Apple Watch Ultra · iPhone
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.
The in-water display
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.
NDL is green with headroom, amber as it shrinks, red when you are nearly out — you feel the change before you read it.
When you owe a stop, the ceiling depth and time become as large as your depth, with total time-to-surface beneath.
A persistent variometer down the edge — green within limits, amber, then red — plus a haptic pulse if you rise too fast.
Arrives automatically in the 5-metre band, holds and pauses with your depth, and buzzes when it is complete.


On iPhone
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.
Scrub the full depth-and-temperature curve, with descent, bottom, ascent and safety-stop phases marked.
GPS entry and exit points on a map, buddies, dive centres, species, photos and star ratings.
Import your entire history from Apple Health — even dives recorded with other apps — and export UDDF or CSV. No lock-in.

Insight
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.
Deepest, longest, coldest, bottom time, sites and regions — kept automatically.
An automatic read of each dive — ascent discipline, safety-stop quality, thermal exposure — computed privately, free.

Plan the dive. Carry your credentials.
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
Everything runs through Apple — no separate account, nothing harvested, cancel anytime. One week free.
$0
$49.99/year · $4.99/mo
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
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.
Safety first, always
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.