Yes! Open Prompt Registry is completely free to use. You can browse, copy, and contribute prompts without any cost.
Simply sign up for an account, click on the "Add Prompt" button, and fill out the form. Your prompt will be instantly available to the community.
Most prompts are shared under permissive licenses (like MIT or CC0), but please check the specific license attached to each prompt if applicable. In general, the output generated by AI using these prompts is yours to use.