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Clean Master (Speed Booster)

FREE Low Maturity android
Cheetah Mobile
Overall Satisfaction click me 97
It's an awesome and superb cache cleaner and speed booster.
Great cleaning tool for phone and tablet simply awesome.
I'm happy you are back to my phone thanks.
Best app thanks devs.
The best optimizer available on play store.
The best in the world I seen.
Totally recommended this app.
Fun & Engaging click me 96
Its the awesome cleaner I recommend all to use it.
It's the most awesome cleaner.
Awesome thanks for the application.
Awesome thanks for the hard work.
Usefulness click me 96
This app cleans everything unneeded off my phone.
nice and excellent and very usefull apps.
saves time and boosts phone functioning.
Really helpful application to optimize my device memory.
It keeps everything running at top speed.
The moust helpfull app I have ever downloaded :.
Using since one year very nice & useful software.
Production Values click me 98
excellent all round and very clear and easy interface.
Quick and clean easy interface.
Ease of Use click me 94
Does the job perfectly and a very clean and simple app.
Good clean and simple app that works.
excellent all round and very clear and easy interface.
Quick and clean easy interface.
Fast simple optimises helps the phone actually like a Dr.
It Was Fast Simple And Great.
Reliability click me 66
I did a factory reset.
before installing this app i faced a lot of problems with my phone.
Haven't gotten any problems with my phone when I got the app.
Ads not Intrusive click me 74
Security & Privacy click me 58
I use this in conjunction with their CM Security app.
Terrific 1st security app for new device user.
Battery click me 85
Downloaded this in conjunction with this company's other app - Battery Doctor.
Had to uninstall it and only keep battery doctor.
Cleans your system great my battery lasts alot longer now.
Since deleting my battery lasts a lot longer.
Click blue bar for explanation of rating.
The World's Most Trusted Optimizer, Clean Master, Helps Clean Up Over 400 Million Phones!

When Do You Need Us?

CM is perfect for you if your phone has become laggy or runs out of battery easily, if it's stopped playing games smoothly, if it becomes too hot to hold, or if you want to free up some space to store more photos or songs.

What We Can Do For You

We make it easy to free up more storage from your phone and SD card, boost games and device memory, enhance speed & extend battery life, stop overheating and protect your device against malicious apps and vulnerabilities.

Highlights of Clean Master - Phone Booster & Antivirus

☆ Accurate: The junk-creating behavior of millions of apps has been analyzed so that Clean Master can efficiently hone in on its targets (cache and residual files) with perfect accuracy.

☆ Fast & Intuitive: Simple to use, super-fast and smooth UI, plus cool transition effects
☆ Ranked #1 by AV-TEST for the seventh time! A professional quality antivirus service scans devices in just 8 seconds, 500% faster than other paid antivirus apps.

Features of Clean Master- Phone Booster & Antivirus


Cool off your device by finding and stopping the apps that are causing it to overheat.


Delete cache and residual files to reclaim storage, boost speed and improve the performance of your device and SD card.


Boost your games and apps, free up memory (RAM), speed up your device and save more battery. Our 1 Tap Boost and Game Boost features make it easy to optimize directly from your homescreen.


Calculate how much CPU is being used by apps on your device. Stop apps from wasting battery, slowing down your device and overheating.


Scan the system, pre-installed and user-installed apps to keep your device safe from viruses, trojans, vulnerabilities, adware and spyware. Keep your privacy safe by scrubbing personal info from your device.


Uninstall unwanted apps or bloatware and back up important ones. Some rooted devices will be able to move apps to the SD card as well as uninstall pre-installed and system apps. Our own Picks section lets you find useful apps that match your interests.


Supported languages

Arabic, Bulgarian, Chinese, Croatian, Czech, Dutch, English, French, German, Greek, Hebrew, Hungarian, Indonesian, Italian, Japanese, Korean, Norwegian, Polish, Portuguese, Romanian, Russian, Serbian, Slovak, Spanish, Thai, Turkish, Ukrainian, Vietnamese, Malay

Want to join our volunteer team? Apply to get started:


Stay connected!

Join our community:


Requested permissions

Camera permission: This permission is used for Clean Master's flashlight feature, which uses the camera flash from the device's rear camera. Clean Master does not use the device's microphone at all - Android lists both camera and microphone permissions together, even if only one is used.


Help fight against deceptive ads

Cheetah Mobile (formerly KS Mobile) is committed to fighting against misleading downloads. You can find our full official policy on this matter here:

If you come across one of these ads, you can help us to take them down. Please visit the following URL and fill out the requested information - . The more detail you can give the better. Thanks for helping us improve the Android ecosystem!

