OSTConf vs BLUU divelog
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.
BLUU divelog
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Log key parameters and find past dives in seconds. Download dive parameters, including dive profiles, gas mixes and temperature from your Heinrichs-Weikamp OSTC dive computer. Add pictures to dive sites. Capture more in the notes section. Whatever it is you want to add, BLUU divelog has you covered. Ensure correct time and date on your Heinrichs-Weikamp dive computer - simply synchronise with your iPhone.
Screenshots
Verdict
The clearest difference is update cadence: BLUU divelog at every 2 months against OSTConf's every 5 months. On price, ads, in-app purchases and device support 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, BLUU divelog every 2 months. The most recent releases landed on September 19, 2026 and September 10, 2026 respectively.
| Parameter | OSTConf | BLUU divelog |
|---|---|---|
| Price | Free | Free |
| Positive reviews | 25.0% of reviews | — |
| Update frequency | Every 5 months | Every 2 months — better |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Free | — |
| Devices | iPhone, iPad, iPod — better | iPhone, iPod |
| Requires iOS | 16.0 | 15.0 — better |
| Further details — not scored | ||
| Size | 3 MB | 6 MB |
| Age rating | 4+ | 4+ |
| Developer | Kai-Uwe Sattler | Olaf Meincke |
In-app purchases
OSTConf
No in-app purchases
BLUU divelog
No in-app purchases
