Comparison

Dive Log vs Gas Blender Toolkit

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

Head to head
About

Dive Log

Log your SCUBA dives with detailed information, including GPS coordinates and dive buddy details. Supports metric and imperial units, and integrates with desktop software for comprehensive dive history management.

Highlights
  • SCUBA diving logbook
  • GPS coordinate capture
  • Dive buddy integration
  • Dive data and statistics
  • Metric and Imperial units
  • Dive computer data import
  • Bluetooth LE transfer
Features
Read full description

Dive Log is designed to work either as your primary SCUBA diving logbook application or in conjunction with compatible 3rd party desktop logbook applications. You can use Dive Log at the dive site or on the dive boat to capture the information about the site while it is fresh in your mind (or your dive guide's mind). You can even capture the GPS coordinates of the dive site using the built in location services of your iOS device. Details about your actual dive can be added immediately after your dive or at the après dive event and later be saved to your desktop computer. The dive buddy feature is fully integrated with Contacts on your iPhone or iPad, letting you capture information about your newest dive buddy or quickly add an existing buddy to a particular dive. The dive data and statistics features let you have an immediate answer the next time your dive guide asks how much weight you used on your last dive or have all the information you need about your dive history when you fill out that next dive waiver. Metric and Imperial values are supported for all appropriate logbook fields. You can easily enter values using the appropriate units for the situation and view them in your preferred measurement system. You can even explore detailed dive profiles from popular dive computers that you download with your desktop software and later upload to Dive Log on iPhone/iPad. Dive profile data can also be transferred directly from certain dive computers directly via Bluetooth or using a supported Bluetooth accessory and an associated in-app purchase. On Windows, Diving Log 6.0 (www.divinglog.de) is fully integrated with Dive Log on iPhone/iPad and has built in synchronization. Diving Log 6.0 has extensive support for importing data from dive computers and other dive log applications. On Mac OS X, logbook information can be imported to Dive Log on iPhone/iPad from a number of compatible applications using the free Dive Log Manager application available from More Mobile Software (www.moremobilesoftware.com/divelog-sync). DiveLogDT (available on the Mac App Store) can be used to directly import a number of dive computers and file formats and can synchronize with Dive Log on iOS. Dive data can be directly downloaded on a Bluetooth LE (Bluetooth 4.0/5.0) compatible iPhone, iPad or iPod touch from Bluetooth LE capable dive computers such as the Suunto EON Steel, Suunto EON Core, Suunto D5, Scubapro Galileo 2 (G2), Aladin Sport (Matrix), Aladin H (Matrix), G2 HUD, Aladin A1, Shearwater Teric, Peregrine, Petrel 2, Petrel 3, Perdix, Perdix AI, Perdix 2, NERD 2, Oceanic VTX, Pro Plus 4, Geo 4.0, VEO 4.0, Aeris A300CS, Aqualung i300C, i330R, i550C, i750TC, i770R, Apeks DSX, Sherwood Wisdom 4, Mares Genius and certain heinrichs weikamp OSTC computers as well as the DiveNav Inc. bluebuddy and Tech Buddy dive logger accessories. Supported Bluetooth LE accessories are available separately. Mares Bluelink Pro is a Bluetooth LE accessory by Mares and available for purchase separately (www.mares.com). The Bluelink Pro allows you transfer dive data from certain Mares dive computers (Puck Pro, Smart, Smart Air, Quad and Quad Air) directly to Dive Log on your Bluetooth LE compatible iPhone, iPad or iPod touch. Dive Computer Buddy (aka DCbuddy) is a Bluetooth LE accessory by DiveNav Inc. (note that the DCbuddy itself is no longer available). The DCbuddy allows you transfer dive data from certain dive computers (including models from Suunto, Oceanic, Aqualung, Aeris, Sherwood, Tusa and Mares) directly to Dive Log on your Bluetooth LE compatible iPhone, iPad or iPod touch.

About

Gas Blender Toolkit

This comprehensive toolkit assists scuba divers in calculating and blending various gas mixtures like trimix, nitrox, and heliox. It offers features for both partial pressure and continuous blending, cost calculation, and utilizes ideal and real gas models for accuracy. Optimized for larger screens, it serves as a successor to a previous diving application.

