Plugmark: PAT Testing Register

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About this app

Plugmark is a PAT testing register for the tester who cannot afford to lose a result. Record each test on site, retest quickly next year, and hand over a register or certificate as a PDF.

Your data is yours, not ours. There is no account and no sign-in. Everything you enter stays on your phone and in the backups you save. Overpass never receives it.

NEVER LOSE A TEST
- Every field saves as you type.
- If the app is closed or the phone restarts halfway through a test, the draft is offered back when you return.
- A backup file is made on your phone each day you use the app, and the last 7 are kept.
- Save backup to Files in one tap, to iCloud Drive, Google Drive or any folder you choose. Restore from file whenever you need it.
- Your phone's own device backup carries your data too.

CLIENTS, SITES AND APPLIANCES
- Keep clients, their sites and every appliance in one register.
- Asset numbers are issued for you per site. You can edit them, and duplicates are flagged.
- Class I, Class II and Class III, with categories such as IT equipment, kitchen, power tool, extension lead, portable and handheld.

THE TEST RECORD
- Formal visual inspection, earth continuity, insulation resistance, and protective conductor or touch current.
- Polarity and functional check as pass or fail ticks.
- Pass limits are filled in with commonly used defaults and applied for you, and you can change any limit. The limit used is stored with each test.
- Pass or fail is worked out from your readings. Add notes and a photo of the appliance.
- Record your test instruments and their calibration due date. You are warned when a calibration is out of date.

FAST RETESTS
Copy the last test, change the readings, swipe to the next appliance. A running count shows how many you have done this visit. A suggested next test date comes from the type of appliance and you can change it.

DUE SOON
See what is overdue or due in the next 30 days, and which items failed and must not be used until retested. Switch on one reminder 14 days before a site is due.

REGISTER AND CERTIFICATES
- Register PDF for a site, and a visit certificate PDF with your signature.
- CSV export of your register for a spreadsheet.
- Your company name, logo and signature are printed on the PDFs.
- Send everything with the share sheet.

PRICE
Plugmark is free for up to 25 appliances. Plugmark Pro removes the limit and is a subscription with no free trial.
- Monthly: 3.99 pounds a month.
- Yearly: 29.99 pounds a year.
Everything you have already recorded stays free to open, test, export and back up, always. Only appliance 26 onwards needs Pro.

Subscriptions are billed through Google Play and can be cancelled in Google Play at any time.

Privacy policy: https://overpass.co.uk/mobile-apps-privacy-policy/

IMPORTANT
Plugmark is independent software from Overpass Limited. It is not affiliated with the IET, the HSE or any trade body or certification scheme. The default pass limits and retest intervals are suggestions based on published guidance, and you set the limits and intervals for your own work. You remain responsible for the accuracy of every test you record and for working to current guidance.

Made by Overpass Limited, a small UK software company.
Log PAT tests, retest fast, send PDFs. No account, data stays on your phone.
Updated on
Oct 30, 2026

Data safety

Safety starts with understanding how developers collect and share your data. Data privacy and security practices may vary based on your use, region, and age. The developer provided this information and may update it over time.
  • No data shared with third parties
    Learn more about how developers declare sharing
  • No data collected
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What’s new

First release. A PAT register that never loses a test: autosave, fast retest, register and certificate PDFs, CSV export, daily backup.