# Abysner vs Halcyon Dive Systems

The clearest difference is price: Halcyon Dive Systems at Free against Abysner's $2.99. Halcyon Dive Systems also leads on update cadence (every 3 weeks vs every 2 months) and ratings volume (8 vs 2). Abysner's advantage is chart position (#184 vs unranked) and device support (3 vs 1). On rating, ads, in-app purchases and iOS requirement there is nothing between them.

Halcyon Dive Systems is free to download; Abysner costs $2.99 up front. Neither carries in-app purchases, so what you see is what you pay.

On the App Store both sit at effectively the same score — 5.0 for Abysner against 5.0 for Halcyon Dive Systems. Both are backed by a comparable volume of ratings — 2 and 8 respectively.

Abysner ships an update every 2 months, Halcyon Dive Systems every 3 weeks. The most recent releases landed on October 27, 2026 and October 21, 2026 respectively.

## The numbers

| Metric | Abysner | Halcyon Dive Systems |
| --- | --- | --- |
| Price | $2.99 | **Free** |
| Rating | [5.0 (2 ratings)](https://appshunter.io/ios/app/abysner/id6636477320/reviews) | [5.0 (8 ratings)](https://appshunter.io/ios/app/halcyon-dive-systems-diving/id6738069654/reviews) |
| Number of ratings | 2 | **8** |
| Positive reviews | 100.0% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 2 months | **Every 3 weeks** |
| Monetization | Paid | **Ad-supported** |
| Best chart rank | **#184** | — |
| Size | 42 MB | 162 MB |
| Requires iOS | **15.3** | 16.0 |
| Devices | **iPhone, iPad, iPod** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [Roelof Rene Smit](https://appshunter.io/developer/1762786000) | [Halcyon Dive Systems](https://appshunter.io/developer/1779189368) |

## What reviewers say

### Abysner

[App page](https://appshunter.io/ios/app/abysner/id6636477320)

**Currently charting:** #184 Top Paid · Sports (US App Store)

This app is an open-source dive planning tool designed for simplicity and ease of use. It supports various gas mixes and decompression models, allowing for accurate planning of technical and recreational dives. Its intuitive interface makes it suitable for use even in challenging conditions.

**Highlights:** Buhlmann ZHL-16 A, B, C models, Multi-gas support (Air, Nitrox, Trimix, etc.), OTU and CNS tracking, Customizable environmental settings, Intuitive gas picker, Automatic contingency plans, Multi-level dive planning

**In-app purchases:** none


### 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


## Frequently asked questions

### Is Abysner free?

Abysner costs $2.99, with no in-app purchases.

### Is Halcyon Dive Systems free?

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

### Which has better reviews, Abysner or Halcyon Dive Systems?

Abysner and Halcyon Dive Systems are both rated 5.0 out of 5 on the App Store, from 2 and 8 ratings respectively.

### Do Abysner or Halcyon Dive Systems have ads?

Neither Abysner nor Halcyon Dive Systems shows ads.

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

Abysner ships an update every 2 months, and Halcyon Dive Systems every 3 weeks. Most recently, Abysner was updated on October 27, 2026 and Halcyon Dive Systems on October 21, 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.*