Terms of use

Flickerfield comes from Kallos Labs LLC, 1209 Mountain Road Pl NE, Ste R, Albuquerque, NM 87110, United States. Mail sent to support@flickerfield.app is answered by a person.

This page is the contract between you and Kallos Labs LLC for the Flickerfield app on your phone and for this website. By using either one, you agree to it. If you disagree, leave the app alone. Here, “we” means Kallos Labs LLC, “you” means whoever is using the app, and “the app” covers every update and every pre-release build of it.

The app is made for healthy adults of 18 or older, not for children. If you are under 18, you may not use the app, and you may not let anyone else use it through your device. The app asks for your age before your first session. Giving a false age breaks these terms.

Children and teenagers are the people most likely to react to flicker. That is why 18 is a fixed limit with no exceptions.

We give you permission to use the app on devices that belong to you or that you control, for yourself and not for business. The permission is personal. We may give the same permission to others, you cannot pass yours on, and we can withdraw it. You may not copy, resell, rent, sublicense, reverse-engineer or redistribute the app or any part of it, unless the law forbids us to restrict that.

All intellectual property in the app, its journeys, its text, its artwork and this site stays with us. Section 19 adds the store rules, which narrow this licence further. The licence stops when these terms stop.

Flickerfield is a general-wellness app for relaxing. It flashes an exact, frame-locked pattern of light from your device’s screen, which you watch through closed eyelids, and it can add isochronic tones or binaural beats if you choose. It is meant for healthy adults of 18 and over who want to relax, unwind or explore their own experience.

This app is not a medical device. It does not diagnose, treat, cure or prevent any medical condition. Consult a healthcare professional for medical advice. Do not use if you have or may have photosensitive epilepsy.

Nothing inside the app, on this site or in a reply from us counts as medical advice. If you are unsure whether the app is safe for you, leave it unused and ask a doctor. Some people should not use it at all.

Flicker can set off a seizure, a migraine, nausea or disorientation. It can happen to someone who has never had any trouble and has no diagnosed condition. Before your first session the app shows a safety screen, which you must read and acknowledge. Using the app is your confirmation that:

• you do not have photosensitive epilepsy, and you have no reason to think you might;
• neither you nor anyone in your family has a history of epilepsy or seizures; you have no migraine with aura, no heart condition and no pacemaker; you have not hurt your head recently; you have no condition that involves psychosis or dissociation; you are not pregnant; and nothing you take lowers the seizure threshold;
• the moment you feel unwell or notice a stop sign, you will end the session; and
• your eyes stay shut whenever the screen is flickering, without exception.

The safety page has the complete list, in the order the app shows it.

Of everything on this page, this section matters most.

Flicker can give you a seizure, and you accept that. It can also bring on migraine, headache, nausea, dizziness, fainting, twitching, disorientation, a pounding heart or a sudden wave of fear. That can happen to a person with no past trouble who gave a true answer to every question on the safety screen. The app has no way to know beforehand whether that person is you.

A reaction can also hurt you in ways that have nothing to do with the light itself: a fall, a knock to the head, or an injury later while you are still unsteady. So sit or lie down where you cannot fall. Never stand during a session.

You use the app by your own choice, knowing all this. No one makes you. The risk is yours.

Every time you start a session, you confirm that:

• none of the exclusions in section 5 apply to you, and nothing about them has changed since you last checked;
• you are seated or lying where you cannot fall, the room lights are off, the device is 20–30 cm from your face and your eyes stay closed the whole time;
• for your first sessions, someone is close enough to hear you call;
• you know the stop signs (twitching, dizziness, nausea, an odd aura, the start of a headache) and you will stop as soon as one appears; and
• one tap anywhere ends the session at once, leaving the app does the same, and no session ever has to be finished.

If one of these is not true, don’t begin. The caps and the cooldown are ceilings, not goals. They shorten a session without making it safe.

Stop the session and phone your local emergency number straight away if you, or anyone near you, has a seizure, collapses, cannot be woken, is hurt, or shows any other sign of a medical emergency. That is 999 or 112 in the UK, 911 in the US and Canada, and 112 across the EU. If you can’t tell whether it is an emergency, treat it as one.

