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About Abysner

Abysner is an open-source, modern dive planning tool with a focus on simplicity and usability. Built to give something back to the diving community, its primary aim is not to be the most feature-rich, but to be quick, user-friendly, and straightforward. Whether you're planning a deep technical dive or just want to check your MOD, Abysner makes dive planning smooth, accurate, and fast—perfect for use even right beside the water. Supported Features: • Models: Supports Buhlmann ZHL-16 A, B, and C with gradient factors. • Multi-Gas Support: Plan dives with Air, Nitrox, Oxygen, Trimix, Helitrox, Heliox, and more. • Oxygen: Includes OTU and CNS tracking for safe dive planning. • Customizable Settings: • Set salinity and altitude according to the diving environment. • Adjust SAC rates, ascent/descent rates. • Fine-tune decompression stop intervals and last deco stop depth. • Control max PPO2 for both during deco stops and normal diving. • Gas Picker: An intuitive interface for selecting and managing gas mixes, with critical information at your fingertips. • Automatic Contingency Plans: Automatically adjusts for longer or deeper dives, with configurable extra time and depth. • Gas Planning: • Visual chart of gas requirements per mix. • Density and PPO2 info at maximum depths for each gas. • Multi-Level Dive Planning: Plan dives across different depths with ease. Please note: CCR planning is not available yet. More coming soon!

What’s new

Version 2.1.1 · Updated May 27, 2026

Dive into Abysner 2.1! Imperial units: Full support for planning using feet, psi and cubic feet. Automatically detected based on your locale, or change manually in settings. Cylinder size presets: Quickly pick common cylinder sizes or enter a custom volume. Plus all the features from 2.0: CCR support with configurable setpoints, repetitive dive planning with surface intervals, and gas switch time configuration.

App privacy

The developer, Roelof Rene Smit, reported these privacy practices to Apple.

Data Not Collected

The developer does not collect any data from this app.

Alternatives to Abysner

Looking for apps like Abysner? Here are 6 similar apps on the App Store. The highest rated is Dive Kit: Deco Planner & Tools (5.0/5), and all 6 are free to download.

Abysner vs. alternatives
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