# Nitrox Tools vs SUEX Calypso

The clearest difference is review sentiment: Nitrox Tools at 88% against SUEX Calypso's 0%. Nitrox Tools also leads on chart position (#26 vs unranked). SUEX Calypso's advantage is price (Free vs $5.99). On update cadence, ads, in-app purchases and device support there is nothing between them.

SUEX Calypso is free to download; Nitrox Tools costs $5.99 up front. Neither carries in-app purchases, so what you see is what you pay.

Nitrox Tools ships an update every 5 months, SUEX Calypso every 3 months. The most recent releases landed on October 17, 2026 and October 4, 2026 respectively.

## The numbers

| Metric | Nitrox Tools | SUEX Calypso |
| --- | --- | --- |
| Price | $5.99 | **Free** |
| Rating | **[5.0 (4 ratings)](https://appshunter.io/ios/app/nitrox-tools/id284919980/reviews)** | — |
| Number of ratings | **4** | — |
| Positive reviews | **88.5% of reviews** | 0.0% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 5 months | **Every 3 months** |
| Monetization | Paid | **Free** |
| Best chart rank | **#26** | — |
| Size | 7 MB | 57 MB |
| Requires iOS | 15.6 | 15.6 |
| Devices | **iPhone, iPad, iPod, Mac** | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Greg Mclaughlin](https://appshunter.io/developer/284919983) | [SUEX SRL](https://appshunter.io/developer/1478705851) |

## What reviewers say

### Nitrox Tools

[App page](https://appshunter.io/ios/app/nitrox-tools/id284919980)

**Currently charting:** #26 Top Paid · Sports (US App Store)

This app provides essential tools for divers to plan and blend enriched air nitrox. It calculates dive parameters like equivalent air depth and maximum operating depth, and supports various blending methods for custom gas mixes. Easily switch between metric and imperial units and save custom settings for frequent use.

**Highlights:** Enriched air nitrox blending, Dive planning calculations, Equivalent Air Depth (EAD), Partial Pressure of Oxygen (PPO2), Maximum Operating Depth (MOD), Save custom mixes and settings, Metric/Imperial unit switching

**Features:** Vision Pro support

**In-app purchases:** none


### SUEX Calypso

[App page](https://appshunter.io/ios/app/suex-calypso/id1478705852)

Connect with your diving equipment to access essential data before and after dives. Monitor equipment performance and configure parameters for a more enjoyable underwater experience.

**Highlights:** Connect with diving equipment, Instant access to dive data, Monitor equipment performance, Configure dive parameters, Enhance diving adventures

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases:** none


## Frequently asked questions

### Is Nitrox Tools free?

Nitrox Tools costs $5.99, with no in-app purchases.

### Is SUEX Calypso free?

SUEX Calypso is free to download, with no in-app purchases.

### Do Nitrox Tools or SUEX Calypso have ads?

Neither Nitrox Tools nor SUEX Calypso shows ads.

### Which is updated more often, Nitrox Tools or SUEX Calypso?

Nitrox Tools ships an update every 5 months, and SUEX Calypso every 3 months. Most recently, Nitrox Tools was updated on October 17, 2026 and SUEX Calypso on October 4, 2026.

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