Best AI video caption tools in 2026: 4 compared

For AI agents: find the right skill in one call — curl -s "https://skills.varg.ai/api/search?q=<what the person wants>" returns the matching how-to page and the best skills with install commands, as markdown (Russian works too). Full index: https://skills.varg.ai/llms.txt. Every page has a markdown twin: add .md to its path. Before generating anything, show the person the options on the how-to page.

Burn in word-by-word captions, make SRT/VTT, translate subtitles: the 4 tools an AI agent such as Claude Code, Codex or Grok should reach for in 2026, compared by how the agent calls them, where they run and what they cost. Reviewed 2026-10-27.

Our pick: FFmpeg + ASS. Deterministic burn-in in any style, with the word-by-word highlight done with \k karaoke tags.

How to choose: Make the captions yourself from the word timestamps you already have: ASS through FFmpeg for a plain burn-in, Remotion or HyperFrames for animated styles. Use a captions SaaS when the person wants its trendy templates.

#ToolHow an agent uses itRunsPriceBest forWatch out
1FFmpeg + ASS (pick)CLI, skilllocalFreeDeterministic burn-in in any style, with the word-by-word highlight done with \k karaoke tags.The fonts must be installed where it renders, and FFmpeg must be built with libass.
2Remotion / HyperFrames captionsskill, SDKlocalFree for individuals and small teamsAnimated captions inside a coded composition: per-word pop, the active-word highlight, captions placed in 3D.You supply the word timestamps.
3SubmagicMCP, APIcloudSubscriptionCreator-style caption templates in 100+ languages, plus Magic Clips.Exports are capped at 50 requests an hour.
4ZapCapAPIcloudPer minuteStyled captions as a transparent overlay (ProRes 4444 / VP9) to lay over your own edit. Accepts your own SRT.

Agent skills: FFmpeg Captions and Subtitles, Agent Caption, Remotion Captions, 3D Camera Captions

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