Observed arrival · 2026-09-24
A phone-sized digital angle finder
FreeAngleFinder turns a phone’s motion sensors into a browser-based level and angle tool, with readings for slope, roof pitch, and more.
- For
- Phone users checking levels, slopes, or roof pitch
- Worth noticing
- The page specifies an 880 Hz chime that sounds when the reading is within ±0.35° of level.
Field notes
On mobile, the page requests motion-sensor permission before readings begin; desktop laptops are explicitly unsupported. The interface offers flat-surface and edge modes, smoothing, tare/zero, hold, and copy controls, with readings also expressed as slope percentage, roof pitch, or radians. Its tutorial recommends removing raised-camera-bump cases for flush contact and describes an 880 Hz level chime within a stated ±0.35° tolerance. These are page-described behaviors, not independently verified measurements.
Observed signals
Read the marks
Editorial observations of this landing page, not a rating.
One card from the complete issue