If you run heat input calculations in the field, you already know the problem. Online calculators are rough. Excel sheets break. Doing it by hand mid-inspection wastes time you don't have.
G3 is the first purpose-built heat input calculator for welding and QC inspectors.
Enter your voltage, amperage, and distance. Hit start on the built-in arc timer when the arc strikes. Live readout as you weld — see your heat input building in real time. Stop it when the pass is done. Heat input and travel speed calculate instantly — in kJ/mm or kJ/in, your call.
Built by a working inspector. Designed for real field conditions.

BUILT FOR
• CWB certified inspectors (Canada)
• CWI certified inspectors (USA)
• CSWIP certified inspectors (International)
• API 510, 570, 653, and 1169
• Oil and gas, pipeline, and pressure vessel inspection
• Structural fabrication and shipyard QC

WHAT IT DOES
• Built-in arc timer — tap start when the arc strikes, stop when the pass ends
• Instant heat input and travel speed calculation
• Selectable weld passes: Root, Hot Pass, Fill, Cap — track the entire weld in one place
• Imperial and metric (kJ/mm and kJ/in)
• Fully offline — works on the job site, in the field, underground
• No login. No account. Free.

WHAT'S COMING
G3 is the first module in a full QC documentation platform for inspectors — welder profiles, job history, PDF reports, Bluetooth gauge integration, and credential-specific documentation. Free for the core calculator, always.

What inspectors are saying:
"Best heat input calculator ever. After using a number of heat input calculators in the field, I stumbled across G3. What a blessing in the field, usable offline, able to add welders for future projects, the ability to speak to the developers to make suggestions. It's the all-in-one tool needed for the inspection realm."
— 5 stars, App Store, Canada