libdivecomputer
By Jef Driesen
The open-source C library (LGPL-2.1) for downloading dives from dive computers of dozens of manufacturers. Most independent logbooks talk to dive computers through it.
Notable projects from the diving community
Divers build a lot of good software and hardware for other divers. These are projects we think are worth a look: open-source libraries, logbooks, planners, maps and homemade instruments, most of them shared on ScubaBoard or Reddit by the people who built them. None is affiliated with Dive Kit, and a listing is not a review of any project's results. Know one that belongs here? Write to hello@divekit.app.
Last updated 31 October 2026
The foundations
Two long-running open-source projects that many of the tools listed below rely on.
Subsurface
By started by Linus Torvalds and Dirk Hohndel
The open-source dive log (GPL-2.0) for Windows, macOS, Linux, Android and iOS, since 2011. Logs and plans dives, tracks gas, equipment and sites, and downloads through libdivecomputer.
Your dives, out of the vendor app
Download, read and move dive logs without a manufacturer account or a proprietary cloud.
Dive Exporter
By Simone Carletti
A free iOS app that downloads dives from a Bluetooth dive computer and exports them as UDDF, with no vendor account and no cloud. Simone also contributes to libdivecomputer and made UDDF Dive Viewer, which opens UDDF logs in the browser.
Submersion
By Eric Griffin
A free, open-source dive log (GPL-3.0) for iOS, Android, macOS, Windows and Linux. Local-first, open import and export, open circuit and rebreather dives, Bluetooth and USB downloads.
Planning, gas and weighting
Independent planners and calculators. Some do what Dive Kit does, and they are here on merit.
Abysner
By Roelof Smit (NeoTech Software)
An open-source dive and decompression planner for Android and iOS (AGPL-3.0). Bühlmann ZH-L16A, B and C with gradient factors, and several dives with surface intervals.
Dive Tools
A free web app for technical and CCR divers: a Bühlmann ZH-L16C planner for open circuit and CCR, cave profiles and one-step bailout, plus gas density, blending and top-up tools.
Optimal Buoyancy Computer
By rsingler
An Excel weighting calculator with a 50-page manual: lead, wing size, rig balance, wetsuit compression and ditching scenarios, in metric or imperial. Studying it helped shape Dive Kit's buoyancy estimator.
Open hardware
Divers building their own instruments, and publishing how.
Ægir
By Magnus, in Norway
An open-source handheld trimix analyser in progress: ESP32-P4, a 4.3-inch touchscreen, O₂ and He sensors and CO monitoring. GPLv3 software, CERN-OHL-S-2.0 hardware. Not yet qualified as a breathing-gas instrument, the project says.
DIY dive electronics
By tl5915
Build notes and code for homemade dive electronics: a scooter bottom timer in an action-camera housing, a dive computer, nitrox and trimix analysers, and the Bühlmann ZH-L16C library they share.
Dive sites and conditions
Maps, guides and forecasts that divers build and keep up together.
Divers Atlas
A free nonprofit dive-site atlas built by divers, with no AI-generated content: 6,600+ sites from some 400 members by June 2026. Featured in InDepth and at NSS-CDS 2025 and 2026.
Incidents and learning
Records and teaching tools that help divers learn from what has already happened.
DiveSafe
A searchable map of liveaboard dive-boat incidents since 2001: fires, groundings, capsizes and flooding, with vessel, operator, casualties and sources (44 incidents in October 2026). Readers can report and correct.
Dive Computer Simulator
By Antjac
A browser simulator of several dive computers' displays and algorithms, for seeing how a computer behaves through a dive. Open source (AGPL-3.0); its author says it is for learning, not for planning or conducting dives.