Skip links
Call Now
Get a Quote
BayLanka
Case studies

Privacy-First Mental Health Data Architecture

How COGITO Builds User Trust With 100% Local Storage and Zero Cloud Synchronization
COGITO is a free, ad-free self-help smartphone app designed for emotional well-being, requiring no registration or personal data. Developed by the Neuropsychology & Psychotherapy Research Unit at UKE Hamburg, it delivers daily exercises rooted in CBT and metacognitive training to boost mood, self-esteem and life satisfaction.

Challenges

Mental health data is highly sensitive and demands the strongest privacy safeguards. Users must trust that their notes, progress, and reflections remain completely confidential. Cloud syncing and third-party analytics pose major risks, and breaches could have serious consequences. Many people avoid mental health apps for this reason, making it essential to deliver full functionality without compromising privacy.

Solutions

We implemented privacy-first architecture designed to protect user data and ensure complete confidentiality through secure, local storage systems. Built with privacy by design principles, it offers comprehensive data protection for sensitive mental health information.

  • Offline-first design storing all data locally on device
  • Zero cloud synchronization ensuring user data never leaves their device
  • User-controlled export/import allowing data portability without external storage
  • No analytics tracking implementing privacy by design
  • Secure storage using native encryption
  • Full GDPR compliance with privacy-focused architecture
  • Built-in emergency resources including crisis hotlines without tracking usage

Technologies we used

People who worked on

Janarthana Collins

Developer

Impact

Built absolute user trust with sensitive mental health information

Eliminated privacy concerns enabling users to engage freely

Achieved complete GDPR compliance without complex legal infrastructure

Prevented any possibility of data breaches through local-only storage

Empowered users with complete control over their mental health data

What our
customers say

"Most of our IT and all of our app projects are conducted with BayLanka. I had the pleasure to work directly with the BayLanka team who were extremely dedicated to the task and handled everything brilliantly."

Prof. Dr. Steffen Moritz

Prof. Dr. Steffen Moritz

Head of Clinical Neuropsychology Working Group, Department of Psychiatry and Psychotherapy, University Medical Center Hamburg-Eppendorf, Germany

Let's talk about your product.

Dr. Markus Lehmann

CEO & Co-Founder BayLanka
markus@baylanka.net

Interested to get in touch?

Connect with one of our specialists or get a quote for an engagement you have in mind. What you need starts here, reach out to learn more!

Email us

Contact us