Concepts

A high-level overview of what Leash is, how deployment works, and the building blocks you will use.

What is Leash?

Leash is a platform-as-a-service (PaaS) built for apps created with AI coding tools like Claude Code, Cursor, and Codex. One command to deploy, managed databases, and pre-built integrations with services like Gmail, Slack, HubSpot, Linear, and more.

In short

Write code with AI, run leash deploy, and your app is live with HTTPS, a database, and third-party integrations — no DevOps required.

How Deployment Works

Run leash deploy in your project directory.
Leash auto-detects your framework (Next.js, Flask, Express, Go, Docker, static HTML).
Preflight checks run locally to catch errors before uploading.
Your code is built into a container and deployed to Leash infrastructure.
You get a URL: https://your-app.un.leash.build

How Integrations Work

Connect once on the dashboard — use from any app.
Per-user OAuth or API key authentication, stored securely.
Two types: REST SDK clients (Gmail, Calendar, Drive) with full typed methods, and MCP-based integrations (HubSpot, Slack, Linear, etc.) with auto-generated typed packages.
Install a package, initialize the SDK, call methods.

SDKs

Available in six languages. All packages are published to their respective registries.

TypeScript

Python

Ruby

Rust

Java