The professional toolkit for gas engineers
Certificates, invoices, scheduling, and calculations — all in one offline-first app designed for UK gas professionals.
Built for Gas Engineers
Gas Safety Certificates
Generate CP12, CP15, CP16, CP42, CP44, and more. Professional PDF output ready to share.
Invoicing & Quotes
Create professional invoices with VAT calculations, payment tracking, and customisable templates.
Service Scheduling
Track annual services, set reminders, and sync with Google Calendar. Never miss a CP12 renewal.
Gas Rate Calculator
Quick calculations for gas rates, unit conversions, and meter readings. Metric and imperial supported.
Customer Management
Store customer details, property info, appliance records, and complete service history.
Offline & Secure
Works without internet. All data stays on your device with AES-256 encrypted backups.
Your Data, Your Device
GasMan Pro is built with privacy at its core. We have no servers, no cloud storage, and no user accounts. Your customer data never leaves your device unless you explicitly share it.
You remain the data controller. We're just the tool.