Bubble Level & Toolbox App

Measure: Ruler, Angle & Watch

Free · In‑App Purchases · Designed for iPad. Not verified for macOS.

Turn your iPhone into the ultimate toolbox. Precise spirit level, ruler, protractor, and sound meter in one completely ad-free app. Now with Apple Watch sync! The precise spirit level, accurate ruler, and smart protractor in one app. The ultimate multi-tool for DIYers, campers, and professionals. Whether you want to hang pictures perfectly straight, align the washing machine with millimeter precision, or level your camper – Tool Assistant turns your iPhone and Apple Watch into a reliable measuring tool. Completely without annoying ads and data collection! Highlights at a glance: 3-in-1 Spirit Level: Use the classic circular bubble level for surfaces or the tubular levels for precise edges and inclines. The perfect level for any DIY project. Precise Ruler: Measure objects directly on your screen. The digital ruler can be calibrated exactly to your iPhone size. Apple Watch Spirit Level (Pro): The absolute game-changer when you need both hands! Get the live display directly on your wrist. Synchronizes in real-time – ideal when screwing under cabinets or machinery. AR Laser Plumb Bob (Pro): Project a virtual laser plumb line directly into the room using Augmented Reality (ARKit). Perfect for aligning objects precisely on the wall over larger distances. Protractor (Pro): Simply place your iPhone on the object and measure the exact tilt angle in degrees. Decibel Meter (Pro): Measure volume and noise pollution in dB in real-time. Ideal for the workshop, construction site, or loud neighbors at the campsite. Premium Dark Mode: A high-contrast, dark design (OLED-optimized) that saves battery life and is perfectly readable even outside in the sun. 100% Privacy: No registration, no tracking, no ads. Your measurement data stays completely offline and only on your device. Turn your iPhone into the smartest tool in your toolbox and download Tool Assistant for free now!

Events

Ratings & Reviews

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This update brings two highly requested features for even more measuring convenience: • Decibel Meter on Apple Watch (Pro): You can now view the decibel values live and in real-time not only on your iPhone but directly on your Apple Watch. • Ruler Upgrade: The measurement display (mm/inch) on the ruler can now be freely dragged across the screen with your finger and recentered with the push of a button. This way, the numbers will never hide the object you are currently measuring! • Watch information video Do you like the update? As a solo developer, I really appreciate a quick review in the App Store!

Version 1.1.3

The developer, Marco Pohl, 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
    • Marco Pohl
    Size
    • 38.1 MB
    Category
    • Utilities
    Compatibility
    Requires iOS 26.0 or later.
    • iPhone
      Requires iOS 26.0 or later.
    • iPad
      Requires iPadOS 26.0 or later.
    • Mac
      Requires macOS 26.0 or later and a Mac with Apple M1 chip or later.
    • Apple Vision
      Requires visionOS 26.0 or later.
    • Apple Watch
      Requires watchOS 10.6 or later.
    Languages
    • English and German
    Age Rating
    4+
    In-App Purchases
    Yes
    Copyright
    • © 2026 Marco Pohl
  • Developer Website
  • Privacy Policy

    • More by Marco Pohl