Nitrox Tools vs SUEX Calypso
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Nitrox Tools
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.
- 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
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Enriched Air Nitrox blending and planning tools in your hand and available at a touch. You can use these tools at your air station to provide the information you need to fill a Nitrox tank from any existing mix (or empty). Dive Planning tools provide your Equivalent Air Depth, PPO2 at your planned depth, Maximum & Contingency Operating Depth at various oxygen partial pressures and the "best mix" for a planned depth and oxygen partial pressure. You can easily switch between Metric and Imperial/U.S. systems of measurement to adapt to a new fill station. The dive planning tools also support both salt and fresh water calculations. Chances are you regularly work with a specific set of mixes and and common dive situations. Nitrox Tools includes the convenience of saved settings that you can recall at a touch and adjust to a new situation as needed. You can also select mix values using pre-installed default mixes or your own saved custom mixes. When updating one of the mixes for a tool you are offered a list of saved mixes that you can use directly or adjust as needed. You can save the currently displayed mix by clicking the "+" button. Just like with the saved calculations, you can re-arrange or delete any mixes in your saved list. Do you need to share your planning or blending calculations with other divers? All the tools have the ability to share the results of the calculations from within the application. You can set default email addresses and a subject within Nitrox Tool's settings that will be automatically added when you share a result. Nitrox Tools supports a number of blending methods: • Top Up - blend a final mix from starting mix and pressure using 100% oxygen and air or any available topping mix. • Bleed Down - save expensive oxygen and valuable time by easily calculating how much gas to bleed from an existing cylinder to switch to a different mix using air or any available topping mix. • Mix + Mix - make a specific final mix using the remaining gas in the cylinder and mixing that with banked Nitrox (rather than pure oxygen) and air or another topping mix. This enables the blending of Nitrox without the use of pure oxygen for certain combinations of mixes. Avoiding pure oxygen may increase the safety of the blending process and help manage the cost. • Top Off - determine the expected result from topping an existing cylinder with air or some other topping mix. This situation is common when a diver wants to have the blender top the mix remaining from the first dive with air from the boat's compressor. Remember you must always personally analyze your mix before diving it. This application is not a substitute for proper training and should not be used as a substitute for proper dive planning or the primary Nitrox blending and planning methods taught during training. Please do not attempt to handle high pressure oxygen or fill SCUBA cylinders without proper training.
SUEX Calypso
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.
- Connect with diving equipment
- Instant access to dive data
- Monitor equipment performance
- Configure dive parameters
- Enhance diving adventures
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This application has been developed to: - Stay connected with your Suex diving equipment - Have instant access to your essential data before and after the dive - Monitor the performance status of your Suex equipment - Configure the basic parameters before any dive - Have even more fun during your diving adventures
Screenshots
Verdict
The clearest difference is review sentiment: Nitrox Tools at 88% against SUEX Calypso's 0%. 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.
Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS
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 September 28, 2026 and September 3, 2026 respectively.
| Parameter | Nitrox Tools | SUEX Calypso |
|---|---|---|
| Price | $5.99 | Free — better |
| Rating | 5.0 (4 ratings) — better | — |
| Positive reviews | 88.5% of reviews — better | 0.0% of reviews |
| Number of ratings | 4 — better | — |
| Update frequency | Every 5 months | Every 3 months — better |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Paid | Free — better |
| Devices | iPhone, iPad, iPod, Mac — better | iPhone, iPad, iPod |
| Requires iOS | 15.6 | 15.6 |
| Further details — not scored | ||
| Size | 7 MB | 57 MB |
| Age rating | 4+ | 4+ |
| Developer | Greg Mclaughlin | SUEX SRL |
Customer experience
Nitrox Tools
SUEX Calypso
In-app purchases
Nitrox Tools
No in-app purchases
SUEX Calypso
No in-app purchases
Questions
Is Nitrox Tools free?
Is SUEX Calypso free?
Do Nitrox Tools or SUEX Calypso have ads?
Which is updated more often, Nitrox Tools or SUEX Calypso?
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