Comparison

Diving Log vs Subsurface

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

Head to head
About

Diving Log

This app serves as a customizable digital logbook for scuba divers. It allows users to record detailed dive information, including depth, time, location, and environmental conditions. Users can also add photos, instructor signatures, and export logs for social sharing.

Highlights
  • Customizable dive logbook
  • Record dive details (depth, time, temp)
  • Map dive point locations
  • Add photos and instructor signatures
  • Export logs to social media
  • Graph display of depth intervals
Features
Read full description

TUSA Diving LOG is a diving logbook app, which enables you to upload log data from TUSA IQ1204 DC Solar Link to your smartphone using Bluetooth® SMART. The TUSA Diving LOG App has many customizable functions to record the details of your dive. Information such as entry time, exit time, dive time, maximum water depth, average water depth, water temperature, air consumption, and much more can be recorded. Customize your dive log by recording dive point locations using maps, add photos, and capture signatures from an instructor. In addition, detailed water depth and warning information can be recorded at intervals, and uploaded to your app. Also you can easily export dive log information as images to share on Facebook, Twitter, or other social media. TUSA Diving LOG can be used independently of TUSA IQ1204 DC Solar link to record basic log information. --TUSA Diving LOG-- • Featuring: - Customizable scuba diving log book (create, edit, and browse log history) - Graph display of depth intervals - Record dive point locations using maps - Export log information as an image to share on social media - Dive instructor verification signature - Ability to toggle ON/OFF all menu display items • Information Recording: - Maximum Water Depth (including graph display and current time) - Average Water Depth - Total Bottom Time (including Entry and Exit Time) - Date - Location - Dive Points (Map Display) - Entry Point (Boat or Beach) - Residual Pressure Start and End Time - Air Consumption - Weather - Wave Height - Current - Wind - Water Temperature - Lowest Water Temperature - Visibility - Gas Type - Cylinder Type & Volume - Safety Factors: N2 & O2 Indicators - Ascent Rate Warning - Decompression Dive Warning - Decompression Depth Warning - PO2 warning - O2 warning - Maximum Depth Alarm - M Value Warning - Weight - Instructors Name - Instructor Verification Signature - Buddy Name - Memo • Creating a New Dive Log with TUSA Diving LOG App - Press the “New Log” button on the home screen to create your new dive log. • How to Pair TUSA IQ1204 DC Solar Link with DiveLog App - When you create a new dive, first press the blue “Link with DC Solar” button on top in order to pair your TUSA IQ1204 DC Solar Link. Press the “Start Search” button displayed at the bottom of the screen. Make sure to follow all instructions on the screen in order to successfully upload your dive log information in the Diving LOG app.

About

Subsurface

This application allows divers to manage their dive logs on their mobile devices. It supports editing dive data and downloading new information from compatible dive computers. Optional cloud synchronization is available for seamless data transfer with desktop versions.

Highlights
  • Mobile dive log management
  • Edit dive data
  • Download from Bluetooth LE dive computers
  • Optional cloud synchronization
  • Open-source and free
Read full description

Subsurface-mobile is an iOS dive log application based on Subsurface, the best free open source dive log application available on Windows, Mac and Linux. Subsurface-mobile allows you to access your dive log on your tablet or phone, edit the data and even download new dive information from many Bluetooth LE enabled dive computers. Using a free Subsurface Cloud Storage account you can synchronize your dive data with the Subsurface desktop application (while significantly increasing the usefulness, the cloud account is not required to use Subsurface-mobile). To get support from the developers, please use the in-app menu entry "Ask for support" Please check out the Subsurface-mobile user manual: https://subsurface-divelog.org/documentation/subsurface-mobile-v3-user-manual (also available from within the app) Subsurface-mobile is free and open source. No ads, no commercial anything. And it comes with free cloud storage (if you decide to use that - it's optional). Your data aren't used for anything, nothing gets monetized.

Screenshots

Diving Log4 screens
Subsurface4 screens

Verdict

The call

The clearest difference is rating: Subsurface at 4.5 against Diving Log's 2.0. Subsurface also leads on update cadence (every 2 months vs every 9 months) and ratings volume (48 vs 3). On price, ads, in-app purchases and monetization model 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. Neither carries in-app purchases, so what you see is what you pay.

ReceptionRating · Positive reviews · Number of ratings

Subsurface holds the better App Store score, 4.5 against 2.0. That said, the two scores are not equally well evidenced: Subsurface has 48 ratings behind it against 3, so its average is the more settled of the two. Written reviews point the same way: 50% of Diving Log's written reviews are positive against 63% of Subsurface's.

UpkeepUpdate frequency

Diving Log ships an update every 9 months, Subsurface every 2 months. The most recent releases landed on September 21, 2026 and September 18, 2026 respectively.

Scorecard4 real differences · 6 level
Diving Log versus Subsurface: the parameters behind the verdict, then further details
ParameterDiving LogSubsurface
PriceFreeFree
Rating2.0 (3 ratings)4.5 (48 ratings) — better
Positive reviews50.0% of reviews63.3% of reviews — better
Number of ratings348 — better
Update frequencyEvery 9 monthsEvery 2 months — better
AdsNoNo
In-app purchasesNoNo
MonetizationFreeFree
DevicesiPhone, iPadiPhone, iPad
Requires iOS18.017 — better
Further details — not scored
Size22 MB52 MB
Age rating4+4+
DeveloperTABATA CO.,LTD.Dirk Hohndel

Customer experience

Diving Log

All ratings3 ratings
Positive33.3%
Neutral0.0%
Negative66.7%
Written reviews2 reviews
Positive50.0%
Neutral0.0%
Negative50.0%

Subsurface

All ratings48 ratings
Positive89.6%
Neutral2.1%
Negative8.3%
Written reviews30 reviews
Positive63.3%
Neutral6.7%
Negative30.0%

In-app purchases

None

Diving Log

No in-app purchases

None

Subsurface

No in-app purchases

Questions

Is Diving Log free?
Diving Log is free to download, with no in-app purchases.
Is Subsurface free?
Subsurface is free to download, with no in-app purchases.
Which has better reviews, Diving Log or Subsurface?
Subsurface is rated higher. Diving Log averages 2.0 out of 5 from 3 ratings, while Subsurface averages 4.5 from 48 ratings.
Do Diving Log or Subsurface have ads?
Neither Diving Log nor Subsurface shows ads.
Which is updated more often, Diving Log or Subsurface?
Diving Log ships an update every 9 months, and Subsurface every 2 months. Most recently, Diving Log was updated on September 21, 2026 and Subsurface on September 18, 2026.

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