Skip to main content
Cal.com’s app framework allows you to build custom integrations that extend the platform’s functionality. Apps can add new features, integrate with third-party services, and customize the booking experience.

​
What Are Cal.com Apps?

Apps are modular extensions that integrate with Cal.com’s core functionality. They can:
  • Add new calendar providers
  • Integrate with CRM systems
  • Add payment processing
  • Provide video conferencing options
  • Add analytics and tracking
  • Customize booking pages
  • Automate workflows

​
App Categories

Apps are organized into the following categories:
  • Analytics - Track and analyze booking data
  • AI & Automation - Automate workflows and add AI capabilities
  • Calendar - Connect external calendar services
  • Conferencing - Add video meeting providers
  • CRM - Integrate customer relationship management systems
  • Messaging - Connect messaging and notification services
  • Payment - Process payments for bookings
  • Other - General purpose apps

​
App Structure

Each app is a standalone package in the monorepo with the following structure: 
packages/app-store/your-app/
├── config.json          # App metadata and configuration
├── package.json         # Package dependencies
├── index.ts            # Main export file
├── api/                # API endpoints
│   ├── index.ts
│   ├── add.ts         # Install handler
│   └── webhook.ts     # Webhook handler (optional)
├── lib/               # Core business logic
│   ├── CalendarService.ts
│   ├── CrmService.ts
│   ├── PaymentService.ts
│   └── VideoApiAdapter.ts
├── components/        # React components
│   ├── EventTypeAppCardInterface.tsx
│   └── AppSettingsInterface.tsx
├── static/           # Static assets
│   └── icon.svg
├── zod.ts           # Zod schemas for validation
├── DESCRIPTION.md   # App store description
└── README.md        # Installation instructions

​
Key Files

​
config.json

Defines app metadata, categories, and configuration: 
{
  "name": "My App",
  "slug": "my-app",
  "type": "my-app_other",
  "logo": "icon.svg",
  "url": "https://example.com",
  "variant": "other",
  "categories": ["other"],
  "publisher": "Your Name",
  "email": "[email protected]",
  "description": "Short description (max 10 words)"
}

​
index.ts

Exports the app’s API and library modules: 
export * as api from "./api";
export * as lib from "./lib";

​
zod.ts

Defines validation schemas for app data and credentials: 
import { z } from "zod";
import { eventTypeAppCardZod } from "@calcom/app-store/eventTypeAppCardZod";

export const appDataSchema = eventTypeAppCardZod.merge(
  z.object({
    // Your app-specific settings
    enabled: z.boolean().optional(),
    credentialId: z.number().optional(),
  })
);

export const appKeysSchema = z.object({
  api_key: z.string(),
  api_secret: z.string(),
});

​
api/add.ts

Handles app installation and credential storage: 
import type { NextApiRequest, NextApiResponse } from "next";

export default async function handler(
  req: NextApiRequest,
  res: NextApiResponse
) {
  // Handle app installation
  // Store credentials
  // Return success/failure
}

​
Generated Files

The app-store CLI automatically generates several files that register your app:
  • apps.metadata.generated.ts - App metadata registry
  • apps.schemas.generated.ts - Schema exports
  • apps.server.generated.ts - Server-side API handlers
  • apps.browser.generated.tsx - Client-side components
  • calendar.services.generated.ts - Calendar service map
  • crm.apps.generated.ts - CRM service map
  • payment.services.generated.ts - Payment service map
  • video.adapters.generated.ts - Video adapter map
Never modify *.generated.ts files directly. They are automatically generated by the app-store CLI.

​
Development Workflow

  1. Create - Use the CLI to scaffold a new app
  2. Develop - Implement business logic and UI components
  3. Test - Test locally with yarn dev
  4. Build - Generate app registry files with yarn app-store:build
  5. Enable - Activate your app in /settings/admin/apps

​
Next Steps

Build Your First App

Step-by-step guide to creating a Cal.com app

App Store CLI

Command-line tools for app development

App Types

Learn about different app types and services

Contributing

Guidelines for contributing apps

Build docs developers (and LLMs) love

Get started for freeTalk to us