O'Dive vs Kalank
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
O'Dive
This app uses patented acoustic sensor technology to analyze gas microbubbles detected after a dive. It helps divers assess their decompression procedures and improve their safety and practice based on personalized acoustic measurements.
- Acoustic sensor technology
- Gas microbubble detection
- Personalized decompression analysis
- Diving practice improvement
- Diving safety enhancement
- Sensor control interface
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O'Dive's unique and patented technology includes an acoustic sensor connected to a smartphone app and a server with specialised analysis capabilities. O'Dive's objectives are: - Indicating to divers, by taking into consideration gas microbubbles detected, the adequation of their decompression procedures with their own person and diving practice; - Help them improve their practice and safety. The personalization of the diving procedure is based on the acoustic measurement of circulating gas microbubbles detected post-dive in the divers' venous system. O'Dive app allows to control the sensor by being the interface between the sensor, the server and the user. O'Dive is a technological innovation developped by AZOTH SYSTEMS.
Kalank
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Kalank is the next-generation dive logbook: record, import, book and share all your underwater activities: scuba diving, snorkeling, freediving... YOUR LOGBOOK, ALWAYS UP TO DATE Log every dive in seconds: location, depth, duration, conditions, gear… Your dives are numbered, organized and available anytime, even offline on the boat. IMPORT FROM YOUR DIVE COMPUTER Connect your dive computer via Bluetooth or import a file: your dives land in your logbook automatically, with all their data. No more manual entry. BOOK YOUR DIVES IN A FEW TAPS Find a dive center, pick your trip, course or gear, and book directly from the app — for yourself or for someone else. CATALOG YOUR SIGHTINGS Fish, turtles, nudibranchs… Record the species you encounter on every dive and build your own underwater encyclopedia. SHARE YOUR ADVENTURES Find your dive buddies, follow their trips and keep your passion alive beyond the water. Whether you're a beginner in training or an experienced diver, Kalank is with you before, during and after every dive. Download Kalank and dive into the adventure.
Screenshots
Verdict
The clearest difference is iOS requirement: O'Dive at 13.0 against Kalank's 15.0. On price, update cadence, ads and in-app purchases 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
Both are free to download. Neither carries in-app purchases, so what you see is what you pay.
O'Dive ships an update monthly, Kalank every 3 weeks. The most recent releases landed on June 4, 2026 and September 10, 2026 respectively.
| Parameter | O'Dive | Kalank |
|---|---|---|
| Price | Free | Free |
| Rating | 5.0 (1 ratings) — better | — |
| Positive reviews | 100.0% of reviews | — |
| Number of ratings | 1 — better | — |
| Update frequency | Monthly | Every 3 weeks — better |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Free | — |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Requires iOS | 13.0 — better | 15.0 |
| Further details — not scored | ||
| Size | 25 MB | 5 MB |
| Age rating | 4+ | 4+ |
| Developer | AZOTH SYSTEMS | Andrea Esposito |
In-app purchases
O'Dive
No in-app purchases
Kalank
No in-app purchases