The app is no help here. No sensor in it watches you. It cannot notice a seizure, a faint, a fall or any other medical event, and it will never phone anyone for you. The one thing it can do is stop the light, and it does that as soon as you tap the screen or leave the app.

We are not an emergency service, a helpline or a medical service of any sort, and you must never depend on us in that way. A person reads mail sent to support@flickerfield.app during working hours only.

After any reaction at all, stop using the app, and see a doctor before you use it again.

Other people can see a session while it runs. The screen is bright and flickering, the device may switch on its torch, and in a dark room the light carries further than you would think. Light you aim at your own closed eyes can affect someone who never read the safety screen.

Do not begin a session, or carry one on, if:

• anyone who can see the screen, the torch or the light they cast is photosensitive, has epilepsy, a history of seizures or migraine with aura, or has not read the exclusions;
• a child can see it, even for a moment;
• an animal can see it. Flicker can set off seizures in dogs and cats, and they have no way to tell you;
• you are driving, cycling, running machinery or looking after someone else. The same holds for the 15 minutes after a session;
• you are in or near water, somewhere high, near stairs or a road, or anywhere a faint could be dangerous;
• you are somewhere public, such as a bus, a train, a plane, a waiting room, a bar or a gym, where the people around you did not choose this; or
• flashing light is restricted or banned there, for example on an aircraft, in a hospital, in a school, or at a venue with a photosensitivity policy. That rule takes priority over these terms.

Don’t record the flicker and post it anywhere, and don’t screen-share, cast or mirror a session. Anyone you let watch or use a session is your responsibility. If they are harmed, section 22 applies.

Only you can answer the questions in the safety gate. The app has no way to check your answers. Each point below is yours to get right before every session.

• Tell the truth. Give your real age and go through every health exclusion honestly, family history included. Ticking a box you are not sure of is no small thing. Your answers are the protection, and a false one breaks these terms.
• Check again each time. Some exclusions can change within a week: a new medicine, a knock to the head, a pregnancy, a poor night’s sleep, an illness. Something that held when you set up the app may not hold today.
• Medication. If anything you take lowers the seizure threshold, don’t use the app. Bupropion, tramadol, some antipsychotics, antidepressants and stimulants all do. Check your medicine’s leaflet or ask a pharmacist. If you can’t find out, don’t use the app.
• Alcohol and recreational substances. Nothing in the 24 hours before a session and nothing during it. Alcohol withdrawal sharply lowers the seizure threshold, so the morning after heavy drinking is among the worst times for a session.
• Sleep and general state. Don’t use it while short of sleep, unwell, feverish or badly dehydrated. Missing sleep ranks among the strongest seizure triggers known.
• Never pass the device on. Not during a session, and not to give someone a look. Every person who uses the app goes through the safety gate personally, as an adult who has read the exclusions.
• Keep the device to yourself. Lock it with a passcode, and keep the app off any device that children or other people pick up.
• Do what the app asks. Keep the brightness low and your eyes closed, respect the caps and the cooldown, and take the 14–25 Hz caution band seriously. Never modify the app, and never use anything that lifts one of its limits.

• No sessions while driving, running machinery or in water.
• Never show a running session to a child, or to anyone who has not read the exclusions.
• Don’t record a session and post the flicker. Flashing between 3 and 55 Hz is unsafe for other people and breaks most platforms’ own rules.
• Don’t use the app to hurt yourself or others, to break the law, or to get around the safety gate, the session caps or the cooldown.
• Don’t try to bypass, switch off or fake the checks on purchases and entitlements.

If you break this section, we may suspend your access.

Downloading the app costs nothing, and so does its free tier. The Color Spectrum comes as three purchases. The App Store or Google Play sells each one and takes the payment, in your local currency, at the price the paywall shows when you buy:

• The Color Spectrum Monthly: $7.99 per month, renewed each month.
• The Color Spectrum Yearly: $34.99 per year, renewed each year, starting with a 7-day free trial.
• The Color Spectrum Lifetime: $79.99, paid once. It is a single purchase, not a subscription, and it never renews.

