BlueOpen vs KRAT
Price, ratings, monetisation and update history for both apps, side by side โ with what reviewers say about each.
BlueOpen
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BlueOpen is the perfect solution to upgrade your existing doors. With almost no installation required and a very easy to use application, it is the best option to upgrade an automatic garage door to the new connected world. It also allows you to manage pedestrian doors. Blueopen is a complete solution that allows you to manage your doors using Bluetooth, so get rid of the Internet dependence. But also, if you want to control your doors from anywhere in the world, you can use it to control your doors using your home Internet connection. Including up to three different devices and a very nice and simple application, it is perfect to upgrade your existing doors to the next level. We are thinking about your garage or pedestrian door, but as far as you can connect it to any device, you can control that device. Blue Opener is a small device perfect for your existing automatic garage door. It is very easy to install and so small you can hide it almost everywhere. You just need to make sure your control panel has an option to be controlled by an external device through the use of two wires. If your control panel can also power an external device, then you are ready to go. Blue OpenHand is a cylinder ready to be used in most of the european pedestrian doors. Blue OpenWay is a gateway in charge of extending the Bluetooth control of your doors to anywhere in the world. It connects both to your home WiFi and your Bluetooth devices (Blue Opener, Blue OpenHand) allowing you to control them from anywhere at anytime. The application supports up to 7 users, one admin and six regular users, all of them able to open the doors. You can control as many doors as you want and you can even share some of them with some users and other doors with other different users.
KRAT
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Realize interaction between mobile phones and smart locks through Bluetooth.
Screenshots
Verdict
The clearest difference is update cadence: KRAT at monthly against BlueOpen's every 4 months. On price, ads, in-app purchases and device support there is nothing between them.
Scored on Price ยท Rating ยท Positive reviews ยท Number of ratings ยท Update frequency ยท Ads ยท In-app purchases ยท Monetization ยท Best chart rank ยท Devices ยท Requires iOS
Both are free to download. Neither carries in-app purchases, so what you see is what you pay.
BlueOpen ships an update every 4 months, KRAT monthly. The most recent releases landed on September 20, 2026 and May 17, 2026 respectively.
| Parameter | BlueOpen | KRAT |
|---|---|---|
| Price | Free | Free |
| Update frequency | Every 4 months | Monthly โ better |
| Ads | No | No |
| In-app purchases | No | No |
| Devices | iPhone, iPod | iPhone, iPod |
| Requires iOS | 12.0 โ better | 13.0 |
| Further details โ not scored | ||
| Size | 38 MB | 42 MB |
| Age rating | 4+ | 4+ |
| Developer | JCM Technologies S.A. | ้ ็ |
In-app purchases
BlueOpen
No in-app purchases
KRAT
No in-app purchases








