Thier
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Bio-age across 13 domains. Sleep and HRV from your wearable. Lab uploads that mean something. A daily protocol that adapts to what your body did yesterday.
Labcorp
Quest
23andMe
Labcorp
Quest
23andMe
Cardiovascular, metabolic, body composition, cognitive, sleep, fitness. The model reads HRV, RHR, VO₂ max, sleep efficiency, and 50+ more signals from your wearable. The number on the home screen is yours, today, not last quarter's lab work.
You don't open four apps to read your body. Open Thier. The Tools tab is the index — bio age calculator, AI Longevity Coach, lab uploads, what-if simulator, daily protocols, screenings due, the full library — each one tap away.
The lessons on your Learn tab are the ones whose science maps to your last 30 days. Cardio drift in your data? You get the cardio drift lesson. HRV-dipping during a stressful week? You get the recovery lesson. No infinite content scroll — the right lesson, at the right moment.
Clubs, posts, comments, DMs, leaderboards, share-cards. People who actually care that their VO₂ max went up. People who want to know which protein-shake brand passes the heavy-metals test. Quiet, smart, opinionated. (And invite-only at the start.)
Every data source you connect lights up a node on your Longevity Profile constellation. Wearables, labs, genetics, family history, cognitive tests, screenings, mental health assessments. The map gets denser; your bio-age gets sharper.
The bio-age model under the hood
Every coefficient documented.
Every weight cited.
Every result with an honest confidence tier.
One headline metric for each domain. Tap any of them in the app to see the full breakdown.
Bio age
Computed from 64 signals across 13 domains. Smoothed over a 25-day rolling window so you see the trend, not the noise.
Sleep
Pulled from any wearable. The 4 levers that actually move your sleep age — pinned at the top each morning.
Recovery
HRV + resting HR + sleep quality, weighted by what's mattered for YOU over the last 90 days. Recover or push, decided.
Daily protocol
Not a 30-day plan. Today's plan. Picked from your real data — not from a wellness influencer's content calendar.
Most chatbots ask discovery questions because they have no context. This one already has yours.
Bio-age, wearable trends, supplement stack, family history, last lab panel — all in context before the first message.
Every claim has a paper link. If the evidence isn't there, you get "we don't know" — not a confident-sounding hallucination.
Your stack + your meds, cross-checked against the full interaction database before any recommendation.
For the small set of questions that need a doctor, the response is "stop here, see one" — and a triage note you can hand over.
Four shapes of user. Same app. Different starting point.
CGM, wearable, bloodwork, genetic upload — Thier ranks the signals so you see what's actually moving the needle.
After surgery, illness, or a year of bad sleep. Thier baselines where you are and shows the gradient back, week by week.
Start with what your phone already knows. Three honest questions and Thier works outward from your HealthKit data.
Every coefficient documented. Every recommendation links the paper. Nothing hidden behind a wellness curtain.
"Finally an app that knows the difference between a recovery day and a rest day."
— Runner, Manchester
"My bio-age moved 1.8 years younger over a quarter. I can show you the chart."
— Biohacker, Brighton
"Five years of lab PDFs uploaded in an afternoon. Trends graphed in 3 minutes."
— Physician's assistant, Edinburgh
"I'm 49. The app talks to me like I can handle the actual data. Refreshing."
— GP, Cork
"The protocol changes based on yesterday's sleep, not last month's. That's the difference."
— Cardiologist, London
"Cycle-aware metrics by default. First longevity app to ship this without me having to ask."
— Researcher, Dublin
"Every coefficient on /science. No black box. I read the lot before installing."
— Engineer, Bristol
Drop a PDF. Thier's AI extractor parses the markers, flags them against reference ranges, and graphs them against your history.
DNA methylation
Bloodwork
Telomere length
Anything else
Features you might not browse for, but you'll use weekly.
Quarter-over-quarter trend, plotted honestly.
Phase-aware metrics, built in.
Volume + 1RM trends. Not workout logging — outcomes.
Reaction, memory, fluency. Monthly.
PHQ-9 + GAD-7 captured longitudinally.
Share a read-only view with someone who matters.
One-button freeze when life happens.
Today's bio-age + one move, on the lock screen.
Monthly trend with a single tap.
Encrypted at rest. Never sold. Never used to train a model that benefits anyone but you. The export button works. The delete button works.
A tardigrade is the most resilient creature science has found — survives the vacuum of space, boiling water, near-absolute zero. We picked it as Thier's mascot because that's what your data is asked to be.
"Finally a longevity app that doesn't open with a paywall and a Sinclair quote. The bio-age model is the first one I've trusted enough to act on."
"The fact that the daily protocol changes based on yesterday's sleep, not last month's, is the difference between this and the rest of the category."
"I am the kind of person who reads my own labs. This is the first app that talks to me like that's a normal thing to do."
"I uploaded a five-year stack of bloodwork PDFs and it had the trends graphed in three minutes. Caught a vitamin D drift my GP had missed."
"What sold me was the science page. Every coefficient documented. No black box. No wellness influencer voice."
"The AI doctor knew what my last 90 days looked like before I asked anything. That's the bit that changes how I use it daily."
Founding members get lifetime tier-locked pricing, a direct line to the founder, and an early-access iOS build. First 500 only.
