Perfect AppLock is a highly-rated Android application providing robust app protection via PIN, pattern, or gesture locks. Safeguard sensitive apps like WhatsApp, Facebook, Twitter, Skype, SMS, email, gallery, camera, and USB connections with ease. The free version offers all pro features without limitations.

Key features include screen dimming control per app, preventing screen rotation on a per-app basis, a "watchdog" that photographs unauthorized access attempts after three failed logins, and the ability to lock various device settings. It also employs deceptive error messages and utilizes minimal system resources. Remote control via SMS commands is also supported. Multiple password types – gestures, PINs, patterns, and text passwords – ensure comprehensive security. Compatible with Android 5.1.1 Lollipop and upwards, it's trusted by millions.

Perfect AppLock (App Protector) Highlights:

• Comprehensive App Locking: Secure sensitive apps (WhatsApp, Facebook, Twitter, Skype, SMS, email, gallery, camera, USB, settings, etc.) with PINs, patterns, or gestures.
• Screen Filter Management: Fine-tune app-specific screen brightness for optimal display control.
• Rotation Lock: Prevent unwanted screen rotation within individual apps for enhanced usability.
• Intrusion Detection: The watchdog feature captures images of intruders after three unsuccessful login attempts.
• Device Feature Locking: Lock WiFi, 3G data, Bluetooth, syncing, and USB access to further enhance security.
• Flexible Locking Policies: Customize locking based on time or WiFi connection status.

In short: Perfect AppLock offers a secure and versatile solution for protecting your apps and device settings using PINs, patterns, or gestures. Its advanced features, including screen dimming, rotation lock, and intrusion detection, make it a powerful tool for enhancing your mobile privacy. Download Perfect AppLock today and bolster your Android device's security.