iDeco Pro vs Abysner
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
iDeco Pro
This app is a comprehensive dive planner for technical divers, supporting both open circuit and closed-circuit rebreather (CCR) diving. It calculates decompression stops, gas usage, CNS and OTU exposure, and surface intervals. The app also includes a gas mixer for planning custom gas blends.
- Open Circuit and CCR dive planning
- Decompression stop calculation
- Gas usage and CNS/OTU tracking
- Surface interval tracking
- Gas fill/mixer functionality
- Bailout planning for overhead environments
- Configurable settings within the app
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A complete multiple dive / multi-level dive planner for the technical diver. Includes support for Open Circuit Diving as well as Closed Circuit Rebreathers (CCR). Includes decompression stops, gas usage, CNS tracking, OTU tracking, Surface Interval tracking and many other features. Currently implements the Buhlmann ZHL16/C with Erik Baker's GF algorithm. Open Circuit - Scuba : Supports Air to TriMix (any combination of O2/He/N2), with an unlimited number of decompression gases. Includes Thirds support for planning dives. Closed Circuit (CCR): Supports any O2/He/N2 combination for diluent. Automatically generates bailout plans based on entry of bailout gases. Features a Cave/Wreck bailout option for overhead environment bailouts and gas planning. Gas Fill/Mixer: Allows for filling of Air, Nitrox and Trimix via a simple, easy to use interface. All settings are configurable via the iPhone Settings. Supports US Imperial and Metric iDeco Pro vs. iDeco Pro has many features and improvements to make dive planning even easier. 1) Fully revamped user experience 2) Settings can now be changed in the app. 3) My Gases - Allows you to have a list of the 50 most used gases. Works for the dive phase, deco phase and bailout. 4) New runtime display. 5) Added much higher pressure support for mixing. 6) Superior email support - You can now view, edit and cc others on your plans. 7) Many, many more small features added. 8) Future support for many more decompression algorithms.
Abysner
This app is an open-source dive planning tool designed for simplicity and ease of use. It supports various gas mixes and decompression models, allowing for accurate planning of technical and recreational dives. Its intuitive interface makes it suitable for use even in challenging conditions.
- 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
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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!
Screenshots
Verdict
The clearest difference is review sentiment: Abysner at 100% against iDeco Pro's 52%. Abysner also leads on rating (5.0 vs 3.9) and update cadence (every 2 months vs every 18 months). iDeco Pro's advantage is chart position (#82 vs unranked) and ratings volume (10 vs 2). On ads, in-app purchases, monetization model and device support there is nothing between them.
Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS
iDeco Pro costs $8.99 and Abysner $2.99 up front. Neither carries in-app purchases, so what you see is what you pay.
Abysner holds the better App Store score, 5.0 against 3.9. That said, the two scores are not equally well evidenced: iDeco Pro has 10 ratings behind it against 2, so its average is the more settled of the two. Written reviews point the same way: 52% of iDeco Pro's written reviews are positive against 100% of Abysner's.
iDeco Pro ships an update every 18 months, Abysner every 2 months. The most recent releases landed on September 23, 2026 and September 18, 2026 respectively.
| Parameter | iDeco Pro | Abysner |
|---|---|---|
| Price | $8.99 | $2.99 — better |
| Rating | 3.9 (10 ratings) | 5.0 (2 ratings) — better |
| Positive reviews | 52.0% of reviews | 100.0% of reviews — better |
| Number of ratings | 10 — better | 2 |
| Update frequency | Every 18 months | Every 2 months — better |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Paid | Paid |
| Best chart rank | #82 — better | — |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Requires iOS | 7.0 — better | 15.3 |
| Further details — not scored | ||
| Size | 3 MB | 42 MB |
| Age rating | 4+ | 4+ |
| Developer | B2 Prototech LLC | Roelof Rene Smit |
Customer experience
iDeco Pro
Abysner
In-app purchases
iDeco Pro
No in-app purchases
Abysner
No in-app purchases







