Comparison

Z dive log vs Thalos

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

Head to head
About

Z dive log

Easily manage your SCUBAPRO Z1 dive computer logs and settings. Download dive data via Bluetooth, add details like location and photos, and configure your dive computer's preferences.

Highlights
  • Download dive logs via Bluetooth
  • Enter and edit dive log details
  • Add photos to dive logs
  • View dive statistics at a glance
  • Configure Z1 dive computer settings
  • Save and share depth graph images
Read full description

With "Z dive log" and "SCUBAPRO Diving Computer Z1" you can enjoy diving log management and Z1 settings easily. You can download Z1's diving log data via Bluetooth and you can enter the diving point, weather etc on the smartphone. ● Download dive logs Tap the upper right "Download" button of Z dive log then set your Z1 to Bluetooth Mode "ON", Z dive log automatically start downloading dive logs. If the "Download button is not displayed, tap the "Dive Log" button at the bottom of the display. Downloaded logs are displayed in the Dive Log List and you can check log list by swiping. On the Dive Log List screen, you can check the total dive times, total dive time, maximum water depth and maximum dive time etc at a glance, and you can tap each log to see the details. - List of Z1 log items that can be downloaded by Z dive log Date Start time End time Depth Graph* Max. Depth Avg. Depth Max. Depth Temp O2 Indicator N2 Indicator Warnings * Depth graph is created automatically. ● Checking, entering, and correcting dive log details You can enter the log details when you tap each log from Dive Log List. You can fill in the same way as the paper log book, such as Location, Spot, photos, tanks, exposure protection, sea condition, buddy/instructor and comments. If you attach a photo, the photo will be displayed on the Dive Log List screen and you can enjoy a colorful logbook. You can put 3 photos, main photo, instructor photo and buddy photo in one log. - List of items that can be input / modified in Z dive log Location Location Spot Entry Dive Log Date Start time End time Depth Graph Max. Depth Avg. Depth Min Temp O2 Indicator N2 Indicator Warnings Photo Tank Tank Material Gas Tank Capacity Start Pressure End Pressure Exposure Protection Suit Glove Boot Hood Inner Weight Sea Condition Weather Temperature Surface Temperature Bottom Temperature Visibility Wave Height Current Surge Wind Direction Wind Speed Buddy/Instructor Instructor Instructor No. Instructor Photo Buddy Buddy Photo Comments ● Saving the Depth Graph Image Tap the image of the depth graph on the log detail screen to save the depth graph image. You can upload the saved image to SNS or check on the PC. ●Tap the "Z1 Setting Change" tab at the bottom of the screen. On the Z1 Setting Change screen, you can set Basic Configuration, Dive Setting, Alarm Setting, Timer Setting, Configuring Time and Date Settings and World Time. You can change the Z1 settings from Z dive log. Tap the "Reading" button at the top right of the screen and tap the CONNECT button. Set your Z1 to Bluetooth Mode and press PLAN button once to change Bluetooth state "ON". Starts connection and reads the Z1 settings. After reading, you can change Z1 settings from Z dive log. Change the item you want to change and tap the "Writing" button and set your Z1 to Bluetooth Mode "ON", the Z1 settings are changed. -Z dive log Setting · Support menu list App Settings App color scheme Restore deleted Dive Log Items of Log display Tank Exposure Protection Sea Condition Buddy/Instructor Photo Unit Depth Temperature Pressure Volume Weight Log Data Export About Z dive log Web manual Introducing app to friends Write a review on the app store ● Export Log data CSV Choose the Export menu from the Settings / Support menu. A confirmation message will be displayed. Save the CSV data to the destination you want to save. You can check the saved CSV data on the PC.

About

Thalos

This comprehensive dive app offers a robust dive logbook, detailed dive site information with emergency plans, and multiple dive calculators. It includes features for instructors to manage students and courses, and a social feed for divers to connect and share experiences. The app works fully offline, ensuring critical data is always accessible.

