Nitrox Buddy vs nDeco
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.
nDeco
Plan multi-segment dives with ease using U.S. Navy and Bühlmann decompression models. Get instant dive information, depth limit guidance, and surface interval recommendations for safe underwater adventures.
- Multi-segment dive planning
- U.S. Navy & Bühlmann decompression models
- Depth limit guidance
- Instant dive information
- Surface interval recommendations
- Metric/imperial unit flexibility
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WHAT MAKES nDeco UNIQUE? * Simple and easy Dive Planning: Calculate multi-segment dive profiles * Safety First Approach: Built on U.S. Navy Diving Manual and Bühlmann ZH-L16 decompression models * Easy-to-Use Interface: Plan complex dives with just a few taps * Dynamic dive information * Easy to simulate multi segments dive scenarios KEY FEATURES: * Depth Limit Guidance: Safely plan dives from shallow reefs to deeper explorations * Multi-Segment Dive Planning: Create detailed dive profiles with multiple depth segments * Instant Dive Information: See total dive time, descent/ascent times, and surface intervals * Unit Flexibility: Switch between metric (meters) and imperial (feet) with one tap * Surface Interval Recommendations: Ensures safe intervals between multiple daily dives DESIGNED FOR DIVERS BY DIVERS for the recreational diver- nDeco provides the tools you need to plan safe, enjoyable underwater adventures. SAFETY DISCLAIMER: * Calibrated for sea-level, salt water diving * Designed for compressed air (21% oxygen) * Always dive within your training and certification limits DIVE SAFE. DIVE SMART. DIVE nDeco!
Screenshots
Verdict
The clearest difference is review sentiment: Nitrox Buddy at 96% against nDeco's 0%. Nitrox Buddy also leads on rating (4.9 vs 2.0) and ratings volume (468 vs 1). nDeco's advantage is in-app purchases (none vs 1) and iOS requirement (17.2 vs 26.0). On price, update cadence, 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. nDeco asks for nothing beyond the download.
Nitrox Buddy holds the better App Store score, 4.9 against 2.0. That said, the two scores are not equally well evidenced: Nitrox Buddy has 468 ratings behind it against 1, so its average is the more settled of the two. Written reviews point the same way: 96% of Nitrox Buddy's written reviews are positive against 0% of nDeco's.
Both ship on a similar rhythm, roughly every 7 months. The most recent releases landed on October 14, 2026 and September 27, 2026 respectively.
| Parameter | Nitrox Buddy | nDeco |
|---|---|---|
| Price | Free | Free |
| Rating | 4.9 (468 ratings) — better | 2.0 (1 ratings) |
| Positive reviews | 95.7% of reviews — better | 0.0% of reviews |
| Number of ratings | 468 — better | 1 |
| Update frequency | Every 7 months | Every 7 months |
| Ads | No | No |
| In-app purchases | Yes | No — better |
| Monetization | Free with in-app purchases | Free — better |
| Devices | iPhone, iPod, Apple Watch — better | iPhone, iPad |
| Requires iOS | 26.0 | 17.2 — better |
| Further details — not scored | ||
| Size | 6 MB | 73 MB |
| Age rating | 4+ | 4+ |
| Developer | Gereon Steffens | Eyal Vardi |
Customer experience
Nitrox Buddy
nDeco
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)
nDeco
Not enough reviews yet to summarise bugs or requests.
In-app purchases
Nitrox Buddy
- Tip$0.99
nDeco
No in-app purchases