This app helps me keep my phone running in tip top shape. found in 15 reviews
The best optimizer available on play store. found in 8 reviews
Smoothest and most efficient cleanup app ever. found in 8 reviews
This is the best tool for optimizing phone memory and overall. found in 7 reviews
I got rid of SO many games with a push of a button. found in 6 reviews
Get your device running smooth as silk with this app. found in 5 reviews
Several devices later and this is the best cleaner app on the market. found in 5 reviews
nice and excellent and very usefull apps. found in 12 reviews
Very good aplication and it does good things. found in 23 reviews
Super service and mind blowing app. found in 10 reviews
Awesome app ever seen before I use. found in 4 reviews
The moust helpfull app I have ever downloaded :. found in 7 reviews
Time saver and battery saver at the same time. found in 6 reviews
This is a great utility. found in 10 reviews
makes a difference thank you. found in 7 reviews
The best in the world I seen. found in 7 reviews
love CM Backup & Boost. found in 5 reviews
this works like magic. found in 6 reviews
Allows you to either deep clean or quick clean your phone. found in 5 reviews
A very good and handy app. found in 3 reviews
App wipe the music files as junk files. found in 573 reviews
Really works with cleaning up junk my phone tends to accumulate. found in 32 reviews
it doesnt clean properly and big disapontament is. found in 8 reviews
Annoying ads lose it a star but still worth having. found in 5 reviews
Don't even need anti virus if u have this app. found in 61 reviews
Great app for removing junk files n much more n optimization. found in 7 reviews
This app is helpful to clean junk data. found in 10 reviews
Excellent but contains too much ads. found in 5 reviews
actually seriously slowed my phone down. found in 5 reviews
It asks many permissions idont want to give that many permissions. found in 6 reviews
keep asking me for a root permission. found in 5 reviews
New permissions allow camera to take photos without you knowing it. found in 5 reviews
The app sucks right now. found in 5 reviews
Can't create shortcut for 1 tap boost when using Apex Launcher. found in 3 reviews
You can't clear the browser history like other apps allow. found in 5 reviews
Please reduce the app size and data. found in 6 reviews
FLOATING WIDGET PROBLEM. found in 3 reviews
bcoz no more space to download what I want. found in 4 reviews
But i need help on moving apps to SD card which it failed. found in 42 reviews
you go to app manager and nothing changes anywhere. found in 30 reviews
Recent updates lock screens and force ads onto home screen. found in 24 reviews
It's annoying that it keep deleting my apk file. found in 12 reviews
My external sd card is not working abd picture deleted. found in 9 reviews
Cannot kill task and running applications. found in 9 reviews
I would give five stars but ignore list is not working. found in 8 reviews
Way to many notifications - uninstalled. found in 8 reviews
Doesnt clean my internet history. found in 8 reviews
Clear search history is not working. found in 7 reviews
This app wiped my SD card and pictures and videos. found in 7 reviews
Too many permissions. found in 6 reviews
Need an update or will un install it for sure. found in 6 reviews
it doesn't boost RAM anymore. found in 6 reviews
It just making my phone lag and my game crash. found in 6 reviews
Its even worse than history eraser. found in 5 reviews
Why need all those new permissions. found in 5 reviews
rated better for file manager.   rated better for task manager.  
rated better for game data.   rated better for flash light.  
rated better for auto kill.  
"This is the best task killer app I have ever installed."
"This task killer allows my phone to run better."
"This advanced task killer is defenitly advanced it works every time."
"super task killer fast booster takes less than 0."
"fast task killer which greatly impoves my phone's speed."
"Saves battery more efficiantly then advanced task killer."
"Best antivirus app that work well in my android phone."
"It's one of the best antivirus software in google play store."
"Just the best antivirus app for my & your smartphone :D."
"Best antivirus app out there & worth every dollar spent."
"The best Antivirus app i have ever used for my android."
"Superb antivirus application and very user friendly - highly recommended."
"This is the best battery saver app ive ever download Go you."
"Easy battery saver is nice app save your battery for android."
"This is by far the best battery saver app i have ever used."
"When I try 2x battery saver it made my battery last 1."
"Fine Combine with Easy Battery Saver and gain advanced battery control."
"Best battery saver app with plenty of options for the power user."
20,498,033 total

This app is popular with:
  • especially those who play games alot.
  • Great way of saving space on my device.
  • It's an awesome and superb cache cleaner and speed booster.
  • saves time and boosts phone functioning.
  • "Y this app need permission to access my phone calls."
  • "Keeps spamming my notification bar telling me what to do."
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