Voltary
The offline electronics toolbox.
Calculators & converters, connector pin-outs, resistor & SMD color codes, a schematic sketchpad and reference tables — for makers, students and engineers. Works offline, in 14 languages.
Free · No account · Works offline
Your bench, in your pocket
Around 30 tools in one app — fast, accurate, and usable without a signal or a sign-up.
Calculators & converters
Ohm's law, LED resistor, voltage divider, 555 timer, filters, reactance, units and more — solved live.
Connector pin-outs
USB, USB-C, HDMI, Raspberry Pi GPIO, Ethernet, SATA and more — clear, interactive diagrams.
Schematic sketchpad
Drop components, snap wires to pins, and sketch circuits with a fast, touch-friendly editor.
Reference tables
Resistor & inductor color codes, SMD codes, number bases, decibels, standard values and formulas.
14 languages
Fully translated — including right-to-left Arabic — with offline non-Latin font rendering.
Offline & private
The tools work with no connection and no account. Ads (which need a connection) help keep it free.
See it in action
Real screens — calculators, connector pin-outs, the schematic sketchpad and offline reference tables.
Free, with a clear conscience
Voltary is supported by ads so the tools stay free. We don't require accounts, and the calculators, pin-outs and references all work completely offline. See our Privacy Policy for exactly what's collected.
Get Voltary — free
Download for Android, iPhone and iPad. No account, no paywall — every calculator, pin-out and reference works fully offline.