Generate Gas Certificates in Seconds
Simple Gas App is the complete toolkit for UK gas engineers. Generate 30+ certificates, create invoices, access powerful calculators, and manage your work offline. Everything you need, beautifully simple.
Everything You Need
A complete solution designed specifically for UK gas engineers. All the tools in one place.
30+ Certificate Types
Generate Gas Safe Certificates, CEPE, POTTERTON, VAILLANT, WORCESTER, and many more tailored for UK requirements.
Invoice & Quotes Generator
Create professional invoices and quotations instantly. Customize templates with your branding and send directly to clients.
4 Built-in Calculators
Gas rate, heat loss, pipe sizing, and savings calculators to help you provide accurate quotes and estimates.
Easy to Use Interface
Intuitive design built for engineers. No steep learning curve. Start using immediately with zero training.
Offline Mode & Cloud Sync
Work offline and automatically sync your data to the cloud when connected. Never lose your work.
Appliance Manuals
Access a comprehensive library of appliance manuals directly in the app. Always have the information you need.
30+ Certificate Types Supported
All major UK gas safety certificates and compliance documentation. Cover every scenario and appliance type.
✓ All certificates are fully compliant with UK regulations
More certificates being added regularly based on engineer feedback
Professional Calculators
Four powerful tools to help you make accurate calculations and provide better quotes to your clients.
Gas Rate Calculator
Calculate accurate gas consumption rates based on appliance specifications, efficiency ratings, and usage patterns.
Heat Loss Calculator
Determine building heat loss requirements for proper boiler sizing and system design recommendations.
Pipe Sizing Calculator
Calculate optimal pipe diameters based on flow rates, pressure drops, and system requirements.
Savings Calculator
Show clients potential savings with energy-efficient upgrades and equipment replacements.
Simple, Transparent Pricing
Start free and upgrade when you're ready. No hidden fees, cancel anytime.
Free
Perfect for getting started
Pro
For professional engineers
Frequently Asked Questions
Can I cancel my Pro subscription anytime?
Yes, cancel anytime with no questions asked. Your access will continue until the end of your billing period.
Do you offer refunds?
We do not offer free trials, but Pro subscriptions come with a 30-day money-back guarantee. Check our refunds policy for details.
What payment methods do you accept?
We accept all major credit cards (Visa, Mastercard, American Express) and UK bank transfers.
Is my data secure?
Yes, all data is encrypted in transit and at rest. We are fully GDPR compliant with regular security audits.
Download Simple Gas App
Available on iOS and Android. Download now and start generating certificates instantly.
Or download directly to your device
Generate certificates in seconds with our intuitive interface
Work anywhere, anytime. Sync automatically when connected
GDPR compliant with enterprise-grade encryption
System Requirements
iOS
- iOS 15.0 or later
- iPhone, iPad
- 50 MB storage space
Android
- Android 8.0 or later
- 60 MB storage space
- 4.4+ Android version
Ready to Simplify Your Work?
Join hundreds of UK gas engineers already using Simple Gas App to save time, reduce errors, and impress clients.