7 posts found
When Intel shut down Basis in 2016, the devices did not break. The servers did. The cloud model turns your health history into a loan, and the company owns the vault. Pulsyn stores everything on your phone because your phone is the only hardware you actually own.
Most health apps start with a login form because their business model requires your email before their product requires your data. Pulsyn starts with a heart rate graph because the app stores everything locally on your phone and has nothing to authenticate against.
In a post-Dobbs United States, fertility data from wearables has entered criminal prosecutions. Oura stores cycle data on AWS. Whoop stores it on their own servers. Pulsyn stores it on your phone, encrypted, with no cloud account.
On-device AI means your health data never leaves your phone. Here is the architecture, the constraints, and why it makes subscriptions unnecessary.
Most health trackers treat your phone as a dumb pipe to their cloud. When you turn on airplane mode, the app becomes a brick. Pulsyn's architecture assumes the opposite: your phone is the computer, the database lives locally, and the cloud is an optional extra.
A technical deep-dive into Pulsyn local-first encryption stack: SQLCipher, AES-256-GCM, 600,000 PBKDF2 iterations, and why we intentionally cannot recover your data if you lose your PIN.
Every smart ring app ships your biometric data to a server before showing you your own sleep score. The cloud isn't there for your convenience. It's there for their business model.
