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Free Ladder Safety App for Android and iPhone – NIOSH

NIOSH Ladder Safety app on a smartphone, showing a "Great" reading of 75.6 degrees for ladder angle.

The USA National Institute for Occupational Safety and Health (NIOSH) has a phone app which uses vibration and visual signals to assist in ensuring correct ladder angles. The App also provides a range of useful ladder safety tips. The app is free and available for both Android and iPhone devices.