Highlights
  • Partial pressure blending
  • Continuous blending
  • Trimix, nitrox, heliox calculations
  • Ideal and real gas models
  • Cost calculation
  • Top off from storage
Features
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Gas Blender Toolkit is a comprehensive, purpose-built calculator for technical and recreational scuba divers who blend their own breathing gases. FUNCTIONS • Partial-pressure gas blending with freely configurable fill order • Continuous / delta-gas blending method • Decanting from a storage bank, with calculation of the number of possible fills • MOD / END tables for standard scuba gases • pSCR loop oxygen-reduction calculation at constant volume ratio • CCR rebreather diluent END calculator for any depth and chosen PPO2 setpoint FEATURES • Real gas (Van der Waals) or ideal gas calculations • Cost calculation for each gas fill • Fully customizable standard gas list • Accounts for gas heating during filling • Clean, fast and easy to use • Available in English, German, Russian and Spanish Gas Blender Toolkit is the completely rewritten successor to the DIR-Wetnotes app, redesigned from the ground

Screenshots

Dive Log4 screens
Gas Blender Toolkit4 screens

Verdict

The call

The clearest difference is price: Gas Blender Toolkit at $2.99 against Dive Log's $14.99. Gas Blender Toolkit also leads on in-app purchases (none vs 10) and update cadence (every 9 days vs monthly). Dive Log's advantage is rating (4.7 vs 3.0) and review sentiment (84% vs 60%). On ads, device support and iOS requirement 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

Dive Log costs $14.99 and Gas Blender Toolkit $2.99 up front. Dive Log sells 10 one-off in-app purchases. Gas Blender Toolkit asks for nothing beyond the download.

ReceptionRating · Positive reviews · Number of ratings

Dive Log holds the better App Store score, 4.7 against 3.0. That said, the two scores are not equally well evidenced: Dive Log has 107 ratings behind it against 2, so its average is the more settled of the two. Written reviews point the same way: 84% of Dive Log's written reviews are positive against 60% of Gas Blender Toolkit's.

UpkeepUpdate frequency

Dive Log ships an update monthly, Gas Blender Toolkit every 9 days. Both last shipped on November 6, 2026.

Scorecard7 real differences · 3 level
Dive Log versus Gas Blender Toolkit: the parameters behind the verdict, then further details
ParameterDive LogGas Blender Toolkit
Price$14.99$2.99 — better
Rating4.7 (107 ratings) — better3.0 (2 ratings)
Positive reviews84.0% of reviews — better60.0% of reviews
Number of ratings107 — better2
Update frequencyMonthlyEvery 9 days — better
AdsNoNo
In-app purchasesYesNo — better
MonetizationFree with in-app purchases — betterPaid
DevicesiPhone, iPad, iPodiPhone, iPad, iPod
Requires iOS15.015.0
Further details — not scored
Size33 MB3 MB
Age rating4+4+
DeveloperGreg MclaughlinOleg Gurevich

Customer experience

Dive Log

All ratings106 ratings
Positive94.3%
Neutral2.8%
Negative2.8%
Written reviews307 reviews
Positive84.0%
Neutral6.5%
Negative9.4%

Gas Blender Toolkit

All ratings2 ratings
Positive50.0%
Neutral0.0%
Negative50.0%
Written reviews5 reviews
Positive60.0%
Neutral20.0%
Negative20.0%

In-app purchases

10 purchases

Dive Log

One-time10
  • Suunto Bluetooth Download$2.99
  • Mares Bluetooth Download$2.99
  • Shearwater Download$2.99
Show 7 more
  • bluebuddy Download$2.99
  • SCUBAPRO Download$2.99
  • Pelagic Bluetooth Download$2.99
  • Cressi Bluetooth Download$2.99
  • Ratio Bluetooth Download$2.99
  • Halcyon Bluetooth Download$2.99
  • DCbuddy Support$4.99
None

Gas Blender Toolkit

No in-app purchases

Questions

Is Dive Log free?
Dive Log costs $14.99, and also offers in-app purchases.
Is Gas Blender Toolkit free?
Gas Blender Toolkit costs $2.99, with no in-app purchases.
Which has better reviews, Dive Log or Gas Blender Toolkit?
Dive Log is rated higher. Dive Log averages 4.7 out of 5 from 107 ratings, while Gas Blender Toolkit averages 3.0 from 2 ratings.
Do Dive Log or Gas Blender Toolkit have ads?
Neither Dive Log nor Gas Blender Toolkit shows ads.
Which is updated more often, Dive Log or Gas Blender Toolkit?
Dive Log ships an update monthly, and Gas Blender Toolkit every 9 days. Most recently, Dive Log was updated on November 6, 2026 and Gas Blender Toolkit on November 6, 2026.

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