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How to use the Developer plugin

Create custom functionality inside your app using HTML, CSS, and JavaScript, with optional AI-generated code for rapid development.

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Written by Support
Updated this week

The Developer plugin gives you full control to build lightweight, single-page features directly inside your app. It uses your custom HTML, CSS, and JavaScript and supports interactions with installed features through the SDK. This plugin is designed for simple, embedded tools — not full plugin development.

Best Suited For

Not Recommended For

Simple, single-page plugins that rely on your app functionality

Plugins with large or complex logic

Informational or static content (e.g., announcement pages)

Framework-based projects (e.g., Angular, React)

Lightweight interactive tools (calculators, converters)

Multi-page plugins

Quizzes, trivia games, countdown timers

Plugins requiring control-side interaction or datastore access (control SDK only)

Feedback, rating, or survey pages

Plugins needing background services (App background services)

Visual or design experiments for quick testing

Plugins requiring new native device features not already installed (Developer plugin cannot request features)

UI previews or layout mockups

Pages interacting with a few APIs (retrieve/save data)

Plugins interacting with installed native features (camera, local notifications)

Requirements

  • This is a Maximize plugin, available on specific plans only.

  • Adding custom code is performed at your own risk.

How to use the Developer plugin

  1. Log in, go to Builder in the left navigation

  2. Click the + button to open the Plugin Marketplace

    • Search for Developer, then click Add Plugin

    • Name your plugin and choose whether to add it to the side menu, then click Add again

  3. Acknowledge the custom-code warning

    • Confirm that all code and issues are owned by you

    • Accept that the app does not provide support for custom code

  4. Stay in the Content tab. Choose how you want to build your code:

    • Create your own code

      1. Write HTML, CSS, and JavaScript directly in the code editor.

      2. Toggle Auto-Run off if you prefer manual execution

      3. Use the SDK Docs to access available app functions

    • Use Create with AI

      1. Click Create with AI

      2. Describe what you want built

      3. AI will generate editable HTML/CSS/JS for you. This may take a few minutes.

      4. Continue to use the AI function to make changes.

Pro tips

  • There is no versioning in this plugin; you must manually back up your code

  • The App Preview may not reflect live device behavior, so always test on a physical device

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