ShortFast

ShortFast writes scripts, generates faceless or AI UGC short videos with voiceover and captions, and auto-publishes them daily to TikTok, Reels and YouTube Shorts. Built for faceless channels, agencies and businesses, with a REST API and MCP server.

ShortFast is an AI video automation platform for short-form content. It starts from a topic or a pasted script, writes the hook and script when none is supplied, picks a voiceover, assembles visuals, burns in captions and then publishes the finished video to TikTok, Instagram Reels and YouTube Shorts on a daily schedule. Output falls into two families: faceless videos built from licensed stock footage, AI b-roll or AI images, and UGC-style videos fronted by AI actors. The audience is people who need a steady stream of vertical video without long-form footage to cut from: faceless channel operators, agencies handling several client accounts, and businesses using short video for lead generation. Creation begins in a composer where the user describes a video or pastes a script, then chooses a niche, voice, format and b-roll style. A b-roll editor pairs each script line with a clip, and selecting a text segment allows swapping, trimming, looping or muting it beside a live vertical preview. Voices number over 50, and an AI presenter can be placed on any line and mixed with b-roll in the same video. Visual direction comes from 27 styles, including documentary footage, stick figures, cartoon explainer, anime, dark mystery and marble statues. Each style also sets pacing and music. Captions use word-by-word highlighting with nine presets and inline editing, including per-line timing and emoji. The scheduling side offers daily or up to three-times-a-day posting, calendar and timeline views, multiple profiles and accounts, and an auto-refill option that tops up the queue. Everything is also exposed through a REST API, webhooks and an MCP server for AI agents. Among alternatives, clipping tools such as OpusClip start from an existing recording, while ShortFast starts from a topic and carries the process through to publishing. That positions it closer to a channel automation system than to a general video editor. Plans are tiered by monthly video count, number of automations and connected social accounts, so heavy multi-brand use pushes buyers toward the higher tiers.