How It Works
Set up SignLock in just a few minutes. No account needed, no cloud required.
Install & Grant Permissions
Enable Accessibility Service and disable battery optimization so SignLock can protect your apps reliably.
Select Apps to Lock
Pick any app from your installed apps list. Search and select the ones you want to protect.
Draw Your Signature
Draw any unique pattern or signature you can remember. Confirm it twice for accuracy.
Set a Backup PIN
Choose a 4 or 6-digit backup PIN as a recovery option. Encrypted and stored securely on your device.
Start Protecting
That's it! Your apps are now locked. Draw your signature to unlock them anytime.
Everything You Need
SignLock packs powerful features to keep your apps secure while giving you full control.
Drawing-Based Unlock
Unlock your apps by drawing your personal signature or pattern. No PINs to remember, no patterns to trace.
Backup PIN Recovery
Set a 4 or 6-digit backup PIN. Encrypted via Android Keystore and stored securely in case you forget your drawing.
11 Drawing Themes
Choose from Classic, Neon, Ocean, Monochrome, Forest, Sunset, Minimal, Glass, Electric, Particle, Ink, and Invisible themes.
Custom Wallpapers
Use any image from your gallery as the unlock screen background. Adjust opacity, zoom, pan, and rotation.
Privacy Mode
Hide your strokes while drawing to prevent shoulder surfing. Your signature stays private.
Smart Scheduling
Set time-based protection schedules per app. Always Protected or Scheduled mode. (Premium feature)
Lock Policies
Choose 'Ask every time' for constant protection or 'After screen lock' to unlock once per session.
100% Offline
Everything runs on your device. No internet required. Your data never leaves your phone.
AES-256 Encryption
Your drawing template and PIN are encrypted using AES-256/GCM via Android Keystore before storage.
Beautiful Drawing Themes
Personalize your unlock screen with 12 unique themes. Each with custom backgrounds, stroke effects, glow, and animations.
Classic
Neon
Ocean
Monochrome
Forest
Sunset
Minimal
Glass
Electric
Particle
Ink
Invisible
Smart Unlock Experience
Draw to Unlock
Open a protected app and SignLock instantly shows the drawing canvas. Draw your signature to unlock.
Grace Period
Switch between apps freely. If you return within 1.5 seconds, no lock screen is shown.
Backup PIN
Can't remember your drawing? Use your backup PIN. After too many failures, a 30-second lockout activates.
Privacy First
The unlock screen is protected with FLAG_SECURE — no screenshots or screen recording can capture it.
signlock
App Locked
Draw anywhere to unlock
Security by Design
Your data never leaves your device. SignLock is built on a zero-trust, privacy-first architecture.
AES-256/GCM Encryption
Your drawing template and backup PIN are encrypted with military-grade AES-256 via Android Keystore. The encryption key never leaves secure hardware.
100% Offline
No internet connection required. Everything is processed locally on your device. No servers, no cloud, no data transmission.
Automatic Recovery
If encryption keys are ever corrupted, SignLock automatically resets to prevent lockout. Your data stays safe and accessible.
Gesture Recognition
Advanced multi-factor matching algorithm compares point distance, direction similarity, and stroke length for accurate forgery detection.
Your Privacy is Our Promise
SignLock operates entirely on your device. We never have access to your drawing, your PIN, or the apps you protect. There are no accounts, no sign-ups, and no data collection. What you lock stays locked — only you hold the key.
Built on Strong Foundations
Unlock Premium Features
Get the most out of SignLock with a premium subscription.
Free
$0
- Drawing-based app locking
- Backup PIN recovery
- Classic drawing theme
- Standard lock policies
- Ad-supported
Premium
Subscription
- Everything in Free
- All 12 drawing themes
- Smart scheduling per app
- Ad-free experience
- Custom theme requests
- Best support