The problem
Most movement apps were built for people who feel well. For people living with chronic pain, stiffness, or variable conditions like ankylosing spondylitis or fibromyalgia, consistency is hard for entirely different reasons — not laziness, but the daily unpredictability of how bad today actually is.
The real friction isn't motivation. It's decision fatigue. Choosing what to do when you're already exhausted is its own barrier. And apps that don't adapt to how you feel punish you for showing up on hard days.
The solution
Today, Just This removes the decision entirely. A 30-second check-in — your energy level, which areas hurt, what today looks like — produces a personalized session of 1–3 movements matched to your capacity. On hard days, the minimum that still counts. On better days, a gentle expansion.
The adaptive engine accounts for limiting areas, avoids contraindicated positions on flare days, and never loads beyond what's appropriate. There are no streaks, no shame, and no punishment for skipping — every session starts fresh.
What we built
- Adaptive decision engine — maps daily check-in to a day mode (flare, low energy, moderate, capable) and selects movements accordingly
- 153-movement library with body area tagging, contraindication logic, and per-set rep customization
- Guided session flow — timer, coaching cues, breathing support, ambient audio
- Offline-first architecture — full functionality without network, with background sync when online
- Premium tier — session notes, photos, custom routines, cloud sync across devices
- Biometric login, HealthKit write-back, end-to-end encrypted local database
Stack
- App: Flutter (iOS), Provider state management, Drift ORM (SQLite + SQLCipher)
- Backend: Supabase (auth, database, storage, realtime)
- Subscriptions: RevenueCat
- Observability: Sentry + PostHog
- CI/CD: GitHub Actions