Only the The Color Spectrum Yearly plan has the 7-day free trial, and each store account can have it once. Unless you cancel before the trial is over, it becomes a paid year at the price shown.

Subscriptions keep renewing on their own until you cancel. You can manage or cancel them whenever you like in your store account settings.

A subscription renews by itself unless it is cancelled 24 hours or more before the current period ends. Your store account is charged for the renewal within 24 hours of the period’s end. Cancelling prevents the next charge, and the period you are in still runs until it ends.

You cancel through your store account. We have no way to cancel a subscription for you: cancel through the App Store or through Google Play.

Apple or Google takes every payment, so their own policies decide refunds. We can’t refund a store purchase ourselves. Write to us, though, and we will help you ask: ask Apple for your money back · ask Google Play for your money back.

If the law gives you a right to cancel a digital purchase, such as the 14-day right in the UK and EU (as far as it still applies after you start using the content), this section leaves that right as it is.

The Color Spectrum belongs to the store account that paid for it, because Flickerfield has no login: no sign-in and no password. On a new device, go to Settings → Restore The Color Spectrum, or tap Restore The Color Spectrum on the screen where you buy it. If that doesn’t bring it back, email support@flickerfield.app with your App User ID (Settings → About) and we will restore it manually.

Prices for future periods may change. If a change touches a subscription you already have, the store tells you beforehand and, where its rules say so, asks you to agree. You can cancel before the new price starts. A period you have already paid for never changes price.

Buying The Color Spectrum Lifetime unlocks The Color Spectrum in this app, updates included, for as long as we keep publishing it. Any other product we release later is not included. If we stop publishing the app, the purchase gives you no right to a refund. It stays with the store account that bought it, and you cannot transfer it.

Now and then we put out pre-release builds through TestFlight, Google Play testing tracks or internal distribution. Such a build is unfinished. It may crash, lose your session log, get timings wrong, cut a session off instead of fading it out, or have bugs in the flicker itself. We can pull a build at any time, and most stop working on a set date.

A pre-release build follows every safety rule on this page, exactly as the released app does, and it calls for more care from you, not less. The safety gate, the caps, the cooldown and the caution band are all written in code, and code that is still being tested can be wrong. If a build does something the safety screen didn’t describe, end the session and write to us at support@flickerfield.app.

Pre-release builds cost nothing and come “as is”, with no warranty and no promise of support. Never give one to anyone who has not been through the safety gate as an adult.

Your session log, mood ratings, notes, favourites and settings stay on your device and nowhere else. We don’t collect them, and we can’t get them back for you. Removing the app removes them, so make your own copy if you want to keep them. The privacy policy lists everything in full.

When you send us feedback, such as a bug report, an idea, a review or a support message, we may use it anywhere and however we like. We owe you no payment, credit or other duty for it, and you confirm that it is yours to send. Feedback is not confidential to us, so leave out anything you need kept private.

Please don’t send health details about yourself or anyone else. If you do, we will delete them. Tell us only what the app did and what you saw.

Apple and Google are not parties to these terms, which bind only you and us. Apple requires the points below. They apply when your copy of the app came from the App Store.

