Ladder Angle: 4:1 Safety

Set your ladder at the safe 4:1 angle every time. Ladder Angle turns your phone into a live inclinometer and a quick calculator, so you climb with confidence on the job site or at home. Straight-ladder accidents almost always come down to the wrong angle — too steep and it tips back, too shallow and the feet slide out. This tool makes the right setup obvious in seconds. WHAT YOU GET • Live inclinometer — lean your phone on the rail and read the real angle; it turns green inside the 73–78 safe zone • 4:1 angle calculator — enter your height or base distance and get the correct placement instantly • Safe-setup checklist — a pre-climb routine you tick off on site: inspect, level, set the angle, extend above the edge, secure and climb • Three points of contact and belt-buckle guidance built in • Ladder duty ratings (Type IAA to III) so you match the ladder to the load • Save your common setups and reopen them in a tap • Works fully offline — no account, no ads, no tracking HOW IT WORKS 1. Measure — enter your reach, or rest the phone on the ladder rail 2. Check — see the live angle and a clear safe or adjust verdict 3. Climb — follow the checklist and the 4:1 rule with confidence BACKED BY THE STANDARDS The 4:1 rule (about 75) reflects OSHA 1926.1053 for construction and ANSI A14 duty ratings. A quick reference is built into the app. FULL ACCESS Full access to the inclinometer, calculator, setup guide and saved setups is unlocked with a weekly or yearly plan, or a one-time lifetime purchase. Set it right, climb safe. Terms of Use: https://web-levi.web.app/terms Privacy Policy: https://web-levi.web.app/privacy-policy Questions or feedback: tphuc.work@gmail.com