Privacy Policy

Last updated: 2026-09-02

NEURA (“NEURA,” “we,” “us,” or “our”) is a brain-training app. This Privacy Policy explains what we collect, how we use it, and the choices you have. It covers both the App and this website, including the free tests you can take here without an account. By using NEURA you agree to this policy.

1. Information we collect

  • Anonymous profile. NEURA works without registration. On first launch the App creates a profile identified by an internal account id and a device-scoped identifier (Apple’s identifier-for-vendor). We do not require your name or email to use the App.

  • Optional account details. If sign-in (e.g. Sign in with Apple) is available and you choose to use it, we receive a basic identifier and, if you allow it, your name and email. You may also optionally set a display name, which is what other people see on the leaderboard.

  • Country (derived, not asked for). So the leaderboard can show you a country ranking, we work out a country from information we already have: your device’s time zone (see “Device & app data” below), looked up in the public IANA time-zone database that states which country each zone belongs to. No other source is used, and nothing is sent anywhere to determine it. It is a country, never a precise location. It is worked out once and then kept unchanged, so a trip does not move you between weekly rankings.

  • Age range. On the last screen of the intro we ask which age range you are in. It is a range — “under 25”, “35–44” and so on — never your date of birth or your age in years, and we do not work it out from anything else. We use it for our own product statistics (how our audience is made up) and, later, to compare training results within age ranges; it is also attached to a small number of product-analytics events (see “In-app usage events” below). It has no effect on the puzzles you get or on your scores. It is stored with your profile; if you delete your account, that profile is anonymized (section 7) and the range may remain in our audience statistics, with nothing left beside it that identifies you.

  • Onboarding answers (earlier versions of the App). Older versions of the intro asked about your goals and the answers to a short questionnaire. We no longer ask for them, but if you answered them we still hold them, and they are still used to tune what you are shown — which games we suggest and how a day’s puzzles are picked. Like the age range above, they are stored with your profile and survive its anonymization as statistics that no longer point at anyone (section 7).

  • Gameplay data. Your game sessions and results (which games you played, rounds, answers, timing, scores), streaks, and daily-challenge activity. This is the core data the App needs to compute your progress and Focus Index.

  • Device & app data. Device type, OS version, app version, language/region, and timezone — linked to your profile and used to operate the App, keep your progress consistent across time zones, and diagnose problems.

  • In-app usage events. How you move through the App (screens opened, features used, games started/finished), collected via our product-analytics provider (Amplitude) to understand and improve the App. For the onboarding screens specifically, the same kind of event (which intro screen was shown or completed) is also recorded on our own servers, so we can see where the intro loses people and improve it; these onboarding events are kept for up to 180 days and are deleted or detached from you when your account is deleted. These events never include the content of your support messages.

  • Purchases. Subscriptions are processed by the Apple App Store. We receive purchase/entitlement status from our payments provider (RevenueCat); we never receive your card or payment details.

  • Crash & error reports. If the App crashes or hits an error, a technical report (device type, OS and app version, and what the code was doing at that moment) is sent to our error-tracking provider (Sentry, hosted in the EU) so we can find and fix the problem. These reports are configured to exclude your personal details, message content, and credentials.

  • Test runs from this website. The tests on this website run without an account, and until you finish a run nothing about it leaves your browser. When a run of the reaction time test or the Stroop test finishes, the run itself is sent to us so that we can publish statistics about that test and, where the number is steady enough to be worth comparing, tell you where your run sits among everyone else’s. (Today those are the only two tests which do this; the others send nothing at all.) What is sent is exactly this: which test it was, which variant of it you chose, the time of each round, how many rounds there were, whether it was taken on a touchscreen or with a cursor or keyboard, and the language of the page. The Stroop test adds two things of the same kind, because its score is a difference between two sorts of round and cannot be worked out without them: which sort each round was, and whether you answered it correctly. That is the whole list. Nothing that identifies you goes with it — no name, no email, no account, no cookie, no advertising identifier, and nothing that survives the tab — so a stored run cannot be traced back to you, and two runs by the same person cannot be recognised as such by us or by anyone else. We do keep this from being abused by scripts, and the way we do it keeps nothing about you either: submissions are counted against a keyed one-way hash of your network address, which exists only for the length of the counting window and cannot be turned back into the address. The address itself is never stored with a result, and no run in our database has one beside it. Finishing a run also produces an unguessable link to it (/result/<token>); whoever you give that link to sees that run and nothing else, because that is all there is to see.

    The same statistics are also fed by the App: when you finish a run of Reaction Tap there, its round times join the same anonymous pile these distributions are made of — without your account, your device, or anything else that could point back at you or at that play, which is why a run arriving this way is no more traceable than one taken here.