Highlights
  • Offline dive logbook
  • Dive site database with emergency plans
  • 9 essential dive calculators
  • Instructor module for course management
  • Social feed and community features
  • Emergency mode for critical access
Features
Read full description

Thalos is the all-in-one dive app built for serious divers and instructors. Whether you're planning a deep technical dive or running an open water course, Thalos has everything you need — and it works fully offline when it matters most. DIVE LOGBOOK Log every dive with depth, time, gas, conditions, marine life sightings, buddy signatures, and photos. Full version history keeps your records safe. Organize dives into trips and track your personal certifications. DIVE SITES & EMERGENCY PLANS Access 510+ dive sites with detailed emergency action plans, nearest hyperbaric chambers, and emergency contacts — all stored locally so they're available even without signal. 9 DIVE CALCULATORS • Bühlmann ZHL-16C decompression planner with gradient factors • Gas planner and gas blending • SAC rate, turn pressure, weight calculator • Dive tables, unit converter, altitude diving EMERGENCY MODE One tap gets you to emergency procedures and critical contacts. Works 100% offline. INSTRUCTOR MODULE Manage students, run courses with 26 built-in templates, track skill sign-offs, generate paperwork (liability waivers, medical forms, training dives), and issue certifications. SOCIAL FEED & TANK TAPS Share your dives, follow other divers, and give Tank Taps — the diver's way of saying nice dive. COMMUNITY Discover and post dive classes, trips, and dive centers. Instructors can manage enrollments directly in the app. SUBSCRIPTION Thalos requires a subscription after a 1-month free trial. $2.99/month or $19.99/year. Terms of Use: https://blackflagdivecenter.github.io/Thalos/terms.html Privacy Policy: https://blackflagdivecenter.github.io/Thalos/privacy.html

Screenshots

Z dive log4 screens
Thalos4 screens

Verdict

The call

The clearest difference is in-app purchases: Z dive log at none against Thalos's 2. Thalos's advantage is update cadence (daily vs every 4 months). On price, rating, ratings volume and ads 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. Thalos sells 2 in-app purchases, starting at $2.99 per month. Z dive log asks for nothing beyond the download.

ReceptionRating · Positive reviews · Number of ratings

On the App Store both sit at effectively the same score — 5.0 for Z dive log against 5.0 for Thalos. Both are backed by a comparable volume of ratings — 1 and 2 respectively.

UpkeepUpdate frequency

Z dive log ships an update every 4 months, Thalos daily. The most recent releases landed on October 6, 2026 and October 13, 2026 respectively.

Scorecard3 real differences · 7 level
Z dive log versus Thalos: the parameters behind the verdict, then further details
ParameterZ dive logThalos
PriceFreeFree
Rating5.0 (1 ratings)5.0 (2 ratings)
Positive reviews58.3% of reviews—
Number of ratings12 — better
Update frequencyEvery 4 monthsDaily — better
AdsNoNo
In-app purchasesNo — betterYes
MonetizationFree — betterSubscription
DevicesiPhoneiPhone, iPod — better
Requires iOS16.015.1 — better
Further details — not scored
Size40 MB41 MB
Age rating4+4+
DeveloperSCUBAPRO ASIA LTD.JOHN WALLIS YOUNGBLOOD

Customer experience

Z dive log

All ratings1 ratings
Positive100.0%
Neutral0.0%
Negative0.0%
Written reviews12 reviews
Positive58.3%
Neutral16.7%
Negative25.0%

Thalos

All ratings2 ratings
Positive100.0%
Neutral0.0%
Negative0.0%

In-app purchases

None

Z dive log

No in-app purchases

2 purchases

Thalos

Subscriptions2
  • Thalos1 Month trial$2.991 Month
  • Thalos1 Month trial$19.991 Year

Questions

Is Z dive log free?
Z dive log is free to download, with no in-app purchases.
Is Thalos free?
Thalos is free to download, with in-app purchases available.
Which has better reviews, Z dive log or Thalos?
Z dive log and Thalos are both rated 5.0 out of 5 on the App Store, from 1 and 2 ratings respectively.
Do Z dive log or Thalos have ads?
Neither Z dive log nor Thalos shows ads.
Which is updated more often, Z dive log or Thalos?
Z dive log ships an update every 4 months, and Thalos daily. Most recently, Z dive log was updated on October 6, 2026 and Thalos on October 13, 2026.

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