Gyrus, Privacy Policy
Last updated: 26 August 2026
Gyrus is a cognitive training app. It is built so that the data it produces stays on your device. This page describes exactly what is stored, what leaves the device, and what we never collect.
Publisher: Mounir LAKHFIF
Contact: support@gyrusapp.com
No account, no identity
Gyrus does not ask you to create an account. We do not collect your name, email address, phone number, contacts, photos, precise location, or any advertising identifier. We do not sell or share data with data brokers. There is no third-party advertising in the app.
What stays on your device
Everything you produce while using Gyrus is written to a database on your device and is never uploaded:
- your self-declared goal (focus, working memory, or mental speed);
- the results of your diagnostic and of every training session: scores, accuracy, response times;
- your cognitive pillar scores and their history;
- your difficulty level for each mini-game;
- the dates on which you completed a session, which is how your streak is computed;
- your preferences: sound, haptics, language.
Deleting the app removes all of it. There is no backup and no recovery: we cannot restore your history, because we never had a copy of it.
What leaves your device
Usage analytics: only with your consent
If you agree, Gyrus sends anonymous usage events to PostHog, which we use to understand where people abandon the onboarding and whether the program is worth subscribing to. We send only the fact that a step happened, for example "diagnostic started", "baseline shown", "paywall shown", "session completed" , together with a randomly generated identifier that is not linked to your identity, your app version, and your device model and operating system version.
We do not send your scores' content, your answers, your goal, any text, or any screen recording.
You can refuse at the first launch and change your mind at any time in the app's settings. Refusing changes nothing about how the app works.
Subscription status
If you subscribe, purchases are processed by Apple or Google, never by us. We never see or store your payment details. RevenueCat manages the subscription on our behalf and receives a random app identifier, the country inferred from your store account, and your purchase and renewal history, which is what allows the app to know whether your subscription is active, including when you are offline.
Third parties
| Service | Purpose | Privacy policy |
|---|---|---|
| PostHog | Anonymous usage analytics, with consent | https://posthog.com/privacy |
| RevenueCat | Subscription management | https://www.revenuecat.com/privacy |
| Apple / Google | Payment processing and distribution | Their respective policies |
Legal basis and your rights (GDPR)
Analytics rests on your consent, which you may withdraw at any time. Subscription management rests on the performance of the contract between you and us.
You have the right to access, rectify, erase, and port your data, and to object to its processing. Because the app holds no account, most of your data is already in your hands: uninstalling the app erases it. For anything held by our processors, write to support@gyrusapp.com and we will answer within one month. You may also lodge a complaint with your national data protection authority, in France, the CNIL.
Retention
Data on your device is kept until you delete the app. Analytics events are retained by PostHog for a maximum of twelve months. Subscription records are kept for the legal accounting period.
Children
Gyrus is not designed for children under 13 and we do not knowingly collect their data.
Changes
If this policy changes, the date at the top of this page changes with it, and any material change will be announced in the app before it takes effect.