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Want a free API Key? You’re almost there!

If you want to play around with our API, please visit the API Documentation interactive pages: you do not need an API key for this.

If you would like to make direct REST calls, please fill in the sign-up form below. You will receive your API key right away.

With your free API key, you get access to all endpoints and functionalities of the Retina API based on the principle of fair use. This means that heavy usage might be throttled or limited in some way. See also our terms of service.

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Once your key is active, you will need to attach it to the http header with every call to the API. The name of the variable is api-key.


curl -X GET -H "api-key: your-API-key" ""

You will receive an email message containing your free API key shortly.

Before you get started, we recommend that you have a look at our documentation.

It contains a Quick Start guide for the REST API and the client SDKs for Java, Python and Javascript,
as well as explanations about working with terms, text, semantic expressions and images, as well as a similarity metrics guide, video tutorials and more.

If you have any questions, do not hesitate to contact us via our user forum.