Comparison

GB Gas Pipe Sizing Calculator vs Gas Engineer Software

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

Head to head
About

GB Gas Pipe Sizing Calculator

This tool calculates natural gas pipe sizes for metric copper, stainless, and semi-rigid pipes in the UK. Input appliance gas rates, pipe length, and bends to determine if the installation meets the 1mb drop requirement from meter to appliance. It also suggests the appropriate gas meter size.

Highlights
  • Metric pipe sizing
  • Copper, stainless, and semi-rigid pipe support
  • Calculates 1mb pressure drop
  • Suggests gas meter size
  • Supports up to 30m pipe lengths
  • Instant results for pipe adjustments
Features
Read full description

A natural gas pipe sizing calculator for metric copper, stainless and stainless semi rigid pipes (U.K.). Simply input the information for the appliances Gas Rate size the meter length of pipe in the installation and how many bends will be used. This will tell you if the installation will meet the requirement of a 1mb drop from the meter to the appliance. If not adjust the pipe sizes to get an instant answer to see if it works. Only works for metric 35,32,28,22,15,12,10,8 mm pipes Steel pipes or imperial copper equivalent sizes could be used to give you a good idea, but will not be completely accurate. No need to use calculations and tables to work out pipe sizes, it even tell you what size of gas meter should be fitted. This design tool completes all the hard stuff for you. Pipe tables and pressure drops will only work upto 30m lengths of the chosen diameter. If you find that the pressure drop does not change when changing the diameter, then try a smaller pipe size it may work

About

Gas Engineer Software

This comprehensive app helps gas, oil, and plumbing professionals streamline their business operations. It allows for the creation of industry-specific certificates, issuance of quotes and invoices, and efficient job scheduling. Manage your team, customers, and finances from any device, anywhere, saving time and boosting revenue.

Highlights
  • Create industry certificates
  • Issue quotes and invoices
  • Schedule jobs with calendar
  • Manage team and customers
  • Automated service reminders
  • Offline access
Features
Read full description

Run your heating & plumbing business in one place and keep the diary full. Gas Engineer Software (GES) is the complete job management system built specifically for UK heating and plumbing businesses. Certificates, jobs, quotes, invoices, payments, on-site tools and automatic service reminders: One app, for every job, on your phone or back at the office. More than 7,000 UK businesses trust GES to run their jobs, backed by 14 years in the market. More than a basic gas certificate app, GES is a full system that runs the business issuing them, then turns this year's certificate into next year's booked work. GROW YOUR BUSINESS • Automatic service reminders keep loyal customers coming back year after year and book the repeat work for you • Businesses on GES see an average 37% revenue increase in their first year • Get paid faster with QR codes and payment links included with your invoices (powered by Crezco), with automatic chasing for late payers LOSE THE PAPERWORK • Quickly generate estimates, quotes, and invoices with templates or an AI draft, complete with statuses and payment tracking • Convert accepted quotes into invoices in one tap • UK gas, oil, and heat pump certificates, signed on-site and sent • Send appointment confirmations to customers in one click • Generate customer statements in seconds • GES saves each person on the team 6.6+ hours a week BUILT FOR HEATING & PLUMBING • The entire GES workflow is designed around heating & plumbing jobs, not bolted onto a generic trades system • Manage your jobs, your diary, and your team in one place. GES works perfectly for sole traders and larger operations that need to connect office staff with engineers • Sync payments, customers, and invoices to Xero, QuickBooks, or Sage • Pull readings from your Anton, Kane or TPI flue gas analyser straight into a certificate • Reference 2,300+ boiler manual PDFs in the app, along with AI Assist to get the answers you need faster • In-app calculators for gas rating, pipe sizing, installation volume, and tightness testing • UK-built, with UK support that actually knows heating via phone, chat, and email • Full offline access on the mobile apps, syncing when next online TRUSTED WITH WHAT MATTERS Your business data, certificates and property records are important, and the engine of your repeat work. GES has 14 years of experience keeping everything safe & adhering to data security best practices. EVERY CERTIFICATE, BUILT IN Gas: Homeowner Gas Safety Record · Landlord Gas Safety Record (CP12) · Gas Warning Notice · Gas Service Record · Gas Breakdown Record · Installation & Commissioning Checklist · Non-Domestic Gas Safety Record · Leisure Industry Gas Safety Record · LPG Gas Safety Record · Non-Domestic Testing & Purging Record · Non-Domestic Catering Record. Oil: CD/10 Installation Completion · CD/11 Servicing & Commissioning · CD/12 Landlord Oil Installation Check · CD/14 Oil Warning & Advice Notice · TI/133D Oil Storage & Tank Risk Report. Other: Air Source Heat Pump Service Record, Legionella Risk Assessment, Minor Electrical Works Record, Unvented Hot Water Cylinder EVERYTHING ELSE IN ONE PLACE Job sheets · quoting & invoicing · job scheduling with calendar · team management and roles · customer database (CRM) · automatic boiler service reminders · email and SMS reminders · web portal syncing · full offline access · gas rating, pipe sizing & installation volume calculators. REQUEST A DEMO If you want to see the app in action or get a better idea of how it works, book a demo with our team. We'll give you a thorough walkthrough & answer any questions. https://gasengineersoftware.co.uk/gas-engineer-software-demo/ QUESTIONS? Contact our customer support team at support@gasengineersoftware.co.uk or 0207 129 7058

