Nitrox Buddy vs Flaska
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.
Flaska
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A scuba tank calculator utility app -- calculates rock bottom air requirements, gas time, and transfills for various tank sizes.
Screenshots
Verdict
The clearest difference is in-app purchases: Flaska at none against Nitrox Buddy's 1. Flaska also leads on update cadence (every 2 months vs every 7 months) and iOS requirement (13.0 vs 26.0). On price, 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
Both are free to download. Nitrox Buddy sells 1 one-off in-app purchase. Flaska asks for nothing beyond the download.
Nitrox Buddy ships an update every 7 months, Flaska every 2 months. The most recent releases landed on September 25, 2026 and September 17, 2026 respectively.
| Parameter | Nitrox Buddy | Flaska |
|---|---|---|
| Price | Free | Free |
| Rating | 4.9 (468 ratings) — better | — |
| Positive reviews | 95.7% of reviews | — |
| Number of ratings | 468 — better | — |
| Update frequency | Every 7 months | Every 2 months — better |
| Ads | No | No |
| In-app purchases | Yes | No — better |
| Monetization | Free with in-app purchases | — |
| Devices | iPhone, iPod, Apple Watch — better | iPhone, iPod |
| Requires iOS | 26.0 | 13.0 — better |
| Further details — not scored | ||
| Size | 6 MB | 17 MB |
| Age rating | 4+ | 4+ |
| Developer | Gereon Steffens | Kastelo AB |
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)
Flaska
Not enough reviews yet to summarise bugs or requests.
In-app purchases
Nitrox Buddy
- Tip$0.99
Flaska
No in-app purchases
