Bio age across 13 domains. A daily protocol that adapts to what your body did yesterday. AI coach with memory. The library, the wearables, the science — all in one place.
Free 7-day trial£9.99/mo or £79/yearNo ads, ever↑ tap the dots to tour the home screen
Inside the app
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.
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01 Home
The number on your home screen is yours, today.
Hero ring with bio age + delta, today's metrics, the daily protocol checklist, and a trajectory chart that grows with you over 30 / 90 / 365 days.
02 Tools
Every longevity tool in one tap.
AI coach with memory, what-if simulator, family longevity mapper, screening calendar, supplement interaction checker, fasting / cold / heat protocols.
03 Learn
Lessons that fit your actual data.
24 tracks. 200+ lessons. Citations inline. Daily review of cards you saved. Searchable across the whole library.
04 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.
05 Profile
Your longevity constellation, mapped.
Stats, streaks, achievements, saved memory cards. Connected apps. Care Circle (Premium accountability buddy).
What you get
A complete longevity stack, end to end.
Built native for iPhone, computed nightly, audit-friendly.
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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. Smoothed over a 25-day rolling window so you see the trend, not the noise.
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An AI coach that has read your last 90 days first.
Longevity-focused chat that already knows your bio age, sleep debt, last lab panel, what you flagged in onboarding. Citations inline. Voice mode supported.
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Daily protocol that adapts
Five concrete actions a day, weighted by what's drifting in your data. Streaks, freeze tokens, XP, progress that compounds.
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What-if simulator
"What if I slept 30 min more for a month?" — see the bio-age delta in seconds. Try changes before you make them.
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7 wearables, one read
Apple Health, Oura, Garmin, Polar, Withings, Fitbit, Strava. Manual entry for BP, body fat, labs.
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Care Circle
Invite a partner or parent to a magic-link summary. School-report style. Premium.
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Morning briefing
Short push at your chosen time. Sleep + HRV trend + the one move worth making today.
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Year in Review
Annual recap of your bio-age trajectory, longest streak, biggest wins.
The fine print
Built native. Runs everywhere it should.
SwiftUI, HealthKit at the centre, lock-screen widgets for at-a-glance reads. Web mirror for everything that makes sense on the desktop.
Device
iPhone
OS
iOS 17 or later
Storage
~80 MB
Account
Email, password, or Apple ID
Optional
HealthKit, wearable accounts
Languages
English (more, soon)
Pricing
One product. Two plans.
Everything is included on both. No tiered features, no upsells, no ads.
Refer three friends and your next year is on the house.
Common questions
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 Coach real medical advice?
No. The Coach is an educational and pattern-spotting tool, grounded in your data. For anything clinical, see a qualified professional. The Coach is trained to refuse medication-dosage and diagnosis questions and route 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.
