What a driving test extension actually does
It sits in your browser on the official booking site and does the typing and the checking you would otherwise do by hand. Here is the whole job, including the parts it leaves to you.
Last updated: 13 September 2026
A browser extension, not a booking service
A driving test extension is a small add-on for Google Chrome that only wakes up on the DVSA's practical test booking site. Nothing happens on a server somewhere. The searching happens in a tab on your own computer, signed in as you, with your details stored on your own device.
Driving Test Helper is one of these. You install it from the Chrome Web Store, type your details into its panel once, press Start and leave the tab open. From then on it behaves like a very patient version of you.
What it does on the booking page
- Types your details. Licence number, test type and centre area go into the DVSA form for you, every time it starts a fresh search, so you never type them again.
- Checks your centres. It works through the centres in your postcode area, or only the ones you named, on the dates and times you set, then waits and goes again. The pauses between checks are deliberately realistic.
- Opens the slot and sounds an alarm. When a slot matches, it selects it, which is what makes the booking site hold it for 15 minutes, plays a loud alarm, shows a notification and stops.
The recording on the homepage shows all three steps on the real site, and the setup guide walks through the settings.
Where it stops
The hand-over is the point of the design, so it is worth being exact about it.
- It never pays for or confirms a booking. You check the date, the centre and the time, then pay on the DVSA site yourself.
- The security check and the CAPTCHA are yours to solve. It tells you when one is waiting and does nothing to get round it.
- It makes new bookings only. It cannot move, swap or cancel a test you already hold. If you want to start again, cancel on GOV.UK first.
- It is an independent tool, not affiliated with or endorsed by the DVSA or any government body.
Extension or cancellation app?
Most cancellation apps work from their own servers. They spot a slot and send you a notification, and then it is your turn: open the booking site, sign in, type the form and get to the slot before someone else does. Some go further and book on your behalf, which means giving your licence details to someone else's system and letting it act for you.
An extension keeps everything on your device. The form is already filled in and the slot is already open when the alarm goes, so the race is one click rather than a sign-in. The trade-off is that your computer has to stay on with the tab open, which is why the Android app exists: a phone on a desk with the app in front does the same job without tying up a laptop.
Neither kind of tool can invent a cancellation. Both can only catch one that appears at the centres you chose, on the dates you chose.
Chrome, and an Android app
The extension needs Google Chrome on a desktop or laptop. It does not run in Edge, Firefox or Safari. The Android app loads the same booking site inside the app and runs the same automation, with the same settings.
One purchase of £10 unlocks both, on the email address you paid with, for up to two licence numbers. There is no subscription.
About getting blocked
The booking site has its own bot protection and will sometimes show a security check, or block a session that searches too quickly. The default timings are paced to avoid that, the status line tells you when a check needs solving, and if it cannot make progress five times in a row it stops itself rather than hammering a stuck session. Nothing here gets round the check for you, and nothing should.
Where to go from here
- Add the extension to Chrome, or get the Android app.
- Read what it does, and where it stops on the homepage.
- Already bought it? Open the setup guide.