AJapps, an Electrical Engineering Calculator Bench

Field notes

AJapps groups 81 browser calculators into 10 engineering categories, from IDMT relay coordination and arc-flash work to battery, UPS, solar, EV, and building-services calculations. The homepage reports 352 automated checks and links to 59 worked examples alongside 10 category primers. Each calculator is described as having input tooltips, an explanatory panel, and a cited clause or table; deeper harmonic, saturation, and multi-site analysis is identified as subscriber functionality rather than part of the free core.