Nitrox Buddy vs Kratos AI
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.
Kratos AI
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Train smarter. Get real results. Kratos is an all-in-one fitness platform designed for both coaches and clients. Whether you are following a training plan or managing dozens of athletes, everything you need is in one place. For Clients Take control of your training, nutrition, and progress. Follow structured workouts Complete your training plan, track sets and reps, and stay consistent. Track calories with AI Log meals from photos, voice, or text without manual tracking. Monitor your progress Track weight, performance, and long-term results. Stay connected with your coach Chat in real time and get feedback when you need it. Upload workout videos Record your exercises and improve your technique with expert feedback. For Coaches Run and scale your coaching business without extra tools or staff. Manage all your clients in one dashboard Oversee progress, workouts, and communication in one place. Scale your coaching Handle 50+ clients efficiently without needing a team. Review and give video feedback Watch client workouts and provide detailed guidance. Built-in messaging Stay in constant contact and keep clients accountable. Track client progress at scale Monitor results across all your athletes. Built for real results Kratos combines training, nutrition, communication, and coaching into one powerful system. No more switching between apps. No more guesswork. Just structure, accountability, and progress. Start training. Start coaching. Start improving.
Screenshots
Verdict
The clearest difference is in-app purchases: Kratos AI at none against Nitrox Buddy's 1. Kratos AI also leads on update cadence (every 3 days vs every 7 months) and iOS requirement (15.0 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. Kratos AI asks for nothing beyond the download.
Nitrox Buddy ships an update every 7 months, Kratos AI every 3 days. The most recent releases landed on October 24, 2026 and October 5, 2026 respectively.
| Parameter | Nitrox Buddy | Kratos AI |
|---|---|---|
| Price | Free | Free |
| Rating | 4.9 (490 ratings) — better | — |
| Positive reviews | 95.8% of reviews | — |
| Number of ratings | 490 — better | — |
| Update frequency | Every 7 months | Every 3 days — better |
| Ads | No | No |
| In-app purchases | Yes | No — better |
| Monetization | Free with in-app purchases | — |
| Devices | iPhone, Apple Watch | iPhone, iPad, iPod — better |
| Requires iOS | 26.0 | 15.0 — better |
| Further details — not scored | ||
| Size | 6 MB | 16 MB |
| Age rating | 4+ | 4+ |
| Developer | Gereon Steffens | Kratos AI |
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)
Kratos AI
Not enough reviews yet to summarise bugs or requests.
In-app purchases
Nitrox Buddy
- Tip$0.99
Kratos AI
No in-app purchases
Questions
Is Nitrox Buddy free?
Is Kratos AI free?
Do Nitrox Buddy or Kratos AI have ads?
Which is updated more often, Nitrox Buddy or Kratos AI?
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