# Halcyon Dive Systems vs Active Log

The clearest difference is in-app purchases: Halcyon Dive Systems at none against Active Log's 4. Halcyon Dive Systems also leads on ratings volume (8 vs 1). Active Log's advantage is update cadence (every 3 days vs every 2 weeks) and device support (3 vs 1). On price, rating, ads and iOS requirement there is nothing between them.

Both are free to download. Active Log sells 4 in-app purchases, starting at $4.99 per year. Halcyon Dive Systems asks for nothing beyond the download.

On the App Store both sit at effectively the same score — 5.0 for Halcyon Dive Systems against 5.0 for Active Log. That said, the two scores are not equally well evidenced: Halcyon Dive Systems has 8 ratings behind it against 1, so its average is the more settled of the two.

Halcyon Dive Systems ships an update every 2 weeks, Active Log every 3 days. The most recent releases landed on October 4, 2026 and October 10, 2026 respectively.

## The numbers

| Metric | Halcyon Dive Systems | Active Log |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [5.0 (8 ratings)](https://appshunter.io/ios/app/halcyon-dive-systems-diving/id6738069654/reviews) | [5.0 (1 ratings)](https://appshunter.io/ios/app/active-log/id6756741575/reviews) |
| Number of ratings | **8** | 1 |
| Positive reviews | — | 100.0% of reviews |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 2 weeks | **Every 3 days** |
| Monetization | **Ad-supported** | Free with in-app purchases |
| Size | 159 MB | 75 MB |
| Requires iOS | 16.0 | **15.6** |
| Devices | iPhone | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Halcyon Dive Systems](https://appshunter.io/developer/1779189368) | [Duong Do](https://appshunter.io/developer/1455884076) |

## What reviewers say

### Halcyon Dive Systems

[App page](https://appshunter.io/ios/app/halcyon-dive-systems-diving/id6738069654)

This app helps divers log, track, and share their underwater experiences. It offers integration with dive computers, personalized settings, and a community forum for connecting with other divers.

**Highlights:** Symbios integration for dive computer settings, Detailed dive logging and progress tracking, Social logbook for sharing dive stories, Connect with a global diving community, Personalized dive tips and advice, Exclusive benefits for Halcyon owners

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

**In-app purchases:** none


### Active Log

[App page](https://appshunter.io/ios/app/active-log/id6756741575)

This app serves as a comprehensive dive logbook for scuba and freediving enthusiasts. It allows users to track progress, plan dives, import data from dive computers and existing files, and store important documents. It also includes safety calculators and works offline.

**Highlights:** Dive computer data import, Log file import (SSRF, .FIT), Dive planning and profile tracking, Document and certification storage, Offline functionality, Safety calculators (MOD, EAD, ppO2), Cloud sync across devices

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

**In-app purchases (4)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Freediving module (yearly) | $4.99 | per year |
| TechDive module (yearly) | $4.99 | per year |
| Swimming module (yearly) | $4.99 | per year |
| Diving module (yearly) | $9.99 | per year |


## Frequently asked questions

### Is Halcyon Dive Systems free?

Halcyon Dive Systems is free to download, with no in-app purchases.

### Is Active Log free?

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

### Which has better reviews, Halcyon Dive Systems or Active Log?

Halcyon Dive Systems and Active Log are both rated 5.0 out of 5 on the App Store, from 8 and 1 ratings respectively.

### Do Halcyon Dive Systems or Active Log have ads?

Neither Halcyon Dive Systems nor Active Log shows ads.

### Which is updated more often, Halcyon Dive Systems or Active Log?

Halcyon Dive Systems ships an update every 2 weeks, and Active Log every 3 days. Most recently, Halcyon Dive Systems was updated on October 4, 2026 and Active Log on October 10, 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.*