TERO · The daily product
Clarity of action — when you need it most.
TERO is an app and the hardware that makes the read real: a Polar band that builds your baseline around the clock, a chest strap that tells the truth under load, and a coach that has your back 24/7/365. Built for how you actually live — work, training, recovery, the long game.
In build · early-adopter list open · ships with the hardware included
What you're buying
Not a streak. Not a score. A person who can carry more, hold steadier, last longer, come back faster — and feel it happening.
More load before it changes your decisions.
threshold ↑Less scatter through the pressure.
variance ↓Thinking that holds up under sustained load.
slope flatterFaster and more completely, every time.
recovery ↑Declared and measured, converged into one honest picture.
concordantA TERO user who's winning reaches for the right instrument without being told, marks the moments that matter, trusts the read, and makes better decisions under real load — because they finally have a look inside.
Clarity of action, where and when you need it most.
The Journey
From download to mastery — the road, stop by stop.
The whole experience through your eyes: what happens the second you open the app, the day you decide, the wait, the day the boxes land, the ten days we learn you, and the loop that follows. This is the road we take you down.
First Open
Download free. No paywall, no gate — the app shows you what a look inside actually looks like, then lets you want it.
The Decision
Pick your Performance Option. One price covers the hardware and your first year — every term in the open before you pay, and 30 days to decide it's for you.
Onboarding — meet TERO
Five steps and TERO knows your context, your goal, and your two anchor times — before a single band has arrived.
The Wait
The two days in transit aren't dead air. Morning Calibration and Evening Recalibration start immediately — building the habit and the felt half of your record.
Device Sync
A walked-through pairing — what each instrument is for, a charge to full, and the first time the app shows you your own live heartbeat.
We learn you
The band runs day and night, building your personal envelope — the range every future read is measured against. No verdicts yet, on purpose.
Understanding → protocol
The envelope locks. The Five Capacities surface on your own baseline, and the ten-day read turns into an action path — not an analysis.
The daily loop
The day's read, one thing to do, one moment worth marking, and one honest look at measured-against-felt — every single day.
Workouts
Capacity-development sessions, not fitness sessions. The effort is the stimulus; the recovery is the read.
Measured + felt
Are you improving — and do you feel like you are? Both answered, with the gap between them closing. That close is the deepest win we offer.
Winning
Not a streak. Not a score. A person who can carry more, hold steadier, last longer, come back faster — and feel it happening. Clarity of action, where and when you need it most.
What holds the whole way
Six things that never change.
From the first screen to the thousandth day, these hold. They're why TERO reads differently from everything else on your wrist.
Only you
Every read is against your own range, never a rank against other people. The only comparison that means anything is you, last week.
Not a score
We report a read, an estimate, an index — a look inside. No scores, no streaks, nothing to game.
About what we don't know
Sound instrumentation, well-motivated constructs — and not yet a validated instrument or a diagnosis. We tell you what we can't claim.
Both, side by side
What your body did and what you said you felt — with the gap shown. Closing that gap is the point.
Named, every time
A 24/7 band for the trend, a chest strap for the truth under load. We tell you which tool for which job.
Is yours
The continuous record belongs to you. Sessions are declared by you. Nobody sees your physiology unless you choose it.
The hardware
The right instrument for each job — and we tell you which.
Optical wrist readings alone can't carry a read you'd act on. So TERO pairs two instruments and is honest about what each one is for.
Our founder has worked with Polar hardware since 2004 — through two decades of field use in environments where a bad reading isn't an inconvenience, it's a wrong call. Polar publishes its sensor science, builds the H10 to ECG-grade beat accuracy, and makes hardware we can quality-gate honestly instead of taking on faith. We chose the partner whose instruments we could defend — because every read we give you rests on them.
