Updated for UP1B Edition 4

Still working outyour gas testson scrap paper?

Tivy helps you handle commercial gas testing for UP1, UP1A and UP1B gas installations, with tightness testing, strength testing and purging results ready in seconds and professional gas pipework commissioning reports ready before you leave site. With Tivy, there's:

✕No more mathematical errors
✕No more second guessing your results
✕No more staring at tables and formulas

Free for two weeks · No card needed

Download on App Store Download on Play Store

How it works

Create gas pipe commissioning reports in

3 simple steps.

Step 1

Calculate Your Installations Volume

Select your meter, installation type (new/existing), operating pressure and add your pipe sections to accurately calculate your installation volume.

Step 2

Run Your Tests

Once your system volume is calculated, Tivy automatically classifies it as UP1, UP1A or UP1B. Then input the appropriate values for tightness tests, strength tests, and purging procedures.

Step 3

Share Your Report

Export a professional PDF report and send it straight to clients or colleagues on the spot.

Pricing

Choose Domestic or Commercial

Pick the version that matches the work you carry out, with report-ready outputs and app updates included.

Tivy Commercial

UP1UP1AUP1B

For commercial gas engineers

Tightness Testing
Strength Testing
Purging Information
Subsection Testing
PDF Reports

Subscription

Annual Subscription

£59.99/year

Monthly Subscription

£8.99/month

Free for two weeks. No card needed.

Features

All you need for gas pipework commissioning

Installation Volume Calculator

Calculate total installation volume across all meter types and pipe materials.

Learn more

Tightness Test Calculator

Complete tightness tests for new and existing UP1, UP1A and UP1B installations.

Learn more

Strength Test Calculator

Run strength tests for new UP1A and UP1 installations. Done instantly.

Learn more

Purging Calculator

Complete purging procedures for UP1, UP1A and UP1B installations.

Learn more

Report Generation

Generate a detailed PDF report on site and share it straight from your phone.

Learn more

Input & Output Information

Everything is explained. Tap the ⓘ icon to know exactly what any input/output value means.

Learn more

Search Topics

Built for commercial gas testing, tightness testing and UP1 workflows

If you're looking for a commercial gas testing app, a tightness testing app, or a tool for UP1B, UP1A or UP1 gas testing, Tivy is built for exactly those jobs.

Commercial Gas Testing App

Tivy is a commercial gas testing app for UK engineers carrying out tightness, strength and purging workflows on site.

See the full workflow

Tightness Testing App

Use Tivy as a tightness testing app for new and existing installations, with guided inputs and report-ready outputs.

View tightness testing

UP1B Gas Testing (Edition 4)

Tivy supports UP1B tightness testing and purging for gas engineers.

Explore UP1B testing

UP1A Gas Testing

Tivy supports UP1A gas testing across tightness, strength and purging procedures, with outputs ready for reports.

Explore UP1A testing

UP1 Gas Testing

Tivy supports UP1 gas testing workflows and helps turn calculations and test results into completed commissioning records.

Explore UP1 testing

FAQ

Common questions

After your two-week trial, Tivy Commercial is £59.99/year or £8.99/month, and Tivy Domestic is £4.99/year. No card is needed to start the trial.

Not currently — but we're working on it. Get in touch if you'd like to be notified when team plans are available.

No. Tivy works fully offline once installed. An internet connection is only needed to create your account and download the app.

Yes. Tivy is designed around current gas testing and commissioning practices for UP1, UP1A and UP1B installations.

Yes. Tivy is a commercial gas testing app built for UK gas engineers carrying out tightness tests, strength tests and purging procedures on site.

Yes. Tivy includes a guided tightness testing workflow for new and existing UP1, UP1A and UP1B installations, with instant results ready for your report.

Yes. Tivy supports UP1B gas testing workflows, including the relevant tightness testing and purging procedures used during commissioning.

Yes. Tivy supports UP1A and UP1 gas testing workflows, including strength testing, tightness testing, purging checks and report generation.

Tivy helps you generate test results quickly, but final sign-offs and commissioning reports should always be completed to industry standards and follow your required compliance process.

No. Tivy gives you the results you need to make that determination — it does not pass or fail a test on your behalf. All results should be verified by a competent professional.

Just minutes. Download the app, create your account and you're ready to go — no setup or training required.

Tivy is faster, more consistent and removes the risk of calculation errors. All the maths is handled for you so you can focus on the job.

Ready to Get Started?

Download Tivy today and join hundreds of gas engineers making their work easier.

Download on App Store Download on Play Store

Try Tivy free for two weeks · No card needed