# O'Dive vs Kalank

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.

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.

## The numbers

| Metric | O'Dive | Kalank |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (1 ratings)](https://appshunter.io/ios/app/odive/id1534593720/reviews)** | — |
| Number of ratings | **1** | — |
| Positive reviews | 100.0% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Monthly | **Every 3 weeks** |
| Monetization | Free | — |
| Size | 25 MB | 5 MB |
| Requires iOS | **13.0** | 15.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [AZOTH SYSTEMS](https://appshunter.io/developer/1534593722) | [Andrea Esposito](https://appshunter.io/developer/1694229794) |

## What reviewers say

### O'Dive

[App page](https://appshunter.io/ios/app/odive/id1534593720)

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.

**Highlights:** Acoustic sensor technology, Gas microbubble detection, Personalized decompression analysis, Diving practice improvement, Diving safety enhancement, Sensor control interface

**In-app purchases:** none


### Kalank

[App page](https://appshunter.io/ios/app/kalank/id6504138946)

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases:** none


## Frequently asked questions

### Is O'Dive free?

O'Dive is free to download, with no in-app purchases.

### Is Kalank free?

Kalank is free to download, with no in-app purchases.

### Do O'Dive or Kalank have ads?

Neither O'Dive nor Kalank shows ads.

### Which is updated more often, O'Dive or Kalank?

O'Dive ships an update monthly, and Kalank every 3 weeks. Most recently, O'Dive was updated on June 4, 2026 and Kalank on September 10, 2026.

---

*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*