Thalos
Professional Dive Tools
Only for iPhone
Free · In‑App Purchases · Designed for iPhone. Not verified for macOS.
iPhone
Everything a diver needs. In one app.
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
Ratings & Reviews
Bug Fixes
The developer, JOHN WALLIS YOUNGBLOOD, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy .
Data Linked to You
The following data may be collected and linked to your identity:
- Contact Info
- User Content
- Identifiers
Accessibility
The developer has not yet indicated which accessibility features this app supports. Learn More
Information
- Seller
- JOHN WALLIS YOUNGBLOOD
- Size
- 42.9 MB
- Category
- Sports
- Compatibility
Requires iOS 15.1 or later.
- iPhone
Requires iOS 15.1 or later. - iPod touch
Requires iOS 15.1 or later. - Mac
Requires macOS 12.0 or later and a Mac with Apple M1 chip or later. - Apple Vision
Requires visionOS 1.0 or later.
- iPhone
- Languages
- English
- Age Rating
4+
- 4+
- In-App Purchases
Yes
- Thalos $19.99
- Thalos $2.99
- Copyright
- © 2026 John Youngblood