Here is androidcommunity article
One side effect with us being eternally attached to our mobile devices is that more often than not, your smartphone or tablet will definitely overheat, particularly if you’re a heavy user (aren’t we all?). While you can’t use a cooling pad (yet) unlike with your netbooks or laptops, of course we expected that there will be an app for that. Coolify has one function only, and that is to ensure that your device will always be cool, literally.
Using the app isn’t that complicated since its functionality is very basic. Once you’ve installed it and opened it for the first time, it tells you how cool your device is (no, we don’t mean the cool factor but it’s actual temperature). It will then supposedly keep your device on normal temperature, specifically when you’re not using it or when you’re actually charging it. If you prefer to prettify it a bit, you can custom the background color of the app, but since you won’t be opening it often, then it doesn’t really matter.
The app doesn’t really say if it will keep your device cool when you’re actually using it, which might defeat its main purpose. Also, if your phone isn’t rooted, the “turn on normal temp protection” doesn’t really work and might just exist to tell you what the temperature of your device is. However, as it is “nearly transparent”, meaning you hardly notice it, and has almost zero CPU or battery consumption, it wouldn’t hurt to have it installed in your smartphone or tablet.
You can download the app for free from the Google Play Store. Or if you prefer the original version, you can get it from the developer’s site. VIA: XDA Developers
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