Observed arrival · 2026-08-27
AnglePro, a Protractor That Lives in Your Browser
A free geometry toolkit measures angles on screens, uploaded images, and webcam feeds, with extras for rulers, levels, polygons, and practice quizzes.
Field notes
The page combines several measurement workflows rather than limiting itself to a static protractor overlay. Screen, image, and webcam modes expose controls for snapping, grids, markers, calibration, and line or polygon construction; exports include PNG, JPG, and SVG. Its teaching layer adds difficulty-based quizzes, blind estimation, target-angle construction, and printable worksheet options, while the calculator handles degrees, radians, gradians, turns, and right-triangle ratios.
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