Your dive log that starts itself.
Monobreath turns your Apple Watch Ultra into a calm, safety-first freediving companion. It auto-records the moment your wrist enters the water — depth, heart rate and recovery — and trains your apnea on land or in the water. Everything stays on your device.
Not a dive computer. Never freedive alone.
Everything a freediver needs. Nothing that gets in the way.
Designed around one idea: the watch should do the work so you can focus on the breath and the descent.
Auto-launch on water entry
Set it once and forget it. The moment your wrist submerges, Monobreath wakes and starts recording — no tapping, no fumbling on the boat.
Depth, heart rate & recovery
Live depth and pulse during the dive, then automatic dive segmentation, surface-interval tracking and a recovery timer between dives.
Apnea trainer
Built-in CO₂ and O₂ tables, a static-hold timer and breathe-up / recovery guidance — dry on the couch or in the water.
Safety-first by design
Buddy reminders, surface-interval guidance and calm-ascent scoring. No depth chasing, no leaderboards — progress without pressure.
Dive map & spots
Every session is pinned to where you dived, auto-tagged from a surface GPS fix. See your spots and your deepest dive at each.
On-device & private
No account, no cloud, no tracking. Your health and location data never leave your iPhone and Watch. Export anytime as JSON or CSV.
Progress without the pressure.
Freediving rewards calm, not ego. Monobreath has no leaderboards and never nudges you to go deeper. It simply records what happened and helps you rest properly between dives — so your training is honest and your margins stay safe.
- Never freedive alone — always dive with a trained, attentive buddy.
- Monobreath is a training log, not a dive computer. It cannot prevent blackout.
- Surface-interval guidance suggests at least 2× your last dive time before going again.
- Never hyperventilate before a dive. Your safety depends on training and judgement.
Be first in the water.
Monobreath is in private beta on TestFlight. Drop your email and we'll send you an invite when a spot opens — plus the occasional note on what's new. No spam, ever.