StressTide turns your Apple Watch signals into one calm sense of how today is going. It shows how fresh each reading is and how sure it is — and when it can’t know, it says so. Observed, not a diagnosis.
Coming soon to the App Store iPhone · Apple Watch
On-device · Private by design
What’s inside
A calmer read on your day — without the fake precision.
An honest tide, not a guess
StressTide reads heart rate, HRV, resting heart rate, respiratory rate, sleep and activity from Apple Health, and turns them into one tide out of 100 — only when it has enough to be honest about it.
Confidence and freshness on every read
Every reading shows how recent it is and how sure we are. When your Watch is off, you’re mid-workout, or your baseline is still forming, StressTide tells you — instead of inventing a number.
The reasons behind it
See exactly what moved your tide today — short sleep, lower overnight recovery, late caffeine, a hard session — each factor shown with its weight and where it came from.
Reset when you need to
Paced breathing patterns — coherence, box, 4·7·8, extended exhale and physiological sigh — with a calm guided aura and reduced-motion support.
Learns your normal
For about the first week StressTide calibrates to your personal baseline, keeps conclusions soft, and tells you when a read is still provisional.
Private by design
Everything is computed on your iPhone. No account, no servers, no analytics, no tracking — nothing about your body ever leaves your device.
A look inside
Calm to look at. Honest to read.
Real screens from StressTide — a living aura, an honest tide, and the reasons behind every read.
Today
One living aura and one tide out of 100 — with how fresh the reading is and how confident we are in it.
Why
Every read is explained: sleep, overnight recovery, activity and your own notes — each shown with its weight and freshness.
Reset
Paced breathing when you need to come down — coherence, box, 4·7·8 and more, with a calm guided aura.
How it works
Three steps to an honest read.
1
Connect Apple Health
Allow read-only access to your heart, HRV, sleep and activity. StressTide reads on watchOS’s schedule — it never holds an open connection or streams you.
2
Let it learn you
For about a week StressTide builds your personal baseline, reading gently and flagging anything still provisional.
3
Read your tide — and reset
See one honest tide with its confidence, understand what moved it, and take a paced breath when you need to come down.
A living aura
A signal you can feel, in three moods.
The aura is StressTide’s living read of your body — calm to watch, never alarming.
Nebula
Soft drifting light — the default calm.
Resonance
Concentric rings — steady and grounded.
Liquid
Slow-moving colour — fluid and alive.
Private by design
Your body’s data stays on your body’s phone.
StressTide is built so your health data never leaves your iPhone. All analysis runs on-device. There is no account, no backend, and no analytics SDK — nothing about your body is uploaded, and nothing is sold to anyone, ever.
On-device only
Read-only Apple Health
No account, no servers
No ads, no tracking
An honest read is coming.
StressTide is in final preparation for the App Store. Questions or want early access via TestFlight? We’d love to hear from you.
