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Offline apps a working tradesperson actually uses - on a phone, in the field, with no signal. Machinist speeds and feeds, flat-pattern DXF and G-code, plus NEC electrical, welding, and construction. Calculator apps are free to install; ShopCAM Pro is paid.
Available worldwide · 175 App Store territories · Built in Texas
No install or sign-in. Enter field or shop values and get the result instantly.
Diameter + RPM → surface speed
Open calculator →SFM or Vc ↔ spindle RPM
Open calculator →Chip load or IPR → feed rate
Open calculator →NEC raceway fill → pass or over
Open calculator →UNC, UNF, NPT + metric chart
Open calculator →Voltage + current + travel → kJ
Open calculator →Open the thread, material, raceway, or wire size you already know. Every page gives the computed answer first, then the supporting chart and calculator.
Speeds & feeds, sheet-metal flat patterns, and full multi-op G-code — the shop-floor trio.
For machinists & shop floor
Speeds and feeds formulas (SFM, RPM, IPM) - free web reference, same math as the app.
For fabricators & sheet-metal
For machinists - G-code on your phone
ShopCAM Pro · $19.99/month · $149.99/year · $399.99 lifetime
NEC electrical, welding, and construction math — same offline, no-ads, no-account build.
For welders & fabricators
For electricians (NEC-grade)
For DIYers & weekend builders - the DIY bible
Every app in the family follows the same rules: offline-first, no ads, no accounts, and no tracking. Paid access is offered monthly, yearly, or lifetime; exact pricing varies by app.
Stuck on a calculator. Found an edge case the app didn't handle. Want a calc app for a trade we don't cover yet. Tell us - same small team that builds these, support included.