SuperFreezZ: App stopper is a app manager application developed by F-Droid Open Source, packaged as a single Android APK of version 0.2 weighing in at 2.36 MB. The package targets Android 4.1+ and above. Below you'll find the publisher's own description, a quick spec sheet, and a short buyer-beware checklist so you know exactly what you're installing before tapping download.

1. Only download through the button on this page — never from third-party mirrors or shortened links, which are the most common way malware spreads.
2. File size is a light 2.36 MB, so it installs quickly even on modest connections.
3. This build is signed by "F-Droid Open Source" — always verify the developer name matches what's listed on the app's official store page before installing an update.
4. After install, Android may prompt you to allow "Install from unknown sources" — approve only this one install, then revoke the permission in Settings > Apps > Special access.
5. We link directly to the APK file or the publisher's repository; we do not modify the binary. Always run a virus scan after any sideloaded install.

Android app making it possible to entirely freeze all background activities of any app.

A note to everyone who was supporting SuperFreezZ over the years:

SuperFreezZ was my first "real" programming project, and I was incredibly happy about strangers donating to me and translating the app into languages I never heard of, and all the positive feedback I received. My start into the world of free and open source software couldn't have been better.

It is hard to imagine now that back in 2018, when I made my first commit, I barely knew how to program at all. I didn't know where to start, so I just forked an app called "APK Extractor", and started finding out. I learned how to organize a (small) codebase, how to interact with a small-but-supportive community, and how to stay focused when there are lots of nice features that could be implemented.

But the time has come to slowly wind down SuperFreezZ. These days, Android devices make it harder and harder for an app like SuperFreezZ to work properly. Also, Android devices are anyways restricting the amount of time an app is allowed to run in the background, making an app like SuperFreezZ less essential (without giving the user control over it, though). Myself, I am mostly busy working on other projects these days (mainly "Delta Chat" and "Chatmail").

It's not over yet, though! If you have an old and slow phone, or if you like that SuperFreezZ gives you control over which app runs and which does not, then enjoy. And who knows, maybe one day, I will revisit this first project of mine, adding more of the features that were asked for over the years, or maybe someone will fork it.

If SuperFreezZ does not work for you, here are a few alternatives I found on F-Droid (though I can't personally vouch for them):

• "Force Stop Helper": Similar to SuperFreezZ, with less features but still maintained, and you need to press "Force Stop" by yourself


• "Drowser": Uses Root to prevent apps from running in the background


• "Shelter": Allows you to isolate apps (and optionally to keep them from running in the background), but requires some extra storage to work

Thanks again for being part of this!

If you want to try out SuperFreezZ, here you go:

SuperFreezZ

• Get back control over what runs on your phone


• Enhance battery life and reduce mobile data usage by freezing rarely used apps


• Especially useful while you are on a tour, where you need only some apps but a long battery life

Greenify can also do this, but it is not Open Source.

SuperFreezZ is not yet another task manager promising to delete 10 GB of data per month or making your device 2x as fast. This is impossible.

Instead, SuperFreezZ is honest about its disadvantages: Freezing daily used apps probably drains your battery a little faster. Also, these apps will take longer to start when you use them the next time: SuperFreezZ will super freeze your apps, it takes about 1-3 seconds to un-freeze them. Greenify has the same disadvantages, except that the author of Greenify does not warn you about it. So: Just do not overdo it, and SuperFreezZ will be super useful.

Examples for apps that deserve to be frozen:

• Untrusted apps (that you do not want to run in the background)


• Apps you rarely use


• Annoying apps

Features

• Optionally works without accessibility service as this slows down the device


• Can freeze only apps not used for a week (can be configured)


• Choose a white list (freeze all by standard) or a black list (do not freeze anything by standard)


• Can freeze apps when the screen goes off


• Options to freeze system apps and even SuperFreezZ itself


• Completely open source and free software

Is SuperFreezZ: App stopper free to download?
Yes. The APK file linked from this page is free. The developer may offer in-app purchases once installed, but obtaining the installer itself costs nothing.

What Android version does SuperFreezZ: App stopper require?
Android 4.1+ or newer. Installing on older devices may cause crashes or refuse to install.

Is SuperFreezZ: App stopper safe to install?
We link to the exact APK published by F-Droid Open Source. We do not modify the file. Still, as with any sideloaded app, scan it with a reputable antivirus before opening it, and only grant permissions the app genuinely needs.

How do I update SuperFreezZ: App stopper?
Install the newer version on top of the old one — Android will keep your data. If the signature differs, uninstall first (you may lose local progress).

Why is the app not installing?
Common causes: not enough storage, an older Android version than 4.1+, or a conflicting build already installed. Free up space, check your OS version, and uninstall any previous copy before retrying.

1. Tap the Download APK button above and save the file to your device.
2. Open your device Settings → Security (or Apps → Special access → Install unknown apps) and allow your file manager or browser to install unknown apps for this one file only.
3. Open the downloaded superfreeze.tool.android.apk file from your Downloads folder.
4. Tap Install and wait for Android to finish.
5. Open «SuperFreezZ: App stopper» by F-Droid Open Source and grant only the permissions it actually needs.
6. Revoke the "unknown sources" permission once you are done installing.

Note: this page hosts or links to the installer only. The application name, icon and description are provided for identification. All trademarks belong to their respective owners.