no effect once you are listening.

A binaural beat is an auditory phenomenon created when two slightly different tones are presented separately to your left and right ears. Your auditory system perceives a rhythmic beat corresponding to the difference between those two frequencies.

For example, if one ear receives 200 Hz and the other receives 206 Hz, the perceived beat is 6 Hz even though Noctio is not actually playing a 6 Hz tone. Noctio generates those tonal components directly and lets you control how separated, or combined, they are through Advanced Sound.

It can, and it gives you more control than a simple binaural/monaural switch.

In Advanced Sound, Tone Separation controls how independently the two tonal components are presented.

At one end, the components are separated left and right for a binaural presentation.

At the other, they are combined so their interaction occurs directly in the audio, creating a monaural presentation.

You can also choose any point between those two extremes.

Noctio lets you control the relationship itself rather than forcing you to choose between two fixed modes.

A binaural beat presents slightly different frequencies separately to the left and right ears. The human auditory system receives those two tones independently.

A monaural beat combines the tones before they reach your ears, so the resulting modulation exists directly in the audio signal.

They are related techniques, but they are not the same thing.

Noctio can work across that range instead of treating them as unrelated features.

For a true binaural presentation, the intended left and right signals need to reach the corresponding ears separately. Headphones provide that separation.

The Core Sound itself does not require headphones. A single speaker cannot provide a binaural presentation; Tone Separation lets you move toward a monaural presentation for that listening setup.

Core Width changes the spatial relationship inside the Core Sound itself.

At the centre is the stereo character designed for the selected Signature. Move one way and the sound becomes increasingly correlated, eventually approaching mono. Move the other way and it becomes wider and more diffuse.

Core Width and Tone Separation are different controls.

Core Width changes the generated sound field. Tone Separation changes the relationship between the tonal channels.

Carrier Shift moves the tonal centre of the generated tonal layer higher or lower while preserving the relationship between its components.

In simpler terms, it lets you move the overall pitch region without changing the basic structure the tonal system is using.

Many people will never need to touch it. It is there for people who prefer a different tonal range or want more control over what they hear.

Because most people do not need them.

Noctio is capable of exposing a lot of technical control, but showing every control all the time would make the product worse for most users.

The main interface gives you the controls that matter most. Advanced Sound is there when you want to go further.

Noctio’s tonal system includes binaural and monaural presentations and timed rhythmic relationships.

Those are properties of the generated sound. Noctio does not measure brain activity or promise that a tone will induce a specified brain state.

In this context, it refers to the idea of a response to an external rhythm.

Noctio generates controlled rhythmic relationships in its tonal layer and varies them through a session. The sound stimulus is under the engine’s control; an individual biological outcome is not.

Noctio does not make that claim.

Delta, theta, alpha and other terms describe real patterns of brain activity, but the brain does not work like a frequency selector.

Noctio uses well-informed tonal relationships and session timing in a calculated way without pretending that playing one frequency guarantees inducing a particular state of mind.

We think the actual capability is more interesting than the exaggerated version anyway.

Because tracking sleep is a different job.

Noctio’s job is to create an audio environment for rest, relaxation and focus.

We could collect indirect signals, estimate what might have happened overnight and give you another graph or report in the morning. That would not make the Audio Engine better at doing what it was designed to do.

We chose to focus on the part of the problem Noctio can control very precisely: the sound being presented to you.

No product can honestly guarantee that every person will sleep because they used it. You should be suspect of any such claims.

Noctio is informed by research in sleep, acoustics, psychoacoustics and auditory perception. We use that knowledge to make better engineering and session-design decisions.

What we sell is a carefully engineered audio tool for creating conditions conducive to sleep, relaxation and focus. We do not need to make unfounded medical claims for it to be useful.

No.

Noctio is a consumer audio product. It is not intended to diagnose, treat, cure or prevent a medical condition.

If you are dealing with persistent or serious sleep problems, that belongs in a conversation with an appropriate healthcare professional rather than a consumer product.

Noctio produces audio through normal audio playback equipment.

The main consideration is the same as with any other sound: listening level matters, and excessive volume can damage hearing.

Children should only use Noctio with appropriate adult supervision and sensible listening levels.

Noctio is designed for sleep, relaxation and focus in appropriate settings.

Do not use sleep or relaxation audio in situations where reduced alertness could create a hazard.

Because we did not start by asking what other sleep apps look like.

Noctio is closer to a piece of well-designed professional audio software than a conventional sleep app.

We wanted the interface to feel calm, precise and understandable. Controls have a reason to exist. Information has a clear hierarchy. The things you need most are easy to reach, and the deeper functionality is available without taking over the product.

The result happens to look different because the product itself is different.

Because a media catalogue is not the product we are building.

Many sleep apps are fundamentally libraries of prerecorded content, so having more recordings makes sense for them.

Noctio is an audio engine.

We would rather put that effort into making the engine better and give you a small number of excellent starting points that can be shaped across a much wider range.

Because there is nothing that needs to be streamed.

The Audio Engine generates the sound locally.

That gives us precise control over the signal, removes a network dependency and avoids the infrastructure required to send hours of audio over the internet every night.

It also helps make Noctio’s business model possible. A product that does more work on your device needs less infrastructure behind it.

Sometimes there is a good reason everyone does something.

Sometimes everyone is copying everyone else.

We do not add a feature because it has become expected in the category. We use first-principles reasoning to ask whether it makes Noctio better.

If it does, we will consider it.

If it does not, we are comfortable leaving it out.

Yes.

Every product is opinionated whether it admits it or not.

Noctio is simply explicit about its decisions.

We would rather make a smaller number of deliberate choices and execute them well than accumulate features until the product loses the original plot.

Because we wanted it and could not buy it.

There were plenty of sleep apps.

We found subscriptions, streaming libraries, accounts, tracking, advertising, enormous collections of prerecorded sounds and increasingly elaborate claims about what an app could supposedly make your brain do.

What we could not find was the product we actually loved.

A beautifully engineered audio tool that ran locally. Something private. Something precise. Something you could shape yourself. Something sophisticated enough to create an evolving overnight session instead of simply playing the same sound for hours.

We wanted a product that respects sleep science without needing to exaggerate claims, did not require an account, and could be bought once and kept.

Eventually the obvious question was why we were waiting for someone else to build it.

Because trust is difficult to bolt on later.

Before the Audio Engine existed, we decided what Noctio would and would not ask from the person using it.

That affected the architecture, the business model and the product design from the beginning.

It is much easier to build a private, local product when privacy and local operation are baseline requirements rather than an afterthought.

Quite the opposite.

Noctio exists because modern phones are remarkably capable little computers.

We think one of the more interesting things you can do with all that computing power is use it locally for the benefit of the person holding the device.

Contrary to popular belief, a system does not become more sophisticated or better because it sends everything to a server.

Sometimes good engineering means not needing network access in the first place.

Noctio’s offer is a one-time purchase, with no subscriptions or advertising.

FrequenSee designs for products people can own. We exhaust technical alternatives that preserve that relationship and can change the scope or decline a product if needed. We do not ask customers to justify why software already doing its job should remain theirs.

Products we would be happy to buy ourselves.

Products where the technology serves the person using it instead of quietly turning that person into part of the business model.

Products made carefully enough that people are willing to pay for them because they are genuinely good.

We keep coming back to one question:

What if, instead of getting better at monetizing people, we got better at making things people actually want to buy?

Noctio is our first answer.