Screenshots

GB Gas Pipe Sizing Calculator4 screens
Gas Engineer Software4 screens

Verdict

The call

The clearest difference is review sentiment: Gas Engineer Software at 85% against GB Gas Pipe Sizing Calculator's 38%. Gas Engineer Software also leads on price (Free vs $9.99) and update cadence (weekly vs every 5 months). GB Gas Pipe Sizing Calculator's advantage is in-app purchases (none vs 1). On ads and device support 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

Gas Engineer Software is free to download; GB Gas Pipe Sizing Calculator costs $9.99 up front. Gas Engineer Software sells 1 one-off in-app purchase. GB Gas Pipe Sizing Calculator asks for nothing beyond the download.

UpkeepUpdate frequency

GB Gas Pipe Sizing Calculator ships an update every 5 months, Gas Engineer Software weekly. The most recent releases landed on October 26, 2026 and October 22, 2026 respectively.

Scorecard6 real differences · 2 level
GB Gas Pipe Sizing Calculator versus Gas Engineer Software: the parameters behind the verdict, then further details
ParameterGB Gas Pipe Sizing CalculatorGas Engineer Software
Price$9.99Free — better
Positive reviews37.5% of reviews84.8% of reviews — better
Update frequencyEvery 5 monthsWeekly — better
AdsNoNo
In-app purchasesNo — betterYes
MonetizationPaidFree with in-app purchases — better
DevicesiPhone, iPadiPhone, iPad, iPod — better
Requires iOS26.015.0 — better
Further details — not scored
Size2 MB194 MB
Age rating4+4+
DeveloperGB-GAS.CO.UKSoftware Works for You Ltd

Customer experience

GB Gas Pipe Sizing Calculator

Written reviews16 reviews
Positive37.5%
Neutral12.5%
Negative50.0%

Gas Engineer Software

Written reviews66 reviews
Positive84.8%
Neutral3.0%
Negative12.1%

Bugs and requests

GB Gas Pipe Sizing Calculator

Not enough reviews yet to summarise bugs or requests.

Gas Engineer Software

Reported bugs

5 issues
  • Unexpected site shutdowns
  • Syncing is slow
  • Glitches in invoicing following a job report
  • App has become very slow due to latest update
  • Not usable at present time

Requested features

6 requests
  • Add multiple picture attachments
  • Select several photos at once
  • Flag jobs as finished
  • Oil forms for non-OFTEC registered companies
  • Calculate pipe work volume and purge volume
Show 1 more
  • Cheaper option for extra engineers

In-app purchases

None

GB Gas Pipe Sizing Calculator

No in-app purchases

1 purchases

Gas Engineer Software

One-time1
  • Single Engineer - 12 Months Subscription$19.00

Questions

Is GB Gas Pipe Sizing Calculator free?
GB Gas Pipe Sizing Calculator costs $9.99, with no in-app purchases.
Is Gas Engineer Software free?
Gas Engineer Software is free to download, with in-app purchases available.
Do GB Gas Pipe Sizing Calculator or Gas Engineer Software have ads?
Neither GB Gas Pipe Sizing Calculator nor Gas Engineer Software shows ads.
Which is updated more often, GB Gas Pipe Sizing Calculator or Gas Engineer Software?
GB Gas Pipe Sizing Calculator ships an update every 5 months, and Gas Engineer Software weekly. Most recently, GB Gas Pipe Sizing Calculator was updated on October 26, 2026 and Gas Engineer Software on October 22, 2026.

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