# Thalos vs Puffin

The clearest difference is in-app purchases: Puffin at none against Thalos's 2. Thalos's advantage is update cadence (daily vs every 3 weeks). On price, ads, device support and iOS requirement there is nothing between them.

Both are free to download. Thalos sells 2 in-app purchases, starting at $2.99 per month. Puffin asks for nothing beyond the download.

Thalos ships an update daily, Puffin every 3 weeks. The most recent releases landed on October 13, 2026 and October 24, 2026 respectively.

## The numbers

| Metric | Thalos | Puffin |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (2 ratings)](https://appshunter.io/ios/app/thalos/id6761337227/reviews)** | — |
| Number of ratings | **2** | — |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | **Daily** | Every 3 weeks |
| Monetization | Subscription | — |
| Size | 41 MB | 74 MB |
| Requires iOS | **15.1** | 16.4 |
| Devices | iPhone, iPod | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [JOHN WALLIS YOUNGBLOOD](https://appshunter.io/developer/1888980268) | [Robin Derrida](https://appshunter.io/developer/1436467730) |

## What reviewers say

### Thalos

[App page](https://appshunter.io/ios/app/thalos/id6761337227)

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:** macOS Compatibility, Vision Pro support

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Thalos | $2.99 | per month |
| Thalos | $19.99 | per year |


### Puffin

[App page](https://appshunter.io/ios/app/puffin-dive-log/id6774688885)

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

**In-app purchases:** none


## Frequently asked questions

### Is Thalos free?

Thalos is free to download, with in-app purchases available.

### Is Puffin free?

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

### Do Thalos or Puffin have ads?

Neither Thalos nor Puffin shows ads.

### Which is updated more often, Thalos or Puffin?

Thalos ships an update daily, and Puffin every 3 weeks. Most recently, Thalos was updated on October 13, 2026 and Puffin on October 24, 2026.

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