accessibility · free Companion App · local in this browser
Caption Timing Drift Checker
Compare the worst cue offsets with your tolerance and list which cues need retiming.
Enter your numbers
Enter only the details needed for this task. Check them against the original source.
Your result
Your result will appear here.
Engine self-test
Running golden cases…
Source notes
- World Wide Web Consortium, Web Accessibility Initiative — Captions
Captions provide text for speech and important sounds. Review automatic captions and correct errors before release.
Reviewed 2026-10-09. A checklist cannot certify legal compliance or replace review by people who use captions. Requirements depend on content and context.
What this App does not do
This App compares offsets you enter. It does not parse caption files, retime cues, or check player behavior.
This free App has no paid features. It does not contact an agency, employer, bank, seller, provider, or other person.