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CM Security Master Review: Free Android Security Suite with VPN

Cheetah Mobile is the developer behind Security Master, a hugely popular app that is trusted by millions of users around the world. Originally known as CM Security, the app has been upgraded to offer a comprehensive solution that provides security and that can also make your device more efficient. The new Security Master, offers Antivirus, VPN, AppLock and Booster. It is set to offer not only security for your device, but it can also enhance your privacy.

The Intelligent Diagnosis is capable of detecting the phone status including Junk Clean, Antivirus and Phone Booster, which features CPU Cooler and Battery Saver. The Safeconnect VPN & proxy allow you to get around restrictions to get access to the content that you want. In summary, the app brings all that is needed to protect your phone and to ensure that it offers good performance. We’ll find out more details about Security Master in this review.

Setting up the app

You don’t need to create an account in order to be able to start using the Security Master app. It features a user-friendly interface with a menu bar and a bottom navigation. The app’s smart diagnostic tool scans your device to find threats and issues that are having an impact on its performance. Once you open the app on your Android device, it runs a quick scan and after a few seconds, it will be completed and Security Master will let you know if it comes across any security issue.

If the app finds a problem, it labels it as a threat and when the scan has been completed, the security app shows a Remove All button. When you tap on it, the warning messages are cleared and the the threats that Security Master has found, are removed. The app supports the full system scan operation. It goes through the entire file system, checking all the apps and games installed on your device, as well as the files that you have downloaded.


Besides being a powerful antivirus solution, Security Master offers other features that make it a reliable solution to protect your device. Here is the functionality that Security Master supports.

Notification Privacy

The app will prevent unauthorized users from getting access to your notifications. Once the notification privacy feature is enabled, you will see a two-column interface. The first one shows a list of apps and in the seconds one. you will find a list of checkboxes. You just need to select the apps from the list, mark them and tap the OK button to protect them.

Junk Cleaner

With Security Master, you can improve the performance of your phone by getting rid of unwanted files that are piling up. The app cleans junk notifications and other items that are accumulating on your device’s storage.

Network Analyzer

This module allows you to check the speed of your internet connection. It scans the WiFi connection to determine if it is Safe or not and it lets you know the result. The app also checks the network connection to determine the average WiFi, download and upload speeds. It shows you the encryption protocol, the hotspot or the router used. With Security Master, you can save data connection as it allows yoy remove the apps that are using the most internet bandwidth.


Security Master comes with SafeConnect, a VPN that that will add security and flexibility to your internet connection. Once it is enabled, SafeConnect encrypts the outgoing network traffic. You can transfer 200MB of data with this built-in VPN. It is a convenient solution to bypass restrictions since you can connect to a server in a different location. You will be able to see the amount of data that has been transferred, the duration of the VPN connection and also the IP address of the server used.

CPU Cooler

If you are using too many apps simultaneously, your mobile device’s processor will be overwhelmed and if it is in use for too long, it will overheat. Thanks to the CPU cooler feature, the processor will remain cool. To ensure that the processor doesn’t become too hot, Security Master prompts you to close the apps that are running, but that are not in use.

Virus definitions

There is an option that allows you to update the virus definitions. Keeping the virus database up to date, allows Security Master to identify the latest threats so that it can protect your mobile device effectively.

Battery Saver

This is one of the most important features to ensure smooth performance. It doesn’t shut down apps unexpectedly, but instead, it allows you to configure Security Master to hibernate the apps that you don’t use on a regular basis.

Safe browsing

Security Master comes with a convenient web browser. It is possible to stop others from accessing the browser without authorization. To do this, you can set up a password and pattern lock. Users are able to configure Security Master to delete the browsing history, sessions and cookies when the browser is closed. Private browsing is supported and there is also an option to change text, disable images and enable night mode. There is a Photo/Video vault where downloaded images, videos and other content, can be saved.

Caller ID

Security Master also lets you block unwanted calls so you won’t have to deal with annoying telemarketing calls and will also be able to avoid scammers. The app shows you the name and location of an unknown caller.

Setting Interface

The app has a settings panel with options that allow you to schedule a scan, disable, or enable real-time scanning. You can also add apps to the ignore list, disable automatic virus definition updates and more.

Charge Master

There is also a feature called Charge Master, which shows the battery charging status and the apps that are using up the battery power on the lock screen.


This app offers a comprehensive solution to protect your mobile device from threats and ensure that it works as it should. It offers an amazing set of features, reliable performance and it is also easy to use. Overall, Security Master by Cheetah Mobile is an app worth downloading as it contains all the tools needed to add security to your device.