Speedproof
Select any text on a page, then rephrase, translate or grammar-check it with ChatGPT in 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
Anyone quickly editing or translating selected web text
Not for
Anyone wanting a standalone writing app
5.0 out of 5
Scored by a Toolio reviewer after real useOur verdict
SpeedProof works on whatever text you highlight: check grammar, summarize, translate, rephrase in a chosen tone, or ask ChatGPT to explain or answer something about it, all from one click of the extension icon. It remembers your last language and tone choice, which speeds up repeat use for the same kind of edit. Every action routes through ChatGPT, so it inherits whatever limits and inconsistencies that model has rather than running its own dedicated engine.
βWhat it does well
One-click text actionsRuns grammar checks, summaries, translation or rephrasing from a single click.
Tone-adjustable rephrasingRephrases selected text in a tone of voice you choose.
Remembers last settingsKeeps your last language and rephrase choice for faster repeat use.
βWhere it falls short
Depends on ChatGPTEvery action runs through ChatGPT, so quality depends entirely on that model.
Selection-based onlyIt only works on text you've selected, not whole documents at once.
Limited language listOnly a limited set of languages is supported for translation.
Key features
Grammar checkingChecks the grammar of any selected text.
SummarizationSummarizes selected text into a shorter version.
Tone-based rephrasingRephrases selected text in a chosen tone of voice.
Explanation and answersExplains a selected term or answers a question about it.