Is there a reliable Android app that can prevent other apps from secretly using my camera or microphone?

Camera Blocker is an Android security tool focused on preventing unauthorized access to a device's camera and microphone. For users concerned about privacy, especially with the prevalence of apps requesting sensitive permissions, this app offers a practical solution. It works by actively monitoring when the camera or microphone is activated and can block access on a per-app basis. Features include real-time notifications that alert users the moment an app attempts to use these hardware components, along with a detailed list of installed apps and their permission status. This allows for manual toggling to deny or allow access as needed.

In real-world scenarios, such as when using social media or messaging apps that might access the camera in the background, Camera Blocker provides an extra layer of security. Reviews indicate that users appreciate the peace of mind, with one stating they tested it from another device and found it effectively blocked spying attempts. However, some limitations exist. The app lacks a bulk permission management feature, requiring users to adjust settings for each app individually, which can be cumbersome if many apps have camera access. Additionally, verifying the app's effectiveness is challenging since it operates at the system level without visible confirmations beyond notifications. Despite these minor imperfections, the app's 4.4-star rating and positive feedback make it a solid choice for those prioritizing privacy, though users should be prepared for hands-on management.