# Abysner — The open-source dive planner > Open-source dive planner for technical and recreational scuba diving. (iPhone/iPad app by Roelof Rene Smit.) - Source: https://appshunter.io/ios/app/abysner/id6636477320 (this page in markdown: same URL + `.md`) - Developer: [Roelof Rene Smit](https://appshunter.io/developer/1762786000) - Category: Sports - Price: $2.99 - Rating: 5.00/5 from 2 App Store ratings · 2 written reviews indexed - Age rating: 4+ - Requires: iOS 15.3 · 42 MB - Languages: American English - Released: 2024-10-08 - Data updated: 2026-08-22 - Monetization: paid - User reviews in markdown: https://appshunter.io/ios/app/abysner/id6636477320/reviews.md ## What is 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! ## Key features - Buhlmann ZHL-16 A, B, C models - Multi-gas support (Air, Nitrox, Trimix, etc.) - OTU and CNS tracking - Customizable environmental settings - Intuitive gas picker - Automatic contingency plans - Multi-level dive planning ## Recent user reviews (2 of 2) All indexed reviews: https://appshunter.io/ios/app/abysner/id6636477320/reviews.md ### 5/5 — Needs Imperial *2025-10-20* Excellent UI but I need it in imperial ### 5/5 — Clean UI! *2024-11-03* Really like this. Would love to see ft/psi as an option. ## Frequently asked questions about Abysner ### What dive planning models does Abysner support? Abysner supports the Buhlmann ZHL-16 models A, B, and C, including gradient factors for detailed planning. It also offers multi-gas support for various mixes like Trimix and Heliox. ### Can Abysner plan for rebreather dives? Currently, CCR (Closed-Circuit Rebreather) planning is not available in Abysner. The developers plan to add more features in future updates. ### What devices is Abysner compatible with? Abysner is available for iPhone, iPad, and iPod. It is designed for mobile use, making it convenient for planning dives on the go. ### How often is Abysner updated? The app was last updated on January 29, 2025, indicating a commitment to ongoing development and improvements. The current version is 1.0.7. ### What is the cost of Abysner? Abysner is a paid application, priced at $2.99. This one-time purchase provides access to all current and future features. ### Does Abysner have ads? No, Abysner does not contain advertisements. As an open-source project, it focuses on providing a clean and uninterrupted user experience. ### What age rating does Abysner have? Abysner has an age rating of 17+. This is likely due to the technical nature of dive planning and the associated risks. ### How does Abysner handle environmental factors? You can customize settings in Abysner to account for salinity and altitude specific to your diving environment. It also allows adjustments for SAC rates and ascent/descent speeds. ## Version history (last 5 releases) ### 2.1.1 — 2026-05-27 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. ### 1.0.8 — 2026-03-31 This is a maintenance release. It contains internal refactoring for upcoming features. In addition, it includes a few small feature changes, such as a higher default GF-low value and the addition of Nitrox 28 as a standard gas. ### 1.0.7 — 2025-01-29 In this release, the gas plan has been reworked. The pie chart has been replaced with a bar chart, offering a more intuitive way to see gas usage per cylinder. Additionally, you can click on the bars to view detailed information about gas usage for a specific cylinder, including exact volumes (in liters), start pressure, cylinder size, and more. ### 1.0.6 — 2025-01-29 This release fixes some bugs in how calculated gas plans are displayed. ### 1.0.5 — 2024-10-11 In this version some small bugs have been fixed related to sharing dive plans, as well as some rendering issues with tables. --- *Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-08-22.*