Send and receive SMS messages in your applications with FreeClimb API.

Get Started

Build an application that receives an SMS message and sends a reply in just five easy steps.

Choose a Language

Build Your App

Explore FreeClimb's REST API, webhooks, and tutorials.

Learn More

Use one of our SMS guides to better understand FreeClimb messaging concepts.

Advanced Features

Implement two-factor authentication from a browser using SMS with FreeClimb.

Error Codes

Get details on error codes, possible causes, and solutions.

Error and Warning Dictionary