The Goblin: Magnet Detector

The Magnetic Motion Detector

Only for iPhone

$49.99 · Designed for iPhone. Not verified for macOS.

iPhone

Finder of Hidden Things The Goblin is a performance tool for mentalists, magicians, and experimental artists who work with hidden magnetic props. It allows you to sense when a magnetic object or an object containing a concealed magnet is moved near your phone. The app listens to changes in the phone’s built-in magnetic sensor and responds in real time with subtle haptics or vibration. This is not a proximity scanner, and it does not track people, objects, or locations. A magnet sitting still may produce little response. Movement creates change, and change is what the Goblin reacts to. Designed for live performance, the Goblin behaves more like a living creature than a simple meter. It learns the room’s background magnetism, filters environmental noise, and reacts only when something genuinely changes. This keeps behaviour stable in real-world venues such as theatres, bars, homes, and outdoor spaces. Features: • Magnetic movement sensing using the phone’s magnetometer • Adjustable Fog control to balance sensitivity and stability • Discreet haptic feedback or strong vibration modes • Stealth Mode for pocket and walk-around performance • Automatic noise filtering and room adaptation • Hands-free operation once configured Typical Uses: • Detecting movement of a concealed magnetic ring or coin • Performance cues for mentalism and magic routines • Creative exploration of magnetic motion The Goblin does not collect personal data and does not use the camera. All sensing happens locally on your phone.

Ratings & Reviews

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- Improved Stomps (vibration) response - Added "custom screen" option for Stealth Mode - Improved Stealth Mode full-screen effect - Clearer instructions - Added 25-minute video tutorial - Minor bug fixes and improvments

Version 1.2

The developer, LEWIS GARETH K LE VAL, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy .

  • Data Not Collected

    The developer does not collect any data from this app.

    Privacy practices may vary, for example, based on the features you use or your age. Learn More

    Accessibility

    The developer has not yet indicated which accessibility features this app supports. Learn More

    Information

    Seller
    • LEWIS GARETH K LE VAL
    Size
    • 1.3 MB
    Category
    • Entertainment
    Compatibility
    Requires iOS 18.6 or later.
    • iPhone
      Requires iOS 18.6 or later.
    • Mac
      Requires macOS 15.6 or later and a Mac with Apple M1 chip or later.
    • Apple Vision
      Requires visionOS 2.6 or later.
    Languages
    • English
    Age Rating
    4+
    Copyright
    • © 2026 Lewis Le Val
  • Privacy Policy

    • Supports

    • Family Sharing

      Up to six family members can use this app with Family Sharing enabled.

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