# Baltic Deco Planner vs Halcyon Dive Systems

The clearest difference is price: Halcyon Dive Systems at Free against Baltic Deco Planner's $18.99. Halcyon Dive Systems also leads on rating (5.0 vs 4.7) and update cadence (every 3 weeks vs every 2 months). Baltic Deco Planner's advantage is chart position (#171 vs unranked) and ratings volume (49 vs 8). On ads, in-app purchases and device support there is nothing between them.

Halcyon Dive Systems is free to download; Baltic Deco Planner costs $18.99 up front. Neither carries in-app purchases, so what you see is what you pay.

Halcyon Dive Systems holds the better App Store score, 5.0 against 4.7. That said, the two scores are not equally well evidenced: Baltic Deco Planner has 49 ratings behind it against 8, so its average is the more settled of the two.

Baltic Deco Planner ships an update every 2 months, Halcyon Dive Systems every 3 weeks. The most recent releases landed on October 24, 2026 and October 21, 2026 respectively.

## The numbers

| Metric | Baltic Deco Planner | Halcyon Dive Systems |
| --- | --- | --- |
| Price | $18.99 | **Free** |
| Rating | [4.7 (49 ratings)](https://appshunter.io/ios/app/baltic-deco-planner/id304464483/reviews) | **[5.0 (8 ratings)](https://appshunter.io/ios/app/halcyon-dive-systems-diving/id6738069654/reviews)** |
| Number of ratings | **49** | 8 |
| Positive reviews | 91.3% 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 | **#171** | — |
| Size | 4 MB | 162 MB |
| Requires iOS | **11.0** | 16.0 |
| Devices | **iPhone, iPod** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [Eskil Olsen](https://appshunter.io/developer/304464486) | [Halcyon Dive Systems](https://appshunter.io/developer/1779189368) |

## What reviewers say

### Baltic Deco Planner

[App page](https://appshunter.io/ios/app/baltic-deco-planner/id304464483)

**Currently charting:** #171 Top Paid · Sports (US App Store)

Plan complex technical dives with support for various breathing apparatus and gas mixes. Features advanced decompression algorithms, gas consumption tracking, and contingency profile planning. Easily store, export, and reuse dive plans.

**Highlights:** Decompression dive planning, Open circuit and rebreather support, Multi-level and repetitive dive support, Gas consumption and OTU/CNS tracking, Contingency profile planning, VPM-B and ZHL16-B algorithms, Dive plan storage and export

**Features:** macOS Compatibility

**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 Baltic Deco Planner free?

Baltic Deco Planner costs $18.99, 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, Baltic Deco Planner or Halcyon Dive Systems?

Halcyon Dive Systems is rated higher. Baltic Deco Planner averages 4.7 out of 5 from 49 ratings, while Halcyon Dive Systems averages 5.0 from 8 ratings.

### Do Baltic Deco Planner or Halcyon Dive Systems have ads?

Neither Baltic Deco Planner nor Halcyon Dive Systems shows ads.

### Which is updated more often, Baltic Deco Planner or Halcyon Dive Systems?

Baltic Deco Planner ships an update every 2 months, and Halcyon Dive Systems every 3 weeks. Most recently, Baltic Deco Planner was updated on October 24, 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.*