Plan your dive.
Dive your plan.
Abyssi is a technical dive planner powered by the Bühlmann ZHL-16C algorithm with configurable gradient factors. Precision decompression schedules, right in your pocket.
Built for technical divers
Bühlmann ZHL-16C
Industry-standard decompression model with 16 tissue compartments for nitrogen and helium tracking.
Gradient Factors
Fine-tune your conservatism with configurable GF Low and GF High values for personalized deco schedules.
Multi-Gas Planning
Plan dives with multiple gas mixes including air, nitrox, trimix, and heliox with automatic switch points.
Dive Logging
Log your dives and track tissue loading over time. Review past profiles and surface intervals.
Ascent Optimization
Configurable ascent rates across depth zones — 18, 10, and 9 m/min defaults for safe, efficient ascents.
Offline First
All computations run on-device. No internet required at depth. Your dive data stays on your device.
Join the Beta
Be among the first to plan dives with Abyssi. Get early access, help shape the product, and receive a free license when we launch.
Sign Up for Beta AccessReady to plan your next dive?
Abyssi is currently in development. Follow the blog for updates.
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