Apps/Pro Dive
For Apple Watch Ultra · iPhone

Pro Dive.

A dive computer that lives on the watch you already own. Bühlmann ZH-L16C with gradient factors, multi-gas planning, CCR support, automatic dive logs — engineered for recreational and technical divers, by divers.

Download on the
App Store
Apple Watch Ultra running the Pro Dive dive computer face
Apple Watch Ultra · running Pro Dive
The face

Built for the dive, not for notifications.

Big numbers. Color-coded labels. The whole face is the instrument — no fuss. The Action Button cycles compass and gas; the Digital Crown adjusts settings. Nothing else can interrupt you underwater.

Depth
0.0 m

Live, smoothed, rendered at 1 Hz.

NDL
99 min

No-deco limit, ZH-L16C.

Dive time
00:00

Auto-starts on submersion.

Asc rate
0 m/min

Smart-averaged, haptic warning.

Inside the engine

Same maths as the dedicated computers — none of the second wrist piece.

Tissue model16 compartments
ZH-L16C

Bühlmann + gradient factors

The full 16-compartment Bühlmann ZH-L16C model runs continuously through your dive. Tune conservatism with gradient factors (low/high), exactly as you would on a professional dive computer.

StandardCertified
EN 13319

The international standard for dive instruments

Pro Dive is built and validated against EN 13319.

GasesOC

Nitrox & Trimix

Configure bottom, deco and travel mixes. Switch underwater with a button press.

LoopCCR

Closed-circuit support

Fixed-PPO₂ rebreather mode, with simple bailout to open circuit.

Heading360°

Underwater compass

Clear, glanceable. Works in all watch orientations.

LogsAuto-detected

Every dive — logged, mapped, kept

Submersion is detected automatically. Profile graph, max depth, duration, min/max temperature, GPS location with reverse geocoding, dive notes — synced from watch to iPhone, optionally backed up to iCloud. All logs stored locally; no third-party cloud.

No-flySurface int.

Surface, intervals, and no-fly

The tissue model keeps running on the surface. Pro Dive shows your no-fly time, surface interval and any residual loading from your last dive — so your repetitive dives plan themselves.

PrivacyIndependent

No accounts. No tracking. No personal data collected.

Pro Dive runs on the watch. The iPhone app is purely a viewer and an iCloud sync target — there is no Pro Dive cloud, no data personal details captured, no ads. The developer (Millennium Ltd) collects zero personal data.

Questions

Things divers ask before they download.

Does Pro Dive really work as a dive computer?
Yes. It uses the depth and water-temperature sensors of the Apple Watch Ultra and runs a full Bühlmann ZH-L16C tissue model on the watch, certified to EN 13319 — the same standard dedicated dive computers are tested against. That said, you should always carry a backup computer or bottom-timer when running decompression, just as you would with any single dive computer.
Which Apple Watch models are supported?
Apple Watch Ultra (any generation). The Ultra has the depth sensor and the rugged spec needed for a dive computer; Pro Dive will not run as a dive computer on a non-Ultra watch.
Do I need my iPhone with me on the dive?
No. Every calculation runs on the watch. Logs sync to the iPhone afterwards.
Can I use Trimix and CCR?
Yes — multi-gas Nitrox/Trimix and CCR with fixed-PPO₂ setpoint and bailout are supported in the engine.
Where are my logs stored?
Locally on iPhone, with optional iCloud backup. There is no Pro Dive cloud — your data stays yours.