Handjive

Handjive is an Android app locker that lets you protect selected apps with a personal hand-sign gesture. Create or change your gesture, then use it to unlock apps such as social, banking, messaging, and file apps.

Handjive uses Android’s Accessibility Service to detect when a protected app is opened and show its authentication prompt. According to the app description, the service monitors app-launch events and does not access app content or collect or share personal data.