# Nitrox Buddy vs Abysner

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.

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.

## The numbers

| Metric | Nitrox Buddy | Abysner |
| --- | --- | --- |
| Price | **Free** | $2.99 |
| Rating | [4.9 (468 ratings)](https://appshunter.io/ios/app/nitrox-buddy/id572411073/reviews) | **[5.0 (2 ratings)](https://appshunter.io/ios/app/abysner/id6636477320/reviews)** |
| Number of ratings | **468** | 2 |
| Positive reviews | 95.7% of reviews | **100.0% of reviews** |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Every 7 months | **Every 2 months** |
| Monetization | **Free with in-app purchases** | Paid |
| Size | 6 MB | 42 MB |
| Requires iOS | 26.0 | **15.3** |
| Devices | iPhone, iPod, Apple Watch | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Gereon Steffens](https://appshunter.io/developer/493030228) | [Roelof Rene Smit](https://appshunter.io/developer/1762786000) |

## What reviewers say

### Nitrox Buddy

[App page](https://appshunter.io/ios/app/nitrox-buddy/id572411073)

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.

**Highlights:** 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

**Features:** macOS Compatibility

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Tip | $0.99 | one-time |

**What reviewers like**

- 👍 Easy to use
- 🚀 Quick calculations
- ✅ Accurate results
- 💡 Free to use
- 🎯 Essential for Nitrox divers

**What reviewers complain about**

- 📱 Ugly iPad icon
- ⚠️ MOD calculation limited to 40% O2 in older versions
- ⚠️ MOD calculation limited to 50% O2 in older versions
- ⚠️ Needs to work with older iOS versions

**Reported bugs**

- 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**

- 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

[App page](https://appshunter.io/ios/app/abysner/id6636477320)

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.

**Highlights:** 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

**In-app purchases:** none


## Frequently asked questions

### Is Nitrox Buddy free?

Nitrox Buddy is free to download, with in-app purchases available.

### Is Abysner free?

Abysner costs $2.99, with no in-app purchases.

### Which has better reviews, Nitrox Buddy or Abysner?

Abysner is rated higher. Nitrox Buddy averages 4.9 out of 5 from 468 ratings, while Abysner averages 5.0 from 2 ratings.

### Do Nitrox Buddy or Abysner have ads?

Neither Nitrox Buddy nor Abysner shows ads.

### Which is updated more often, Nitrox Buddy or Abysner?

Nitrox Buddy ships an update every 7 months, and Abysner every 2 months. Most recently, Nitrox Buddy was updated on October 14, 2026 and Abysner on October 5, 2026.

---

*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*