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Speedproof

Select any text on a page, then rephrase, translate or grammar-check it with ChatGPT in one click.

Checked 3 Oct 2026 Reviewed by Alex Listed since September 2024

Screenshot of Speedproof

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 Alex after real use

Our 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.

βœ“What 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.

βœ•Where 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.

Questions about Speedproof

What can you do with Speedproof?

Speedproof works on any text selected on a web page, letting users check grammar, summarize, translate, rephrase in a chosen tone, or ask ChatGPT to explain or answer something about it. Each action runs from one click of the extension icon in Chrome.

Is Speedproof free?

Speedproof is free, listed at $0, and no paid plan was found on the Chrome Web Store in September 2026. It runs as a Chrome extension, and Toolio marks it as having a free tier.

Does Speedproof use ChatGPT?

Yes. Every Speedproof action routes through ChatGPT rather than a dedicated engine of its own, so the reviewer notes it inherits whatever limits and inconsistencies that model has. Quality depends entirely on the output ChatGPT gives.

What are the limitations of Speedproof?

Speedproof only works on text that has been selected, not on whole documents at once, and only a limited set of languages is supported for translation. Toolio also lists anyone wanting a standalone writing app as a poor fit for the extension.

How does Toolio rate Speedproof?

Alex scored Speedproof 5.0 out of 5 after real use on 3 Oct 2026. The reviewer praises its one-click text actions and tone-adjustable rephrasing, and notes that it remembers the last language and tone chosen, which speeds up repeat edits.

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