Aspen - Your API’s Best Friend 4+

Aspen is a new, groundbreaking HTTP client built by Treblle. It allows you to make HTTP requests to your REST-based APIs seamlessly and with ease.

AI-powered: Once you make an HTTP request, Aspen can generate data models, integration code, and more in any programming language based on that request. This allows you to seamlessly move from testing APIs to integrating them in seconds.

Private by default: Aspen doesn't require an account to get started, nor does it send any data to our servers. You can use Aspen completely anonymously without worrying about someone getting access to your API data. All data, including request history, is stored locally on your Mac.

Blazing fast: Aspen is a native app for Apple Silicon devices built in SwiftUI. It consumes ten times less memory and CPU than any other API testing app.