Comparison

Gas*Blender vs Poseidon Reef

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

Head to head
About

Gas*Blender

Features
Read full description

GasBlender is helping you calculate which gasses you should dive with, few input fields and easy to read output for at better experience. GasBlender supports Best mix and MOD for both Nitrox and Trimix and continous blending Nitrox and Trimix. For more info see http://www.gasblender.dk Please send feedback and feature requests to feedback@gasblender.dk

About

Poseidon Reef

This app helps divers log, plan, and analyze their dives. It offers detailed overviews, customizable dive logs, and advanced planning for various dive types. Connect your dive computer to manage data and firmware.

Highlights
  • Comprehensive dive logging
  • Detailed dive planning
  • Support for OC and CCR dives
  • Unlimited tank support
  • Decompression model selection
  • Dive computer connectivity
  • Cloud backup and firmware updates
Read full description

Dive into the deep with Reef, the ultimate tool for every diver regardless of experience, level, or dive style. Designed to enhance and prolong your passion for diving, Reef seamlessly extends your diving experience, both before and after the actual dive. With Reef in your pocket, you're always ready to explore. Dive Log > Get a comprehensive and detailed overview of all your dives. > Easily sort and filter to find specific dives. > Import and export dives effortlessly. > Personalize dives with custom details, photos, location and more. > Engage with your dives using the interactive chart functionality. > Visualize intricate data like tank pressures, pO2, loop temperature, etc.* > Choose the data points you want to see > Zoom in on portions of the dive you are interested in Planner > Keep track of all your upcoming dives with a comprehensive overview. > Sort, filter, and organize your dive plans. > Plan for a single dive or a series of dives. > Suitable for OC (Open Circuit) and CCR (Closed Circuit Rebreather) dives. > Supports an unlimited number of tanks. > Choose between DCAP and Buhlmann decompression models. > Bailout scenario > Configure gas content Device Manager > Connect your Poseidon M28 dive computer through WiFi > View details about connected submodules. > Download, store, and back up your dives in the cloud. > Access vital service information > Monitor total dive time > Stay updated with firmware information. *Only available with Poseidon M28 dive computer

Screenshots

Gas*Blender4 screens
Poseidon Reef4 screens

Verdict

The call

The clearest difference is price: Poseidon Reef at Free against Gas*Blender's $2.99. Poseidon Reef also leads on update cadence (every 5 weeks vs every 3 months) and device support (4 vs 2). Gas*Blender's advantage is ads (none vs shown). On in-app purchases 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

Poseidon Reef is free to download; Gas*Blender costs $2.99 up front. Neither carries in-app purchases, so what you see is what you pay.

UpkeepUpdate frequency

Gas*Blender ships an update every 3 months, Poseidon Reef every 5 weeks. The most recent releases landed on November 10, 2026 and November 3, 2026 respectively.

Scorecard5 real differences · 5 level
Gas*Blender versus Poseidon Reef: the parameters behind the verdict, then further details
ParameterGas*BlenderPoseidon Reef
Price$2.99Free — better
Rating—3.0 (2 ratings) — better
Positive reviews—0.0% of reviews
Number of ratings—2 — better
Update frequencyEvery 3 monthsEvery 5 weeks — better
AdsNo — betterYes
In-app purchasesNoNo
Monetization—Ad-supported
DevicesiPhone, iPadiPhone, iPad, iPod, Mac — better
Requires iOS26.012.1 — better
Further details — not scored
Size4 MB58 MB
Age rating4+4+
DeveloperMartin SchythPoseidon Diving Systems AB

In-app purchases

None

Gas*Blender

No in-app purchases

None

Poseidon Reef

No in-app purchases

Questions

Is Gas*Blender free?
Gas*Blender costs $2.99, with no in-app purchases.
Is Poseidon Reef free?
Poseidon Reef is free to download, with no in-app purchases.
Do Gas*Blender or Poseidon Reef have ads?
Poseidon Reef shows ads; Gas*Blender does not.
Which is updated more often, Gas*Blender or Poseidon Reef?
Gas*Blender ships an update every 3 months, and Poseidon Reef every 5 weeks. Most recently, Gas*Blender was updated on November 10, 2026 and Poseidon Reef on November 3, 2026.

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