Comparison

Subsurface vs Scuba Diving Logbook Octologs

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

Head to head
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.

About

Scuba Diving Logbook Octologs

Log your scuba diving adventures with detailed stats, photos, and dive buddy connections. Explore your dive history on a global map and analyze performance with advanced analytics. Works offline and syncs automatically.

Highlights
  • Complete dive logging with GPS and depth profiles
  • Advanced dive analytics and performance tracking
  • Dive buddy network and in-app messaging
  • Visual dive mapping on an interactive world map
  • Offline functionality with automatic sync
  • GDPR-compliant cloud storage and backups
Features
Read full description

The ultimate scuba diving logbook and dive tracker for PADI, SSI, NAUI, and CMAS certified divers. Log every underwater adventure, analyze diving stats, and connect with your dive buddy community. Join thousands of divers who trust Octologs as their comprehensive diving logbook tracker. Transform how you log, chart, and share your scuba diving journey with powerful analytics and seamless dive buddy connections. COMPLETE DIVE LOGGING Record every detail including GPS coordinates, depth profiles, bottom time, SAC rate calculations, water temperature, visibility, and equipment used. Add photos and personal notes to preserve every underwater moment. Works offline at remote dive sites with automatic sync when connected. POWERFUL DIVE ANALYTICS Monitor your scuba diving performance with detailed stat tracking including SAC rate analysis, air consumption charts, and depth versus time profiles. Track progress with our achievement system and see your underwater evolution over time. DIVE BUDDY NETWORK Expand your diving community by scanning QR codes to instantly connect with dive buddies. Share dive logs, plan underwater adventures together, and stay connected through in-app messaging. Create stunning dive cards perfect for social sharing. VISUAL DIVE MAPPING Chart your global diving story on an interactive underwater world map. Every logged dive becomes a pin on your personal diving chart, making it easy to revisit favorite sites and plan new scuba adventures. SECURE AND RELIABLE Your diving logbook history is protected with GDPR-compliant cloud storage and automatic backups. Sign in with Apple or Google for secure access across all your devices. MULTILINGUAL DIVING SUPPORT Available in 17 languages including English, German, French, Spanish, Portuguese, Italian, Greek, Arabic, Hindi, Japanese, Korean, Russian, Turkish, Vietnamese, Chinese, Javanese, and Slovenian. PRO DIVING FEATURES Unlock advanced scuba diving analytics with detailed stat tracking and performance charts. Upload up to 20 photos per dive log versus 1 photo on the free plan. Connect with unlimited dive buddies per dive log and chat with your diving community through in-app messaging. Start with a 14-day free trial to experience everything Octologs Pro offers for scuba divers. Whether you're logging your first open water dive or your thousandth technical dive, this diving logbook tracker adapts to your underwater needs. Download now and revolutionize how you document your scuba diving world.

Screenshots

Subsurface4 screens
Scuba Diving Logbook Octologs4 screens

Verdict

The call

The clearest difference is in-app purchases: Subsurface at none against Scuba Diving Logbook Octologs's 4. Subsurface also leads on ratings volume (48 vs 4). Scuba Diving Logbook Octologs's advantage is rating (4.8 vs 4.5). On price, update cadence, ads 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

CostPrice · In-app purchases · Ads · Monetization

Both are free to download. Scuba Diving Logbook Octologs sells 4 in-app purchases, starting at $1.00 per month. Subsurface asks for nothing beyond the download.

ReceptionRating · Positive reviews · Number of ratings

Scuba Diving Logbook Octologs holds the better App Store score, 4.8 against 4.5. That said, the two scores are not equally well evidenced: Subsurface has 48 ratings behind it against 4, so its average is the more settled of the two.

UpkeepUpdate frequency

Subsurface ships an update every 2 months, Scuba Diving Logbook Octologs every 5 weeks. The most recent releases landed on November 2, 2026 and November 3, 2026 respectively.

Scorecard4 real differences · 6 level
Subsurface versus Scuba Diving Logbook Octologs: the parameters behind the verdict, then further details
ParameterSubsurfaceScuba Diving Logbook Octologs
PriceFreeFree
Rating4.5 (48 ratings)4.8 (4 ratings) — better
Positive reviews63.3% of reviews—
Number of ratings48 — better4
Update frequencyEvery 2 monthsEvery 5 weeks — better
AdsNoNo
In-app purchasesNo — betterYes
MonetizationFree — betterFreemium
DevicesiPhone, iPadiPhone, iPod
Requires iOS1716.0 — better
Further details — not scored
Size52 MB88 MB
Age rating4+4+
DeveloperDirk HohndelBENJAMIN MAHR

Customer experience

Subsurface

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

Scuba Diving Logbook Octologs

All ratings4 ratings
Positive100.0%
Neutral0.0%
Negative0.0%

In-app purchases

None

Subsurface

No in-app purchases

4 purchases

Scuba Diving Logbook Octologs

Subscriptions3
  • Pro Subscription14 Days trial$1.001 Month
  • Pro Subscription$4.001 Month
  • Pro Subscription14 Days trial$10.001 Year
One-time1
  • 100 logbook entries$10.00

Questions

Is Subsurface free?
Subsurface is free to download, with no in-app purchases.
Is Scuba Diving Logbook Octologs free?
Scuba Diving Logbook Octologs is free to download, with in-app purchases available.
Which has better reviews, Subsurface or Scuba Diving Logbook Octologs?
Scuba Diving Logbook Octologs is rated higher. Subsurface averages 4.5 out of 5 from 48 ratings, while Scuba Diving Logbook Octologs averages 4.8 from 4 ratings.
Do Subsurface or Scuba Diving Logbook Octologs have ads?
Neither Subsurface nor Scuba Diving Logbook Octologs shows ads.
Which is updated more often, Subsurface or Scuba Diving Logbook Octologs?
Subsurface ships an update every 2 months, and Scuba Diving Logbook Octologs every 5 weeks. Most recently, Subsurface was updated on November 2, 2026 and Scuba Diving Logbook Octologs on November 3, 2026.

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