High Pressure Planner

High Pressure Planner is a decompression planning tool for certified technical divers.

Plan multi-level, multi-gas dives on the Bühlmann ZHL-16 model with gradient factors. Build your dive step by step, choose your gases, and get a complete schedule: decompression stops, gas switches, CNS and OTU oxygen exposure, and per-gas consumption including a lost-gas bailout plan.

• Bühlmann ZHL-16 with adjustable gradient factors (plus the ZHL-12 model)
• Multi-gas planning: air, nitrox, trimix — switches planned by MOD
• Oxygen toxicity tracking (CNS %, OTU) and gas consumption per tank
• Bailout planning: simulate losing any gas mid-dive
• Tools: MOD, END and best-mix calculators
• Share dive plans as files between devices
• Your dives stay on your device — no account, no cloud

Subscription tiers follow certification levels — Advanced Nitrox, Normoxic Trimix, Full Trimix — each with a 3-day free trial. Recreational planning is free.

This app is a planning aid for trained, certified divers. It does not replace training, dive tables, a dive computer, or your own judgement.