Parse WebVTT, SRT, or TTML for conformance, timing, overlaps, line length, and reading speed.
Free
Scanned where there is a package or repository to read, and every release diffed against the tool surface we already hold.
Parse WebVTT, SRT, or TTML for conformance, timing, overlaps, line length, and reading speed.
Run EPUBCheck for EPUB specification errors and compare two exports.