MechRef

HRSoftware

In-app purchases

About this app

MechRef is a professional mechanical engineering reference and calculator app, inspired by the classic reference book "Máquinas" by A.L. Casillas.

Designed for engineers, technicians, and students who need fast, reliable calculations based on international standards.

FREE MODULES:
• Threads — ISO Coarse, ISO Fine, UNC, UNF with tap drill recommendations
• Fits & Tolerances — ISO 286-1 hole basis system with tolerance diagrams
• Converter & Constants — 180+ unit conversions across 14 disciplines, plus 65 engineering constants
• Areas & Volumes — 2D and 3D geometry calculations
• Geometry & Trigonometry — Triangle solver, arc & sector, trig functions, polygons

MECHREF PRO:
• Gears — Spur, helical, rack & pinion, bevel, ISO modules
• Springs — Compression, extension, torsion, leaf springs
• Shafts & Keys — Design by torque, bending, and keyway selection
• Belts & Chains — V-belt, flat belt, roller chain, timing belt
• Machining — Cutting speed, feed rate, MRR, and power calculations
• More Pro modules coming soon!

One-time purchase. No subscription. No ads.

Currently available in English and Spanish. More languages coming soon.

What’s new

Maintenance update: improved measurement for our advertising, plus minor under-the-hood updates. No feature changes.