    Some of what is sent is published individually and not only as a total: the fastest long runs of each variant are listed publicly on the statistics page, one row per run, showing the time, how many rounds it had and roughly how long ago it was taken. There is no name on that list and no way to put one there — a row is labelled with a short code we work out from the run itself. The code belongs to the run and not to a person, so two runs by the same person get unrelated codes, and neither can be traced back to you.

  • Support requests. If you contact us via the support form — on this site or inside the App — we receive the email address, subject, and message you submit, and we keep basic technical metadata to prevent abuse of the form. A request sent from inside the App also includes your app version, device OS and your NEURA account id, so we can reproduce the problem you are reporting; the form tells you this before you send it.

  • Content reports. If you report a display name shown on the leaderboard, we record the report — the reported name, and which accounts filed it and were reported — so our team can review it and act on names that break our rules (this is how we keep the leaderboard free of offensive content). Reports are handled by staff only; reporting a name never automatically punishes anyone.

  • Advertising attribution. We measure which campaigns bring people to NEURA through our attribution provider (AppsFlyer), which in turn reports measurements back to the advertising platforms we buy traffic on (currently Meta and TikTok — see section 5). If you grant the iOS App Tracking Transparency permission, this includes limited install/attribution data (an advertising identifier and campaign source). If you decline, the App works fully and no advertising identifier is collected; measurement then relies on Apple’s aggregated reporting (SKAdNetwork) and on the ad click itself, without any identifier taken from your device. Ads we run inside the App Store’s own search results are measured differently: Apple gives the App a short-lived token that our providers (AppsFlyer and RevenueCat) exchange with Apple for the campaign, ad group and search keyword that led to the install. That token is issued by Apple, is not an identifier of you or your device, and works whether or not you granted the ATT permission — Apple treats it as measurement of its own store. In regions where the law requires your consent first, none of this starts before you accept our Terms. Alongside the install itself, the App reports a small number of milestone events to AppsFlyer — that you accepted our Terms and started the intro, and that you finished your first game (once each), plus trial and purchase events from our payments provider — so we can tell which campaigns bring people who actually use NEURA. These are milestones only: never your answers, scores, or which games you play.

  • Notifications. When you accept our Terms, your account id and basic app state (e.g. current streak, subscription status) are shared with our notification provider (OneSignal) so notifications can be set up and targeted — such as a reminder that today’s challenge is about to close, and occasionally product updates or offers. A push token for your device is added only if you grant iOS notification permission — nothing can be delivered without it, and you can turn notifications off at any time in iOS Settings; the App works fully without them.

2. What we do NOT collect

  • No precise location, contacts, photos, microphone, or health data.
  • From this website’s tests: no account, no cookie or other identifier that outlives the tab, and no IP address kept beside a result. We cannot tell you which of the runs we hold are yours, because we do not know.
  • No third-party ads or data brokers; we do not sell your personal data.
  • Your gameplay data is never used to build advertising profiles.

3. How we use your information

  • To run your training: generate puzzles, track sessions, compute scores, streaks, the daily challenge, and your Focus Index.
  • To adapt what you are shown: which games we suggest and how a day’s puzzles are picked follow your own results and, if you gave them in an earlier version of the App, your onboarding answers.
  • To understand who uses NEURA, as statistics about our audience (this is what the age range in section 1 is for).
  • To compare a website test run with the other runs taken here — App runs of Reaction Tap among them — and to publish statistics about those tests. A comparison is only ever shown once enough runs exist for it to mean anything; below that we say so instead of showing a figure.
  • To operate your subscription and unlock what you’ve paid for.
  • To keep the service safe, prevent cheating and abuse, and enforce our Terms.
  • To diagnose problems and improve the App.
  • To answer your support requests.

4. Focus Index — what it is

The Focus Index is a score computed from your own gameplay results. It reflects how your performance in NEURA’s games changes over time. It is not an IQ score, a medical or psychological assessment, or a comparison of your intelligence with other people, and it should not be used for any medical, educational, or employment purpose.

