Extensions for Chrome, Edge and Firefox that work inside the sites your team or customers already use, from £50 one-off. Two of our own are live in the stores, so you can try our work before you ask.
Read what is on the page, fill in forms, add buttons and panels, or tidy up a tool your team uses every day.
People sign in from the extension with the accounts they already have on your system, using a secure sign-in flow.
The extension calls your API, or one we build with it, so the clever parts and the data stay on your server.
Subscriptions, credits or a usage balance, with billing handled on your account site rather than inside the browser.
A small panel in the toolbar for signing in, switching features on and off, and showing what the extension is doing.
One codebase on the current Manifest V3 standard, packaged for each browser and its store.
Publishing: like our mobile apps, we can put your extension on the Chrome Web Store, Firefox Add-ons and Edge Add-ons under our company accounts if you prefer. Or you can use your own developer accounts and we publish it under your name.
We built, publish and run these ourselves. They share one sign-in, one API and one billing system, the same pieces we can build for you.
A browser extension that helps with maths homework.
A browser extension that automates repetitive Kay Science homework tasks.
Sites, features and data agreed
We agree which sites it works on, what it should do there and what it needs from your systems. You approve the plan before any code is written.
A test build every week
Work happens in one-week rounds. Each week you get a test build to load into your own browser and try on the real sites.
Listings, privacy and review
Store listings, screenshots, a privacy policy and the permission notes each store asks for, then submission and review.
Chrome, Edge, Firefox and other Chromium browsers such as Brave and Opera, from one codebase. Safari is possible too, but Apple ships extensions inside a Mac or iPhone app, so we quote it as a separate build.
A simple extension that does one job on one site, packaged for Chrome, Edge and Firefox and submitted to their stores. It suits a small tool for your team or a first version you want to test.
More sites or features, sign-in, payments, or a backend for it to talk to. We plan these with you, then send a fixed price in writing before any work starts.
Yes. It can be unlisted, so only people with the link can install it, or rolled out to your company's browsers by your IT team without going through a public listing.
Extensions that read another site's pages can break when that site is redesigned. We build them to fail safely and tell the user, and we can keep yours updated after launch.
We ask only for the permissions the extension needs, and only for the sites it works on. Every store needs a privacy policy; we write it with you and can host it for you.
Yes, all three. Like our mobile apps, we can publish it under our company on the Chrome Web Store, Firefox Add-ons and Edge Add-ons, so you don’t need developer accounts of your own. Or you can use your own (Chrome charges a one-off $5 to register; Firefox and Edge are free) and we publish it under your name.
Yes. You get the complete source code, the build scripts that package it for each browser, and notes on how it all fits together. There is no lock-in.
A few lines on which sites it should work on and what it should do there is enough. We reply within one working day.