Plan deep.
Surface clean.
A Bühlmann ZH-L16C decompression planner and logbook. Import your dive history, track tissue saturation, and plan the next descent with gradient factors — fully offline.
Residual tissue loading
Recent dives
Dive planner
Profile
Gases
Decompression
Repetitive dive
Profile & ceiling
Schedule
Tissue loading on surfacing
Gas requirements
Deco logbook
Settings
Model defaults
Rates & gas
Cloud account
Not signed in — the logbook lives only on this device.
Data
Everything is stored locally on this device. Export before clearing.
About
Abyss implements the Bühlmann ZH-L16C algorithm with gradient factors, NOAA CNS/OTU tracking and UDDF 3.2 import/export. It runs entirely in your browser and works offline once installed.