5. Third-party services

We rely on a small set of providers strictly to run NEURA:

  • Apple — App Store distribution and payments (and Sign in with Apple, if you use it). Apple also runs the ads we buy in App Store search and, through the token described in section 1, tells us which campaign and keyword an install came from.
  • RevenueCat — subscription / purchase status management. It also receives the App Store search-ads attribution described in section 1 (campaign, ad group and keyword of the install), so that subscriptions can be reported against the campaigns that produced them.
  • Amplitude — product analytics (in-app usage events) to understand and improve the App.
  • Sentry — crash and error reporting (hosted in the EU), so we can detect and fix bugs.
  • AppsFlyer — mobile attribution: measures which marketing campaigns lead to installs and to the milestone events named in section 1, and passes those measurements on to the platforms below (what is shared depends on your ATT choice — see section 1). On our website, the App Store button uses AppsFlyer OneLink to count the click and carry the campaign tags the visit arrived with (e.g. utm_…) through to the App Store — it involves no account data and reads nothing beyond that page URL.
  • OneSignal — notification delivery: account id and the app-state tags described in section 1 (shared once you accept our Terms), plus a push token if you allow notifications.
  • Meta and TikTok — the advertising platforms we buy traffic on. Through AppsFlyer they receive install and event measurements (for example, that someone accepted our Terms and started the intro, that a free trial started, or that a subscription was purchased) to gauge how our ads perform and to find people likely to do the same. Your device’s advertising identifier is shared only if you granted the ATT permission. Without it, these platforms are still told that a click on one of their ads led to an install or a subscription — matched by the click identifier they themselves generated, or through Apple’s aggregated, non-identifying reporting. Never your gameplay history, your age range, your onboarding answers, or your support messages.

Our servers are operated on infrastructure hosted in the EU.

6. Sharing & disclosure

We do not sell your personal data. We share information only with the service providers listed above to the extent needed to run NEURA, or where required by law. If you appear on the weekly leaderboard, the display name you chose and your weekly result are visible to other users; you can play without setting a display name. The leaderboard also has a per-country ranking, so which country we worked out for you (see section 1) determines which ranking you appear in — everyone you see there shares it. Weekly progress certificates you share via a link contain only anonymous figures, and so do the website test-result links described in section 1: both are public to whoever holds the link, and neither carries a name, because none is attached to them.

7. Data retention & deletion

  • Your profile and gameplay data are kept while you use NEURA so your progress and history work.
  • You can request deletion of your data from within the App. Deletion anonymizes your profile: personal identifiers (email, sign-in identifiers, display name, and similar) are permanently removed, and shared certificate links stop working. Any content reports naming you are redacted so they no longer identify you; reports you filed about others are kept as moderation history. Purchase records are retained in anonymized form as long as required for tax and legal obligations. We also send deletion requests to our analytics, attribution, and notification providers (Amplitude, AppsFlyer, OneSignal) so the usage data tied to your app identity is erased on their side too. Advertising platforms (Meta, TikTok) are separate controllers: the campaign measurements already delivered to them are held under their own policies, and we cannot erase those on your behalf — you can exercise your rights with them directly.
  • Website test runs, and the App runs that join them (section 1), are kept as anonymous statistics — the distributions and comparisons the tests show are made of them. They contain nothing that identifies anyone, so there is nothing in them for us to find and erase on request, and deleting a NEURA account does not reach them: no run is attached to an account in the first place, including the ones that came from the App.
  • Support requests are kept only as long as needed to handle them and prevent abuse, and no longer than 180 days. You can ask us to delete your support messages earlier by writing to support@neurabrain.app.
  • Backups. We keep backups of our database so we can recover from failure or data loss. A backup taken before your deletion request still contains your data: backups are never edited, but they expire automatically within 30 days. In the rare event that we restore from a backup, we re-apply the deletion requests recorded after it — so your deletion is not undone by a restore. Backups are stored in the EU (Germany/Finland) by our infrastructure provider.

8. Your choices & rights

  • Use NEURA without an account, a name, or an email.
  • Set or remove your leaderboard display name at any time.
  • Export your data from within the App (Settings → Export my data) — a machine-readable JSON file of everything we hold about you.
  • Delete your account from within the App (Settings → Delete account). This is immediate and cannot be undone. It does not cancel an App Store subscription — cancel that in your Apple Account settings.
  • Decline the tracking permission (if shown) and keep using NEURA fully.
  • Ask us to correct the country we worked out for you (section 1) if it is wrong — for example after you move. We do not recalculate it on our own, precisely so that a trip cannot move you between weekly rankings, so write to us and we will reset it; it is then worked out again the next time you open the App.
  • Depending on where you live, you may have additional rights (access, correction, deletion, portability). Contact us via the support form or at support@neurabrain.app to exercise them.

9. Children

NEURA is not directed to children. You must be old enough to consent to this policy in your country (and in any case at least 13 years old).

10. Security

We use industry-standard measures to protect data in transit and at rest. No method of transmission or storage is completely secure, but we work to safeguard your information.

11. International transfers

Your information may be processed on servers located outside your country. Where required, we use appropriate safeguards for such transfers.

12. Changes to this policy

We may update this policy from time to time. Material changes will be reflected by the “Last updated” date above; continued use of NEURA means you accept the updated policy.

13. Contact

Questions about privacy? Reach us via the support form or at support@neurabrain.app.