Comparison

Gas Certificate App UK vs Sauermann Combustion

Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.

Head to head
About

Gas Certificate App UK

Streamline your gas engineering workflow with a digital solution for creating, storing, and sending professional certificates. Manage customers, schedule jobs, and generate invoices and quotes on the go, even offline.

Highlights
  • Digital gas certificate creation
  • Offline work and syncing
  • Customer and job management
  • Invoice and quote generation
  • Automated service reminders
  • Boiler manual library
  • Gas analyser integrations
Features
Read full description

Built for the job, Gas Certificate App helps UK gas engineers replace paperwork with a faster digital workflow. Create, store and send professional gas certificates, manage customers and jobs, schedule work, and prepare invoices and quotes. Supporting gas engineers for more than nine years, the app is built for sole traders, growing teams and larger organisations that need reliable access to their paperwork on site, in the office or on the move. CREATE AND SEND GAS CERTIFICATES Complete industry-standard records from your iPhone or iPad, add electronic signatures and send finished documents to customers without returning to the office. The certificate library includes: • Landlord and Homeowner Gas Safety Records, including CP12 • Gas Service and Breakdown Records • Gas Warning Notices • Gas Boiler Commissioning Checklists • Legionella Risk Assessments • Non-Domestic and Commercial Gas Safety Records • Catering, Leisure and LPG Gas Safety Records • Gas Testing and Purging Records • Domestic and Commercial Oil Certificates • Powerflush Certificates • Unvented Hot Water Cylinder Records • Heat Pump Commissioning and Servicing Records • Mobile Catering Vehicle and Caravan or Boat Safety Records • Installation, Commissioning and Decommissioning Records • Job sheets WORK OFFLINE AND SYNC LATER No signal at the property? Continue without an internet connection. Create certificates, access customer information and manage your schedule offline, then sync your records automatically when you reconnect. MANAGE CUSTOMERS, JOBS AND TEAMS Keep customer details, property addresses, job history, photos and documents organised. Certificates, invoices, quotes and attachments are automatically associated with the relevant address, helping you find previous work quickly. Use the calendar and diary to schedule appointments, create job sheets, assign work and keep your team informed. User permissions, reporting tools and dashboards give businesses visibility across their workload. CREATE INVOICES, QUOTES AND ESTIMATES Build professional invoices, quotes and estimates from the same app. Monitor payment status, identify outstanding or uninvoiced work, send quote-acceptance emails and support Domestic Reverse Charge VAT where required. AUTOMATE SERVICE REMINDERS Stay ahead of annual inspections and encourage repeat business with automated customer reminders. Send service-due and appointment reminders by email or SMS and track important emails. USE PRACTICAL TOOLS ON SITE Work efficiently with tools designed for gas and heating engineers: · Imperial and metric gas rate calculator · Searchable library of more than 5,000 boiler manuals · Postcode lookup and Google Maps integration · TPI, Testo and Sauermann gas analyser integrations · QuickBooks integration and Xero support · File and photo uploads · To-do lists and customer communication tools CREATE PROFESSIONAL DOCUMENTS Add your company logo and electronic signature for consistent documentation. Store certificates, invoices, quotes, job sheets, images and customer records securely, with unlimited cloud storage and syncing between devices. UK-BASED SUPPORT Access UK-based support by live chat, phone or email. Get help with setup, customer imports, troubleshooting and team management. GO PAPERLESS WITH GAS CERTIFICATE APP Spend less time on administration and more time completing work. Create certificates on site, organise jobs, send invoices and stay connected with customers from one gas engineer software platform. Start your 14-day free trial and discover a more efficient way to manage your gas engineering business. Terms of Use: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/ Privacy Policy: https://help.tradeapps.co.uk/en/article/privacy-policy-1rwkmw5

About

Sauermann Combustion

Features
Read full description

Features: - Fast, easy wireless connection to any iOS device* - Remote live view of combustion analysis data as list or graph - Remote control to change settings - Data saving, including automatic logging - Report creation in PDF, CSV (for Excel) and XML formats - Databases for customers, operators & equipment [If you’re using an Si-CA 120, 220 or 320 analyser, please download our “Si-CA MobileApp” from the App Store.] * iOS 12.4 and later – BLE 4.0 capable devices

Screenshots

Gas Certificate App UK4 screens
Sauermann Combustion4 screens

Verdict

The call

The clearest difference is ads: Gas Certificate App UK at none against Sauermann Combustion's shown. Gas Certificate App UK also leads on update cadence (every 2 weeks vs every 2 months). On price, in-app purchases, device support and iOS requirement there is nothing between them.

Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS

CostPrice · In-app purchases · Ads · Monetization

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

UpkeepUpdate frequency

Gas Certificate App UK ships an update every 2 weeks, Sauermann Combustion every 2 months. The most recent releases landed on November 9, 2026 and October 27, 2026 respectively.

Scorecard2 real differences · 6 level
Gas Certificate App UK versus Sauermann Combustion: the parameters behind the verdict, then further details
ParameterGas Certificate App UKSauermann Combustion
PriceFreeFree
Positive reviews60.7% of reviews—
Update frequencyEvery 2 weeks — betterEvery 2 months
AdsNo — betterYes
In-app purchasesNoNo
MonetizationFree—
DevicesiPhone, iPad, iPodiPhone, iPad, iPod
Requires iOS15.614.0 — better
Further details — not scored
Size62 MB25 MB
Age rating4+4+
DeveloperTrade Apps LTDSAUERMANN INDUSTRIE

In-app purchases

None

Gas Certificate App UK

No in-app purchases

None

Sauermann Combustion

No in-app purchases

Questions

Is Gas Certificate App UK free?
Gas Certificate App UK is free to download, with no in-app purchases.
Is Sauermann Combustion free?
Sauermann Combustion is free to download, with no in-app purchases.
Do Gas Certificate App UK or Sauermann Combustion have ads?
Sauermann Combustion shows ads; Gas Certificate App UK does not.
Which is updated more often, Gas Certificate App UK or Sauermann Combustion?
Gas Certificate App UK ships an update every 2 weeks, and Sauermann Combustion every 2 months. Most recently, Gas Certificate App UK was updated on November 9, 2026 and Sauermann Combustion on October 27, 2026.

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