OSTConf vs Halcyon Dive Systems
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
OSTConf
Configure your dive computer settings and parameters wirelessly. Update date, time, custom text, gas mixes, and deco settings. Compatible with recent Bluetooth-enabled dive computers.
- Read and modify settings
- Update date and time
- Set custom text
- Configure gas mixes
- Set deco parameters
- Upgrade firmware
- Retrieve device information
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OSTConf is an application for configuring your OSTC dive computer. It allows you to read and modify settings and parameters of dive computers manufactured by heinrichs weikamp GmbH. Using Bluetooth LE technology, you can retrieve device information, update date and time, custom text, set up your gas mixes and deco parameters as well as upgrading the firmware. OSTConf is compatible with recent Bluetooth-capable OSTC dive computers such as OSTC 2, OSTC plus, OSTC sport, OSTC TR, and OSTC 4. Note that due to the iOS hardware only OSTC devices with BLE are supported. OSTC4: The firmware file contains up to three parts. Please start the firmware update multiple times to ensure that all parts are updated.
Halcyon Dive Systems
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.
- 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
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Explore without limits: Your Ultimate Diving App Dive smarter and safer with the Halcyon App. Enjoy this powerful tool for logging, tracking, and sharing all your diving experiences while experiencing unprecedented integration with your Halcyon computer. With the Haclyon app you have full control over all computer settings, allowing the creation of profiles that include tailored settings and gases, pushed to the computer with the click of a button. You can also enjoy a full-featured "dry-diving" mode to explore all the unique features of our Symbios-connected products. From beginners to seasoned pros, the Halcyon App empowers you to explore the underwater world with confidence, share with our vibrant community, and track your diving progress. Key Features: Symbios Integration: Sync with Symbios-enabled devices, including the Handset, HUD, Rebreather and more. Manage your settings, create saved profiles with tailored settings and gases, track dive profiles, and access advanced metrics. Log Your Dives: Keep a detailed record of your dives. Monitor your progress over time and relive your diving adventures. Social Logbook: Share your dive stories, photos, and achievements with divers worldwide. Stay motivated and inspire others along the way. Diving Community: Connect with divers at any level. Share tips, discover new dive spots, and stay in the loop with the latest dive trends. Personalized Dive Tips: Get advice tailored to your diving experience with helpful tips and tricks, no matter your skill level. Halcyon Owner Benefits: Enjoy exclusive perks if you're a Halcyon owner—priority support, extended warranties, and special offers to get the most out of your gear. Why Choose Halcyon App? The Halcyon App isn’t just for logging and tracking—it’s your gateway to a richer diving experience. With cutting-edge technology, a thriving community, and personalized insights, the Halcyon App helps you dive smarter, stay connected, and explore like never before. Whether you're diving at a technical site or simply enjoying a recreational dive, the app ensures every dive is memorable, safe, and exciting. Stay Connected, Stay Inspired Join a passionate diving community where you can share experiences, connect with fellow divers, and keep up with the latest Halcyon innovations. The Future of Diving Is Here With Symbios Ecosystem integration, the Halcyon App lets you customize and track your gear, log dives, and connect with divers worldwide. Experience the underwater world with the latest tools, all from your phone. For Divers at Every Stage Whether you're just starting out or have hundreds of dives under your belt, the Halcyon App helps you track your dives, manage your gear, and stay in touch with the diving community. Download Halcyon App Today Join the next generation of divers—download Halcyon App and start exploring without limits.
Screenshots
Verdict
The clearest difference is update cadence: Halcyon Dive Systems at every 3 weeks against OSTConf's every 5 months. OSTConf's advantage is monetization model (free vs ad-supported) and device support (3 vs 1). On price, ads, in-app purchases and iOS requirement there is nothing between them.
Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS
Both are free to download. Neither carries in-app purchases, so what you see is what you pay.
OSTConf ships an update every 5 months, Halcyon Dive Systems every 3 weeks. The most recent releases landed on November 2, 2026 and November 4, 2026 respectively.
| Parameter | OSTConf | Halcyon Dive Systems |
|---|---|---|
| Price | Free | Free |
| Rating | — | 5.0 (8 ratings) — better |
| Positive reviews | 25.0% of reviews | — |
| Number of ratings | — | 8 — better |
| Update frequency | Every 5 months | Every 3 weeks — better |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Free — better | Ad-supported |
| Devices | iPhone, iPad, iPod — better | iPhone |
| Requires iOS | 16.0 | 16.0 |
| Further details — not scored | ||
| Size | 3 MB | 162 MB |
| Age rating | 4+ | 4+ |
| Developer | Kai-Uwe Sattler | Halcyon Dive Systems |
Customer experience
OSTConf
Halcyon Dive Systems
In-app purchases
OSTConf
No in-app purchases
Halcyon Dive Systems
No in-app purchases
Questions
Is OSTConf free?
Is Halcyon Dive Systems free?
Do OSTConf or Halcyon Dive Systems have ads?
Which is updated more often, OSTConf or Halcyon Dive Systems?
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