• Who the agreement is with. You agree these terms with us alone, not with Apple. We, and not Apple, carry sole responsibility for the app and everything in it.
• How far the licence goes. The section 3 licence cannot be transferred. It covers your use of the app on Apple-branded products that belong to you or that you control, within what the Usage Rules of Apple’s Media Services Terms and Conditions allow. Other accounts linked to you through Family Sharing or volume purchasing may use it too.
• Upkeep and support. Maintaining and supporting the app is our job alone. Apple has no duty of any kind to provide maintenance or support for it.
• Warranty. Any product warranty, whether we give it or the law implies it, is ours alone to answer for, unless it has been validly disclaimed. If the app does not live up to a warranty we give, you can tell Apple, and Apple will pay you back the purchase price. Beyond that refund, and as far as the law allows, Apple owes no warranty duty at all. Any other claim, loss, liability, damage, cost or expense that comes from the app failing a warranty is for us to deal with, not Apple.
• Product claims. Claims about the app, from you or anyone else, are ours to handle, not Apple’s. That includes claims about having or using it, product liability claims, claims that it breaks a legal or regulatory requirement, and claims under consumer protection or privacy laws.
• Intellectual property. If someone says the app infringes their intellectual property rights, investigating, defending, settling and discharging that claim is entirely up to us. Apple bears none of it.
• Sanctions and embargoes. You state, and guarantee as true, that you are not in a country under a US Government embargo or one the US Government has designated as “terrorist supporting”, and that your name appears on no US Government list of prohibited or restricted parties.
• Developer name and address. Send questions, complaints and claims to Kallos Labs LLC, 1209 Mountain Road Pl NE, Ste R, Albuquerque, NM 87110, United States, support@flickerfield.app.
• Other providers’ terms. When you use the app, keep to any third-party terms that apply to you, such as those of your mobile data plan.
• Apple’s right to enforce. Apple and its subsidiaries benefit from these terms although they are not parties to them. Once you accept these terms, Apple gains the right to enforce them against you, and is treated as having accepted that right.

Google Play. If your copy came from Google Play, the agreement is still between you and us. Google is not a party, and answers for neither the app nor its support. Your purchase is also covered by the Google Play Terms of Service and Google’s refund policy. Where a store rule gives you more than these terms do, you get the store rule.

We provide the app and this site “as is” and “as available”. We give no warranty of any kind, stated or implied. That covers fitness for any specific purpose, accuracy, and availability without interruption. We make no promise that the app will give you any particular experience. People respond very differently, and some notice almost nothing. No result is guaranteed.

We also make no promise that the app works on every device, that an OS update won’t break it, or that it will always be there without a break. Your consumer rights, set out in section 21, are not affected by any of this.

Your use of the app is entirely at your own risk. As far as the law allows, we are not liable for harm, injury, loss or damage that comes from using it. That includes a seizure, migraine, nausea, disorientation or any other reaction to flicker, and it includes indirect or consequential loss.

As far as the law allows, we are also not liable for: indirect, incidental, special or consequential loss; lost profit, revenue or opportunity; data lost or corrupted, including the session log and notes on your device; harm that results from you breaking these terms; or harm caused by a device, an operating system or a store outside our control.

The ceiling. Where the law lets us limit our liability but not exclude it, the most we will pay for all claims combined is the amount you actually paid for the app through the App Store or Google Play during the twelve months before the event behind the claim. Put simply: after a year of The Color Spectrum, the most we could owe you is what that year cost. If you only ever used the free tier, you paid nothing, so the ceiling is zero.

Liability that stays in place. These terms do not limit any liability that the law says cannot be limited. In the UK and the EU, that covers death or personal injury caused by negligence, and fraud. If any sentence on this page seems to exclude one of those, read it as not doing so.

Your consumer rights stay. As a consumer you have legal rights that these terms cannot remove or reduce. In the UK they include your rights under the Consumer Rights Act 2015 that digital content is of satisfactory quality, fit for purpose and as described. Your own country’s consumer law may give you matching rights. If these terms clash with those rights, the rights win.

If a claim, loss or cost arises because you broke these terms, misused the app, or showed a session to someone who had not read the exclusions, you will cover us for it. We will let you know about any such claim quickly, and we won’t settle it without asking you first.

For consumers, this section applies only as far as the law permits, and never to a claim caused by our own fault.

You can end this agreement whenever you like by removing the app and no longer using this site. Removing the app leaves any subscription running, so cancel it in your store account as section 12 explains.

If you break these terms, we may suspend or end your access. That applies especially if you give false answers to the safety gate, get around the caps or the cooldown, show sessions to people who have not read the exclusions, or use the app unlawfully. If the breach is small and can be put right, we will ask you to put it right first. If someone could be harmed, we may act at once.

