On this page
What Bernie is
Mindflex is a learning app for psychology, built by psychologists in Berlin. You chat or call with Bernie, your AI learning companion, about whatever is on your mind. He explains what is going on in plain words, names the psychology behind it, and suggests one small thing to try.
The 78 concepts come from established psychological research, such as acceptance and commitment approaches (ACT) and cognitive psychology. You earn XP when you try something new, keep a streak, and every concept you discover lands in your personal library.
What Mindflex IS
- A learning app for psychology
- An AI learning companion that explains concepts with your own examples
- Built by psychologists in Berlin
- XP, streaks and a personal library of concepts
What Mindflex is NOT
- Not a human: Bernie is an AI
- Not personal advice from qualified professionals
- No professional relationship
German founder team
The concepts, explanations and instructions behind Bernie are written by our own psychologists.
Felix Mai
Moritz Tiedemann
Julian Hecht
Academic background
The founding team met during their psychology studies in Potsdam, Germany. In Germany the title Psychologe is regulated by law and requires a completed Master's degree. This is the psychological expertise behind how Bernie explains concepts.
How the AI works
You should know how Bernie works. Here is what happens when you send a message or start a call.
How Bernie answers
Bernie runs on large language models. Chats and calls are processed by Google's Gemini. If Gemini is unavailable, chats fall back to Anthropic's Claude. Your message is processed alongside instructions written by our psychologists, and the AI follows these guidelines.
Always an AI
Bernie is an AI, and Mindflex says so openly. You are always talking to an AI, never to a human.
No training on your data
Your conversations are never used to train AI models. Neither Anthropic's nor Google's API uses customer data from paid API access for training.
Data & privacy
Your conversations are personal. We handle them with the highest level of care. All data processing is GDPR and CCPA compliant, and we never sell your personal data.
What we collect
| Data | Purpose | Stored where |
|---|---|---|
| Email address | Authentication | Supabase (EU, Frankfurt) |
| Display name | Personalization | Supabase |
| Chat messages | Conversation continuity | Supabase (encrypted) |
| Device token | Push notifications | Supabase |
| Timezone / City | Reminder scheduling | Supabase |
| App events + device advertising identifier (only if you consent) | Ad measurement | Shared with TikTok |
What we do NOT collect
| Real name (optional, you choose) |
| Phone number |
| Location data / GPS |
| Biometric data |
| Contacts or photos (unless you share an image in chat) |
| Your advertising identifier, unless you consent to ad measurement (see below) |
Special categories of personal data (Art. 9 GDPR)
Some of what you share in conversations can count as special categories of personal data under Art. 9 GDPR. We only process this data with your explicit consent (Art. 9(2)(a) GDPR). Giving it is voluntary, and you can withdraw it at any time.
📈 Advertising measurement (optional, consent-based)
To see which ads help people find Mindflex, we can share basic app events (install, trial start, purchase) plus your device advertising identifier with TikTok, but only if you consent on the dedicated screen at the start of onboarding.
Never shared: your conversations, your answers, or anything you write or say. Decline and the ad SDK stays off; the app works exactly the same. Turn it off anytime under Settings → Ad measurement. Legal basis: Art. 6(1)(a) GDPR and § 25 TDDDG (your consent).
Encryption
In transit: TLS 1.2+ for all API calls.
At rest: AES-256 encryption on all stored data via Supabase.
Random user IDs
Chat data is stored with random user IDs. Your email is only linked to your auth account, not embedded in conversation data.
External Data Protection Officer
Our data protection is certified and monitored by heyData GmbH, a professional GDPR compliance partner based in Berlin, Germany. They serve as our external Data Protection Officer (Datenschutzbeauftragter) as required by EU law.
Your rights & control
You are always in control of your data. These rights are available to every user, at any time, with no barriers.
🗑️ Delete your account
Settings → Delete Account. All personal data (email, name) is permanently deleted. All chat data is fully anonymized, so there is no way to trace it back to you.
📦 Export your data
Settings → Export Data. Download a complete copy of all your data at any time, as required by GDPR Article 20 (right to data portability).
↩️ Withdraw consent
You can withdraw your consent to the processing of special categories of personal data (Art. 9 GDPR) at any time. Processing before withdrawal remains lawful.
What Mindflex does not do
Mindflex is a learning service and does not replace personal advice from qualified professionals.
In an emergency, call your local emergency number.
Age policy
Mindflex is designed for adults. We take the protection of minors seriously.
Age requirements
Users must confirm they are at least 16 years old (EU/GDPR) or 13 years old (US/COPPA) before using the app. This confirmation is collected via an explicit checkbox on the consent screen and recorded with a timestamp in our database.
Mindflex is not designed for, marketed to, or intended for use by children. If we become aware that a user is under the minimum age, their account will be terminated and all associated data will be deleted.
Technical partners & data processing
We work with carefully selected partners. Each processes only the minimum data necessary for their function. Data Processing Agreements (DPAs) are in place as required by GDPR Article 28.
| Partner | Function | DPA Status |
|---|---|---|
| AI model (Gemini), processes chat messages and voice calls to generate responses | ✓ Signed | |
| Anthropic | AI model (Claude), backup model for chat | ✓ Signed |
| OpenAI | Auxiliary AI processing | ✓ Signed |
| LiveKit | Real-time audio transport for voice calls | ✓ Signed |
| Supabase | Database, authentication, encrypted storage | ✓ Signed |
| RevenueCat | Subscription management | ✓ Signed |
| PostHog | Error monitoring and product analytics, EU hosting (no personal data in reports) | ✓ Signed |
| Vercel | Website hosting and privacy-friendly page analytics (no cookies, no session recording) | GDPR compliant |
| Expo | Push notifications, app delivery | GDPR compliant |
| heyData | External Data Protection Officer | ✓ Contracted |
Contact & complaints
General contact
Mindflex UG (haftungsbeschränkt)
Berlin, Germany
hello@mindflex.world
Data protection
External DPO: heyData GmbH
Berlin, Germany
For data protection inquiries, contact us at hello@mindflex.world
Complaints
If you believe your data protection rights have been violated, you have the right to lodge a complaint with your local data protection supervisory authority. In Germany, this is the Berliner Beauftragte für Datenschutz und Informationsfreiheit (BlnBDI).
We encourage you to contact us first so we can address your concern directly.