Specsplain Chrome Extension
Turns dense TC39 spec language into plain-English explanations with one click.
At a glance
Starts at
Free
No paid plan found on the Chrome Web Store, September 2026.
Free tier
Yes
Platforms
Chrome
Best for
Developers reading ECMAScript technical specifications
Not for
Anyone reading specs outside ECMAScript
3.9 out of 5
Scored by Alex after real useOur verdict
Specsplain adds an Explain button to TC39 specification pages that hands the underlying algorithm to Google's PaLM AI and returns a plain-language explanation. It's built for developers wading through ECMAScript's notoriously dense spec language rather than general documentation. For now it only works on the ECMAScript spec, so anyone reading a different technical specification gets no help from it.
✓What it does well
One-click explanationsExplains a spec's algorithm with a single button click.
Plain-language outputTurns dense technical wording into a human-readable explanation.
Built for a known pain pointTargets the specifically dense language of the TC39 specification.
✕Where it falls short
ECMAScript onlyIt currently only works on the ECMAScript spec, not other specifications.
Depends on PaLM outputExplanation quality depends entirely on Google's PaLM model.
No ratings yetThere are no ratings on record, so accuracy is unverified.
Key features
Explain buttonAdds an Explain button directly to the spec document.
PaLM-powered explanationsUses Google's PaLM AI to generate the explanation text.
Algorithm breakdownsBreaks down a spec algorithm into readable language.
ECMAScript spec supportWorks specifically with the TC39 ECMAScript specification.