We may also withdraw the app if we can no longer support it safely. If that happens during a period you have paid for, we will ask the store to refund the unused part where the law or the store’s rules require it.

Once this agreement ends, so does your licence, and you must stop using the app. Sections 4 to 9, 18, 20, 21, 22, 24, 25 and 26 keep applying, and so does any other section that by its nature is meant to outlast the agreement.

Write to us first. If something has gone wrong, email support@flickerfield.app and say what the problem is, what you would like us to do and how we can reach you. We both agree to spend 30 days trying to settle the dispute informally, counted from the day either of us first raises it in writing, before either of us starts formal proceedings. Either of us may still ask a court for an urgent injunction, and you may still go to a regulator or an ombudsman.

If talking fails. Then the dispute is heard by the courts named in the next section.

If you live in the UK or the EU. This section does not remove your statutory rights, your right to start proceedings in the courts of your home country, or the protection of that country’s mandatory consumer law. In the EU you may also use an approved alternative dispute resolution body, or an online dispute resolution platform if one is open to you.

The law that applies to these terms is the law of New Mexico, in the United States. Disputes about them belong exclusively to the state and federal courts sitting in Albuquerque, New Mexico. If you are a consumer, the mandatory protections of the country where you live still apply to you, and so does any right it gives you to bring a claim in its own courts.

• If one part fails. If a part of these terms turns out to be unlawful or unenforceable, it is narrowed where that works, or otherwise treated as deleted, and everything else still applies.
• The whole agreement. Together, these terms, the privacy policy and the safety text inside the app make up everything we have agreed about the app, and they take the place of anything said before. This does not limit our liability for fraud.
• Late enforcement. Waiting to enforce a term does not mean we have given up the right to enforce it.
• Transfers. Your rights under these terms cannot be transferred. We can transfer ours to a company that takes over the app, as long as your rights are not reduced.
• Things beyond our control. We are not liable for any failure or delay caused by events we cannot reasonably control, such as a store outage, a network failure, a change to an operating system or to the law, industrial action, fire or flood.
• Writing to each other. Reach us at support@flickerfield.app, or by post at Kallos Labs LLC, 1209 Mountain Road Pl NE, Ste R, Albuquerque, NM 87110, United States. There is no account for us to write to, so our notices to you appear in the app, on this site or through the store.
• Language. English is the language of these terms, and the English text is the one that governs. Translations are a convenience only. If a translation differs, the English wins, unless your country’s law says otherwise.
• Export rules. You may only use or export the app as the law allows, both in the country you are in and in the country you downloaded it from. That includes US export controls and the statements you make in section 19.
• Who can enforce. Only you and we can enforce these terms, with one exception: Apple and its subsidiaries, as section 19 explains.
• What outlasts the agreement. Section 23 lists the sections that still apply after this agreement ends.

We may revise these terms. When we do, the version number and date at the top are updated, and the app tells you about any material change before it starts to apply. If you keep using the app after that, you accept the new version. If you don’t accept a change, stop using the app.

• 1.4 (9 November 2026): Full Spectrum, the paid upgrade, is now called The Color Spectrum, and its plans The Color Spectrum Monthly, Yearly and Lifetime. Prices, the trial and every other term stay as they were.
• 1.3 (3 November 2026): the paid upgrade, previously Pro, became Full Spectrum, with plans called Full Spectrum Monthly, Yearly and Lifetime (prices, trial and terms as before); the app description no longer mentions coloured noise; the restore section now states that Flickerfield has no sign-in and no password; the courts became those sitting in Albuquerque; sections 2 and 27 got new titles.
• 1.2 (21 September 2026): added the operating entity, its address, the governing law and the courts; dropped the arbitration and class-action placeholders.
• 1.1 (17 September 2026): new sections on assumption of risk, emergencies, bystanders, your responsibilities, beta builds, feedback, store terms, termination, disputes and general clauses; a longer limitation of liability; a table of contents.
• 1.0 (17 September 2026): the first version put online.

Read these alongside the privacy policy and the safety page.