Smart Level Tool: Bubble Level

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Content rating
Everyone
50+
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Content rating
Everyone
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About this app

Smart Level Tool turns your phone into a bubble level using its motion sensor (accelerometer).

• Surface: a bullseye level for tabletops, shelves and floors, with a live reading for both axes.
• Edge: a single-axis level for a phone stood on its edge, for checking a wall, frame or post — tells you when it is plumb (vertical) or level (horizontal).
• Choose your units: degrees, percent grade, millimetres per metre, or roof pitch.
• Zero the reading on a reference surface, or use a two-point zero to cancel the surface's own slope. Save a zero as a named profile to reuse it.
• Hold a reading, name it and save it. Set a saved reading as a target to match a second surface or wall to the first, within your chosen tolerance.
• The phone vibrates once when level (you can turn this off), or play a tone instead.
• Set your own level tolerance and choose a Balanced or Responsive sensor rate.
• Light and dark themes. Portrait, landscape and tablet layouts.

Good to know
• Accuracy depends on your phone's own sensor and shape: a case or a camera bump can tilt it. Zero the app on a surface you know is level, and check against a physical spirit level for work that must be exact.
• No account is needed. Readings, zero settings and saved items stay on your phone.
• Works without an internet connection.
Bubble level for surfaces and edges, with zeroing and unit choices.
Updated on
Oct 11, 2026

Data safety

Safety starts with understanding how developers collect and share your data. Data privacy and security practices may vary based on your use, region, and age. The developer provided this information and may update it over time.
  • No data shared with third parties
    Learn more about how developers declare sharing
  • This app may collect these data types
    App info and performance
  • Data is encrypted in transit
  • Data can’t be deleted

What’s new

New app Icon.
Smart Level Tool has been rebuilt.

• New Edge tab: a plumb/level check for a phone stood on its edge.
• True degree readings, plus percent grade, mm/m and roof pitch units.
• Zero is now kept between app launches, and can be saved as a named profile.
• Hold and save readings, and match a second surface or wall to a saved one.
• New settings for tolerance, sensor rate, and vibration/tone feedback.