Polar 360 — the trend
Stays on. Overnight recovery, resting heart rate, round-the-clock beat data. This is what builds your personal envelope — the range every future read is measured against.
| Wear | 24/7 wrist band — built for continuous, everyday wear |
|---|---|
| Measures | Continuous HR, beat-to-beat intervals with per-beat quality flags, sleep + overnight recovery (incl. overnight HRV), activity, skin temperature |
| Sensors | Polar optical heart rate (PPG), accelerometer, skin-temperature sensor |
| Standalone | Records fully on-device and syncs over Bluetooth — nothing lost out of range |
| Charging | Multi-day battery; a short top-up every 7–10 days |
Polar H10 — the truth under load
Strap up for the moments that matter — a hard session, a hard meeting, a hard conversation. ECG-grade beat-to-beat data, the signal we resolve the fine reads against.
| Signal | ECG-grade heart rate with beat-to-beat (R-R) intervals — the reference the optical devices are calibrated against |
|---|---|
| Connectivity | Bluetooth LE (two simultaneous connections) + ANT+ |
| Battery | Replaceable CR2025 coin cell — roughly 400 hours of use |
| Water resistance | WR30 (30 m) — swim-ready |
| On-board memory | Stores a session on the strap itself — capture without a phone |
Verity Sense — the flexible one
The armband for when a chest strap won't work. Optical beats are quality-gated: anything the signal can't support is excluded from every calculation — and counted, so the coverage is visible.
| Signal | Optical (PPG) heart rate with pulse-to-pulse intervals and per-beat quality estimates |
|---|---|
| Wear | Upper-arm band, or clipped to swim goggles — anywhere a strap won't work |
| Connectivity | Bluetooth LE (two simultaneous connections) + ANT+ |
| Battery | Rechargeable — up to ~30 hours of session time |
| Water resistance | WR50 (50 m); on-board memory for phone-free sessions |
Your strap sessions teach the optical bands your physiology. After that, a daytime optical read is either corrected toward your true beat-to-beat signal, or it returns nothing when the signal is too noisy to trust. We would rather show you a gap than a number we can't defend.
The daily loop
A day in TERO.
Not a feed to scroll — a decision to make. Every day gives you the read, one thing to do, one moment worth marking, and one honest look at measured against felt.
A five-minute anchor, then a declared read: how loaded do you feel, and what kind of load is it? Your capacity for the day lands on your own baseline.
The 24/7 trend keeps building in the background. No effort required.
Declared sessions and workouts — the chest strap gives clean, beat-to-beat truth under load, when it matters.
One tap the second load spikes, so the moment is in the record with its physiology attached.
Measured against felt for the day. The gap, named. What to carry into tomorrow.
Overnight recovery becomes tomorrow's capacity — the loop closes while you sleep.
The first ten days
First we learn you. Then we tell you something real.
The band runs and your personal envelope forms — your normal, from your own nights and days. No verdicts yet, on purpose: a read against a baseline we haven't earned would be a guess, and we don't guess.
The envelope locks and every read gets a reference. The Five Capacities surface for the first time, and the ten-day read turns into an action path — named practices, real dosing, aimed at the capacity that needs work first. Not an analysis. A plan.
Your declared read and your measured read sit side by side, with the gap shown. Some days they match. The interesting days are when they don't — a day your body carried more than you flagged is exactly the day worth knowing about.
The full assessment battery lives inside TERO — the same protocol that runs at osrp.tryintero.com. Take it when you want the deeper look; your daily reads and your profile speak the same language.
Performance Options
One base. Hardware included. An honest window.
Every price is the hardware plus your first year of TERO — one number, shown before you pay, restated in your order confirmation, and reachable any time. The store opens with the app; the list below is the front of the line at early-adopter pricing.
TERO + Polar 360 + Polar H10
The 24/7 trend + the truth under load
Includes your first year · renews $300/yr · free 2-day shipping
The 360 rides the wrist and builds your baseline around the clock; the H10 straps on for the truth under load. This is the base on purpose — it means the read is real from your very first session, not weeks in.
Base + Polar Verity Sense
Adds the optical armband for when a strap won't work
Includes your first year · renews $300/yr · free 2-day shipping
Everything in the base, plus the Verity Sense for sessions where a chest strap doesn't fit the moment — quality-gated like everything else we read.