An API with endless possibilities.

With visual conversational AI avatars like our API gives you, anything is possible: mock interviews, sales assistants, language training, coaching, CS training, historical characters and so much more.

Key Concepts


All endpoints require an API key which you can easily obtain by creating an account at Create an account. The API key makes it easier for you to track your usage and control who has access to Simli.


All our available Avatar faces can be accessed by using the /getPossibleFaceIDs endpoint. We are continously adding new ones.


We currently use elevenLab voices, so you will have plenty of options to choose from. You can get a list of voices from our /getPossibleVoiceIDs endpoint.

Interaction Prompts

The interactable avatars started using the /startSession endpoint require a prompt to be entered. This prompt controls the behaviour of the avatar when speaking with a user. You can adjuts the prompt as needed.


Here are some resources to get you started