Pika is an AI video generator from Pika Labs that creates short clips from text prompts, images or existing footage. It offers Pikaffects for physics-style effects, Pikadditions to insert people or objects into a video, Pikaswaps to replace elements, and lip sync and sound effects. It is used by social media creators, marketers and hobbyists making short-form video. Pika runs on the web and iOS with a free tier of credits plus paid plans, and its models are available to developers via an API.