Nitrox Buddy vs Abysner
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Nitrox Buddy
This application serves as a straightforward calculator for nitrox and enriched air divers. It quickly computes essential dive data such as Maximum Operating Depth (MOD), Equivalent Air Depth (EAD), Best Mix, and Partial Pressure of Oxygen (PPO2). It supports both imperial and metric units and offers a companion watch app for on-the-go calculations.
- Calculate MOD, EAD, Best Mix, PPO2
- Imperial and metric unit support
- Sea and fresh water options
- Selectable max oxygen content
- Selectable max partial pressure
- Companion watch app
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Nitrox Buddy is a no-frills calculator app for nitrox/enriched air divers - use it to quickly calculate the most important data for your dive: Maximum Operating Depth/MOD, Equivalent Air Depth/EAD, Best Mix and PPO2. The app works with imperial or metric measurements, sea or fresh water, and allows you to select the maximum oxygen content and partial pressure. A companion watch app puts lets you perform all these calculations on your wrist.
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 price: Nitrox Buddy at Free against Abysner's $2.99. Nitrox Buddy also leads on ratings volume (468 vs 2). Abysner's advantage is in-app purchases (none vs 1) and update cadence (every 2 months vs every 7 months). On rating, review sentiment, ads 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
Nitrox Buddy is free to download; Abysner costs $2.99 up front. Nitrox Buddy sells 1 one-off in-app purchase. Abysner asks for nothing beyond the download.
On the App Store both sit at effectively the same score — 4.9 for Nitrox Buddy against 5.0 for Abysner. That said, the two scores are not equally well evidenced: Nitrox Buddy has 468 ratings behind it against 2, so its average is the more settled of the two. Written reviews are what separate them: 96% of Nitrox Buddy's written reviews are positive against 100% of Abysner's.
Nitrox Buddy ships an update every 7 months, Abysner every 2 months. The most recent releases landed on October 14, 2026 and October 5, 2026 respectively.
| Parameter | Nitrox Buddy | Abysner |
|---|---|---|
| Price | Free — better | $2.99 |
| Rating | 4.9 (468 ratings) | 5.0 (2 ratings) — better |
| Positive reviews | 95.7% of reviews | 100.0% of reviews — better |
| Number of ratings | 468 — better | 2 |
| Update frequency | Every 7 months | Every 2 months — better |
| Ads | No | No |
| In-app purchases | Yes | No — better |
| Monetization | Free with in-app purchases — better | Paid |
| Devices | iPhone, iPod, Apple Watch | iPhone, iPad, iPod |
| Requires iOS | 26.0 | 15.3 — better |
| Further details — not scored | ||
| Size | 6 MB | 42 MB |
| Age rating | 4+ | 4+ |
| Developer | Gereon Steffens | Roelof Rene Smit |
Customer experience
Nitrox Buddy
Abysner
Bugs and requests
Nitrox Buddy
Reported bugs
4 issues- iPad icon is ugly
- MOD limit of 50% O2 despite 100% O2 setting (resolved)
- MOD limit of 40% O2 (older version)
- Does not work with older iOS versions
Requested features
4 requests- Add MOD 1.5 option
- Allow MOD calculation up to 100% O2 and indicate max exposure duration
- Change color for inappropriate mixes (e.g., 50% at 40m)
- Support older iOS versions (5 & 6)
Abysner
Not enough reviews yet to summarise bugs or requests.
In-app purchases
Nitrox Buddy
- Tip$0.99
Abysner
No in-app purchases
Questions
Is Nitrox Buddy free?
Is Abysner free?
Which has better reviews, Nitrox Buddy or Abysner?
Do Nitrox Buddy or Abysner have ads?
Which is updated more often, Nitrox Buddy or Abysner?
Other comparisons
