Depthlog vs Subsurface: which dive log app fits your diving?

Two different answers to the same problem

Both tools exist because dive logs get scattered. They solve it from opposite directions.

Subsurface is a free, open-source desktop application. It is built by a community, supports a very wide range of dive computers, and gives power users deep control over profiles, planning and technical diving.

Depthlog is a web and mobile-first logbook for recreational divers. It focuses on speed on the boat, a repetitive-dive planner that answers real bottom-time questions, and a record you can share with your buddies.

Side by side

Where Subsurface wins

• It is the reference for dive computer compatibility.
• It gives fine-grained control over profiles, gases and technical planning.
• It is free and open source, with a strong community.

If you plan decompression dives, manage many gas mixes, or simply prefer a desktop application, Subsurface is a serious tool.

Where Depthlog wins

• Mobile first: log a dive in under a minute on the boat, not at a desk.
• Planner built for the surface interval: residual nitrogen penalty, pressure groups and remaining bottom time in one screen.
• One timeline across brands: import from any computer and keep the history together.
• Sharing: buddy tags, a dive map, certificates and shareable summaries.
• No install: open the browser, log in, dive.

How they fit together

You do not have to choose forever. Many divers keep Subsurface as the desktop archive and use Depthlog for the day-to-day logbook and planning. Moving between them is straightforward: export UDDF from Subsurface, import it into Depthlog.