About Crowdin Apps

Extend Crowdin and Crowdin Enterprise with your own apps: add features to the interface, connect external services, and process content.

Build a Crowdin app with your AI coding agent:

Help me build a Crowdin app. Do the following:
1. Install the Crowdin plugin with npx plugins add crowdin/skills.
2. Ask me what the app should do, then use the create-app skill to scaffold, develop, and publish it.
3. After publishing, open a preview so I can see the app inside Crowdin.

To an end user, an installed app appears as a fully integrated part of Crowdin, with its features delivered straight to the UI.

Choose How to Build

There are two ways to build a Crowdin app. Serverless apps run on Crowdin infrastructure: you write the UI, and Crowdin hosts and runs the app. Self-hosted apps run on a server you operate, which lets them use every module type, including those with server-side logic. Neither approach replaces the other. Pick the one that matches what your app does.

Serverless Apps

Build dashboards, panels, and other UI modules that run on Crowdin infrastructure. You scaffold, preview, and publish the app from the CLI, with no server to deploy or maintain.

Choose this path when your app is all interface: it displays data, extends the Crowdin UI, and calls the Crowdin API on behalf of the person using it.

Get started with Serverless Apps

Self-Hosted Apps

Build an app backed by your own server, using any language and framework. This path supports every module type, including file processing, AI providers, and custom MT engines.

Choose this path when your app needs server-side logic: it processes files, reacts to webhooks, connects external services, or acts with the permissions of the account that installed it.

Follow the Quick Start

	Serverless Apps	Self-Hosted Apps
Hosting	Crowdin runs your app	You deploy and run your app
Modules	UI modules	All module types
API calls	Made as the user working in the app	Made as the account that installed the app
Stack	TypeScript, with React and the Crowdin UI Kit preconfigured	Any language and framework

If your app combines an interface with server-side logic, build it as a self-hosted app. Self-hosted apps can include UI modules as well.

Explore the Docs

App DescriptorThe JSON file that declares what your app is and which modules it adds.

Crowdin Apps SDKBuild a self-hosted app in just a few lines of code.

UI ModulesPanels, dashboards, menus, and other placements in the Crowdin UI.

File Processing ModulesCustom file formats, import and export processing, and bundle generators.

AI ModulesCustom AI providers, prompt providers, and processors for AI requests.

Crowdin APIEndpoints for files and strings, translations, TMs, glossaries, and reports.

Crowdin Apps JSThe AP object your app uses to talk to the page it runs on.

App InstallationHow apps are installed and who in your account can use them.

Examples of Crowdin Apps

Start from a template instead of an empty project:

Serverless Apps Starter Kit: The templates the serverless CLI scaffolds, and a complete serverless app to read end to end.
Crowdin AI Provider Template: A self-hosted app that adds a custom AI provider, built with the Crowdin Apps SDK.
Crowdin Custom MT Template: A self-hosted app that adds a custom machine translation engine.
Crowdin Custom File Format Boilerplate: A file processing app that adds INI, CONF, and CFG support, with a preview for translators.

Publishing to the Crowdin Store

When the app is ready to share, submit it to the Crowdin Store, where other users can find and install it.

Case Study

See how the LexiQA integration was built as a Crowdin app:

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