Your longevity stack, in one app.
Bio age. Daily protocol. AI doctor. Learning library. Wearable sync. Built native for iPhone, designed for the long game.
Five surfaces, one coherent system.
Each tab does one job and gets out of the way. No cluttered dashboards. No "wellness scores" you can't audit.
Home
Hero ring (bio age + delta), today's metrics, daily protocol checklist, an insights deck that grows with you, and your bio-age trajectory chart over 30/90/180/365 days.
Tools
AI doctor with memory, what-if simulator, family longevity mapper, screening calendar, supplement interaction checker, polygenic risk module, guided fasting / cold / heat protocols.
Learn
24 tracks. 200+ lessons. Citations inline. Quizzes. Progress + XP. Searchable across the whole library, with a daily review of cards you saved.
Social
A focused feed of people taking longevity seriously. Clubs, events, posts with longevity tags. Direct messages. A signal that you're not doing this alone.
Profile
Your stats, your streaks, your achievements, your saved memory cards. Connected apps. Subscription. Care Circle (Premium-gated accountability buddy).
Widgets + Watch
Lock-screen daily briefing widget plus a today's-protocol widget for your home screen. Both pull straight from the app's most recent sync.
A complete longevity stack.
Bio age across 13 domains
Fitness, cardiovascular, sleep, body composition, cognitive, physical function, labs, inflammation, clinical, genetic, family history, mental health, lifestyle. Every coefficient published.
Daily protocol that adapts
Five concrete actions a day, weighted by what's drifting in your data. Streaks, freeze tokens, XP, progress that compounds.
AI doctor with memory
A longevity-focused chat that already knows your bio age, sleep debt, last lab panel, and what you flagged in onboarding. Citations inline, voice mode supported.
What-if simulator
Try changes before you make them — "What if I slept 30 min more for a month?" — and see the bio-age delta in seconds.
7 wearables, one read
Apple Health, Oura, Garmin, Polar, Withings, Fitbit, Strava — connected via OAuth. Manual entry for BP, body fat, lab values.
Care Circle (Premium)
Invite a partner or parent to a magic-link summary of your progress. School-report style, not surveillance dashboard. Five active invites per user.
Daily morning briefing
Short push notification at your chosen send time. Sleep + HRV trend + the one move worth making today. Coach / gentle / terse tones.
Year in Review
A Spotify-Wrapped-style annual recap of your bio-age trajectory, longest streak, most-studied track, biggest wins. Auto-fires on signup anniversaries.
Built native, runs everywhere it should.
Thier is iPhone-native. Built in SwiftUI, designed against Apple's Human Interface Guidelines, with HealthKit at the centre and lock-screen widgets for at-a-glance reads.
- Device
- iPhone
- OS
- iOS 17 or later
- Storage
- ~80 MB
- Account
- Email + password or Apple ID
- Optional
- HealthKit, wearable accounts
- Languages
- English
Simple. One product. Two plans.
Both plans include everything. No tiered features, no upsells, no ads. Refer three friends and your next year is on the house.
Before you commit.
What does my data look like inside Thier?
Health data stays in HealthKit and your wearable provider's API; Thier reads on demand. Account state lives in Supabase, encrypted at rest and in transit. You can export or delete everything from Profile → Subscription & data.
Do I need a wearable?
No. The bio-age model degrades gracefully — fewer signals means a "provisional" badge until enough domains light up. iPhone alone (HealthKit + cognitive battery + manual BP / body-fat / lab entry) gets you a credible reading.
Is the AI doctor real medical advice?
No. The Doctor is an educational and pattern-spotting tool, grounded in your data. For anything clinical, see a qualified professional. The Doctor is trained to refuse medication-dosage and diagnosis questions and instead point you to one.
How often do you ship updates?
Roughly weekly. Thier is built by one person, in public, with a working changelog readable from the in-app About page.
What happens if I cancel?
Your data stays in your account; you can export it any time. The app stops working past the renewal date. Re-subscribe and pick up where you left off.
Is there an Android version?
Not yet. The bio-age engine and several core features are now also available as a server endpoint, so the underlying model is platform-agnostic — but the iOS app is where the experience lives in 2026.
Try Thier today.
Seven days free. No credit card if you sign up via Apple ID. Cancel before the trial ends and you're never charged.