Custom plugin and browser extension development
WordPress and WooCommerce plugins, Shopify apps and Chrome, Edge and Firefox extensions, built cleanly, securely and ready for their marketplaces.
Why this is worth doing properly
Sometimes the software you use does almost everything you need. A plugin or extension adds the missing piece, without replacing a system your team already knows. It can also be a product in its own right, sold or offered free on a marketplace to reach users where they already are.
We build plugins and extensions that follow each platform's rules and coding standards, so they pass review, stay compatible with updates, and do not slow down the site or browser they run in.
Who this is for
- ✓Businesses that need a feature their WordPress, WooCommerce or Shopify site cannot do
- ✓Software companies that want a browser extension for their product
- ✓Founders launching a plugin or extension as a product
- ✓Teams relying on an abandoned plugin that needs replacing
- ✓Companies automating repetitive work in the browser
What's included
WordPress and WooCommerce plugins
Custom plugins built to WordPress coding standards, with settings pages, blocks, shortcodes, and checkout or product extensions.
Shopify apps
Custom and public Shopify apps and theme app extensions, using Shopify's APIs and billing.
Browser extensions
Extensions for Chrome, Edge and Firefox built on Manifest V3, with popups, side panels and page integrations.
Integrations
Connections to your CRM, payment provider, AI models or internal systems through their APIs.
Marketplace submission
Listings, screenshots, privacy details and submission to the WordPress directory, Shopify App Store or browser stores.
Maintenance
Compatibility updates when the platform changes, plus bug fixes and new features on a support plan.
Security and performance first
A plugin runs inside someone else's website and an extension runs inside someone's browser, so mistakes affect far more than your own code. We validate and escape all input and output, ask only for the permissions the feature needs, and load code only on the pages that use it.
That keeps sites fast, protects users' data, and makes marketplace reviews much smoother.
Keeping up with platform changes
WordPress, Shopify and the browsers change their rules regularly: Chrome's move to Manifest V3 is a recent example that broke many older extensions. We build on current standards and offer a maintenance plan that tests and updates your plugin or extension when platforms change.
Plugin or custom build?
If you need something many other businesses also need, an existing plugin may do the job and we will tell you so. A custom plugin makes sense when the feature is specific to how you work, when existing options are slow or insecure, or when the plugin is your product.
How a plugin or extension project runs
We agree the scope on a free call and send a fixed quote. You then get a test version to install on a staging site or your own browser after each milestone. Before release we test against the platform versions your users run, prepare documentation and settings help, and, for marketplace products, set up the listing, support contact and update process.
What it costs
Every project gets a fixed quote in writing before any work starts. We quote in USD, GBP or EUR.
Plugins and browser extensions start from $1,000. Each one is scoped on a free call and quoted as a fixed price. Marketplace submission, documentation and a support plan can be included.
Not sure what you need? Try the package calculator.
From first call to launch, in four steps
1. Free discovery call
30 minutes to understand your goals, your customers and what is not working today.
2. Fixed quote and plan
A written scope, timeline and fixed price, so you know the full cost before work starts.
3. Build and review
You see progress early and often, and give feedback while it is still cheap to change.
4. Launch and support
We test, launch, check tracking and stay on hand during the post-launch window.
Plugin & Extension Development: answered
Plugins and extensions start from $1,000. The final price depends on what it needs to do, so we scope it on a free call and send a fixed quote before work starts.
Chrome, Edge and Firefox, and other Chromium-based browsers. Extensions are built on Manifest V3.
Yes. We prepare the listing and handle submission to the WordPress directory, Shopify App Store or browser extension stores.
Yes. We can fix an existing plugin, or build a cleaner replacement and migrate its data.
No. We load code only where it is needed and test the effect on page speed before release.
You do. The code and marketplace listings are yours, published under your own developer accounts.
You might also need
WordPress & WooCommerce Development
Business websites and online stores on WordPress that are fast, secure and easy for your team to update, built for firms in the USA, UK, Canada and Europe.
Learn more →Shopify Development
Custom Shopify stores for brands in the USA, UK, Canada and Europe. Clean product pages, a checkout that does not leak sales, and a store your team can run without calling a developer.
Learn more →Desktop App Development
Cross-platform desktop applications built with Electron or Tauri: installers, auto-updates, offline work and sync with your systems.
Learn more →Tell us what you need. We'll tell you what it takes.
Book a free 30-minute call. You'll get honest advice and a fixed quote, with no obligation.