Comparison

Nitrox Buddy vs Kratos AI

Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.

Head to head
About

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.

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
Read full description

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.

About

Kratos AI

Features
Read full description

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

Nitrox Buddy4 screens
Kratos AI4 screens

Verdict

The call

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

CostPrice · In-app purchases · Ads · Monetization

Both are free to download. Nitrox Buddy sells 1 one-off in-app purchase. Kratos AI asks for nothing beyond the download.

UpkeepUpdate frequency

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.

Scorecard3 real differences · 7 level
Nitrox Buddy versus Kratos AI: the parameters behind the verdict, then further details
ParameterNitrox BuddyKratos AI
PriceFreeFree
Rating4.9 (490 ratings) — better—
Positive reviews95.8% of reviews—
Number of ratings490 — better—
Update frequencyEvery 7 monthsEvery 3 days — better
AdsNoNo
In-app purchasesYesNo — better
MonetizationFree with in-app purchases—
DevicesiPhone, Apple WatchiPhone, iPad, iPod — better
Requires iOS26.015.0 — better
Further details — not scored
Size6 MB16 MB
Age rating4+4+
DeveloperGereon SteffensKratos 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

1 purchases

Nitrox Buddy

One-time1
  • Tip$0.99
None

Kratos AI

No in-app purchases

Questions

Is Nitrox Buddy free?
Nitrox Buddy is free to download, with in-app purchases available.
Is Kratos AI free?
Kratos AI is free to download, with no in-app purchases.
Do Nitrox Buddy or Kratos AI have ads?
Neither Nitrox Buddy nor Kratos AI shows ads.
Which is updated more often, Nitrox Buddy or Kratos AI?
Nitrox Buddy ships an update every 7 months, and Kratos AI every 3 days. Most recently, Nitrox Buddy was updated on October 24, 2026 and Kratos AI on October 5, 2026.

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