Apple Watch Ultra · iPhone

A serious dive computer on your wrist.

Oceanograph turns Apple Watch Ultra into a real decompression computer — depth, no-stop time, stops and safety alarms you can read at a glance underwater — with a complete logbook, planner and safety toolkit on iPhone.

Bühlmann ZH-L16C with gradient factors Multi-gas & trimix Certified to 40 m

The in-water display

Everything that matters, in one glance.

Underwater the touchscreen is locked, so the screen has to do the thinking. Oceanograph shows the two numbers a diver reads together — how deep you are and how long you can stay — as equal, oversized heroes, with the ascent-rate bar always on the edge.

No-stop time that escalates

NDL is green with headroom, amber as it shrinks, red when you are nearly out — you feel the change before you read it.

Decompression, made unmissable

When you owe a stop, the ceiling depth and time become as large as your depth, with total time-to-surface beneath.

Ascent rate you sense, not read

A persistent variometer down the edge — green within limits, amber, then red — plus a haptic pulse if you rise too fast.

A safety stop that counts you down

Arrives automatically in the 5-metre band, holds and pauses with your depth, and buzzes when it is complete.

No-stop dive on Apple Watch Ultra
Decompression stop on Apple Watch Ultra

On iPhone

Every dive, beautifully logged.

The moment you surface, your dive syncs to a logbook that actually looks like one — each entry a card with its own depth profile, grouped by year, with the sites, gas and conditions that made the dive.

Interactive profiles

Scrub the full depth-and-temperature curve, with descent, bottom, ascent and safety-stop phases marked.

Sites, maps and marine life

GPS entry and exit points on a map, buddies, dive centres, species, photos and star ratings.

Recover every past dive

Import your entire history from Apple Health — even dives recorded with other apps — and export UDDF or CSV. No lock-in.

Oceanograph logbook on iPhone

Insight

See your diving take shape.

A dashboard that turns a season of dives into something you want to look at — depth trends drawn like a profile, dives by month, your depth mix, temperature against depth — and a shareable yearly recap.

Records and totals

Deepest, longest, coldest, bottom time, sites and regions — kept automatically.

On-device dive debrief

An automatic read of each dive — ascent discipline, safety-stop quality, thermal exposure — computed privately, free.

Oceanograph dashboard on iPhone

Plan the dive. Carry your credentials.

More than a computer.

A full multi-gas decompression planner, a certification wallet that looks like the real cards, and every safety tool a diver actually reaches for.

Pricing

Log dives free. The computer is Pro.

Everything runs through Apple — no separate account, nothing harvested, cancel anytime. One week free.

Free

$0

  • Automatic dive logbook with profiles and maps
  • Import your history from Apple Health
  • Dashboard, records and Dive Wrapped
  • On-device dive debrief

Pro

$49.99/year  ·  $4.99/mo

  • The live dive computer on Apple Watch Ultra
  • Real-time decompression, NDL and safety alarms
  • Multi-gas planner — gradient factors, gas and ppO₂
  • UDDF and CSV export — no lock-in
  • Family Sharing included

An auto-renewing subscription — $49.99 a year or $4.99 a month, each with a one-week free trial. The logbook and the on-device dive debrief are free for everyone, forever.

Precision you can verify

The same algorithm the best computers use — proven, not promised.

Oceanograph runs the published Bühlmann ZH-L16C model with gradient factors, integrated with the exact Schreiner solution — the same class of engine as Shearwater and the Subsurface planner. Every coefficient is locked, and every result is checked against reference values on every build.

ZH-L16C
Bühlmann with gradient factors
16
tissue compartments, nitrogen and helium
87
automated engine tests, green on every build
40 m
EN13319-certified operating depth

Safety first, always

A precision instrument — not a substitute for training.

  • Diving is inherently dangerous. Decompression models are statistical — no computer or algorithm eliminates the risk of decompression sickness.
  • Use Oceanograph only if you are a certified diver, and dive within the limits of your training. Never rely on any single device — carry a redundant, independent computer or tables.
  • Oceanograph is not a medical device and provides no medical advice. Consult a physician about your fitness to dive.

Built for divers who care about the details.

Free dive logbook and Apple Health import. Oceanograph Pro unlocks the live dive computer and the full multi-gas planner — $49.99 a year or $4.99 a month, one week free. All through Apple.