The best working code, applied for you.
Couponly's free extension tests verified promo codes at checkout, applies the one that saves you the most, and tracks prices on products you watch — on Estonian and international stores alike.
Coming to the Chrome Web Store, Firefox Add-ons, and Microsoft Edge Add-ons.
A coupon tool that does the work itself.
Applies the best code
At checkout on a supported store, the extension tests our AI-verified codes against your real cart and keeps the one that lowers your total the most. No pasting codes one at a time.
Tracks prices for you
Watch a product and get an email when its price drops or it comes back in stock. On product pages we already know, price history shows up right where you shop.
Works where you shop
Estonian stores and international ones alike — the icon lights up wherever we have savings, and shopping on a store we don't cover yet helps move it up our onboarding queue.
Install once, save on autopilot.
- 01
Install & shop as usual
Add Couponly to your browser and keep shopping the way you always do. The icon lights up on stores where we have working codes — it stays quiet everywhere else.
- 02
Test codes at checkout
When you reach checkout, run the coupon test. The extension tries our verified codes in your cart and applies the one that saves you the most — you see the lower total before you pay.
- 03
Watch prices in between
Not buying today? Sign in and hit Watch in the popup. We check the price quietly in the background and email you when it drops to your target or the product is back in stock.
One extension, your browser of choice.
Couponly for Chrome
Coming to the Chrome Web Store — free when it lands.
Couponly for Firefox
Coming to Firefox Add-ons — free when it lands.
Couponly for Edge
Coming to Microsoft Edge Add-ons — free when it lands.
Built to know as little about you as possible.
Nothing sensitive, ever
No payment details, no keystrokes, no form contents, no raw page content. The extension reads catalog facts off product pages and discards the rest.
One server, ours
Everything the extension collects goes to couponly.ai and nowhere else — its background process refuses to send collected data to any other server.
Real off switches
Product-data sharing, price-history lookups, and crash reports each have a toggle in the extension's options. Off means off, immediately.
No account needed
Testing codes works fully signed out, and your savings total lives in your browser. Price watches are the one signed-in feature — sign in for those, and your watches and lifetime savings follow you across devices.
The full details — every signal, every switch — are in our Privacy Policy, written to match what the code actually does. For the bigger picture — how codes are verified, how offers are ranked, and who runs this — see why you can trust Couponly.
Stop pasting dead codes.
Add Couponly to your browser and let it find the working code at checkout — free, and out of your way.