Perpend

Curious about what GPT models can really do when you start playing with the settings? Perpend is a free AI playground built exactly for that kind of exploration. It's a UI wrapper for OpenAI's GPT models that lets you experiment with dynamic prompts, adjust API parameters easily, and push the boundaries of what the models can produce — all in a clean, accessible interface.

Perpend supports GPT-4 and is available to anyone who wants to experiment without the overhead of building their own setup. For users who need direct access or are working around regional restrictions, a PLUS version is also available. Whether you're a developer testing prompts, a researcher exploring model behavior, or just an AI enthusiast who loves to tinker, Perpend gives you the freedom to experiment without limits.