As the PERMA DPW specialist, I use many tools when reviewing the safety of a member location, including several smartphone applications. These apps assist me in estimating decibel levels, heat stress, and ladder angles. You might find them useful as well.

Safe Lifting Calculator, from Oregon OSHA and the Washington State DOL
Apple iOS
Android

Sound Level Meter – If you experience decibel readings that are high using this app, I would recommend that you utilize a decibel meter to attain an accurate measurement.
Apple iOS
Android

Ladder Safety, from NIOSH
Apple iOS
Android

Heat Safety Tool, from OSHA and NIOSH
Apple iOS
Android

Tool Box Talks, from the Construction Center for Excellence
Apple iOS

While good for estimation, please remember that smartphone apps are not infallible. Properly calibrated measurement equipment should be used for record keeping purposes, or if any estimation causes concern.
Ed Starowicz, public works risk management specialist