Polish any text on any page with a single AI click
This is our editors' assessment out of 5, not an average of user ratings. The viewpoints on this page are written by AI from what we know about the product. They are not customer reviews.
According to OpenAITools.app telemetry verified on 2026-11-11, Koko - Text Improver (chromewebstore.google.com) is an AI platform indexed under AI Rewriter generating 0 monthly visits with a month-over-month traffic delta of +0 (0.0%). Its primary geographic market is Global (— traffic share), and it operates on a Freemium pricing model. Top competing alternatives by monthly volume include QuillBot Paraphraser (36.63M visits/mo), Grammarly (58.87M visits/mo), LanguageTool (5.71M visits/mo).
Having to plug in my own API key just to test a tiny text rewriter is annoying.
Fast.
Sometimes messes up the formatting when replacing selected text in Gmail.
Decent grammar help.
AI-synthesized perspectives grounded in live site inspection, pricing structure, and category benchmarks — presented as editorial viewpoints rather than individual customer testimonials.
Select text on any page and click the inline 'Improve with Koko' button to have it rewritten instantly.
Uses large language models to tighten phrasing, fix awkward sentences and raise the overall quality of your writing.
Translate the improved text into other languages without leaving the page or opening a separate tool.
Because it acts on your text selection, Koko functions in Gmail, Google Docs, social networks and general web forms alike.
Copy the improved result with one click and paste it straight back into whatever you were writing.
Koko - Text Improver targets the small everyday writing moments that slow people down: a rushed email, a comment that reads awkwardly, a paragraph in a school assignment. Instead of opening a separate writing app, you highlight the text where it already lives and let the extension rewrite it in place. The interaction is deliberately minimal — a non-intrusive button appears next to your selection, you click once, and the improved text is ready to copy.
Beyond pure rewriting, Koko includes a built-in translation step so the same selection can be moved into another language, which makes it useful for people who correspond across languages. The developer states that text is processed securely and is not stored or reused, and the Chrome Web Store listing discloses that no user data is collected or sold.
The extension is distributed free on the Chrome Web Store but requires you to supply your own API key to unlock full functionality, so the practical cost depends on whichever AI provider you connect. It was last updated in September 2024, has a small user base and no ratings yet, which is worth keeping in mind if you need long-term support guarantees. It works on virtually any site because it operates on your selection rather than integrating with specific editors.
Rewrite a hurried draft message in Gmail so it reads polished and professional before you hit send.
Select paragraphs in an online document and get clearer phrasing suggestions while you study.
Tighten posts and replies on LinkedIn, X or other feeds directly in the composer.
Improve a sentence and translate it in the same step when writing to people in another language.
Side-by-side telemetry comparison of competing AI tools in the same primary category
| Rank | AI Tool | Monthly Visits | MoM Growth | Direct traffic share | Pricing | Head-to-Head |
|---|---|---|---|---|---|---|
| ● | Koko - Text Improver | 0 | — | — | Freemium | Current |
| 1 | QuillBot Paraphraser | 36.63M | +2.3% | 30% direct | Freemium | vs QuillBot Paraphraser |
| 2 | Grammarly | 58.87M | -1.5% | 43% direct | Freemium | vs Grammarly |
| 3 | LanguageTool | 5.71M | -4.2% | 57% direct | Freemium | vs LanguageTool |
| 4 | Just Rewrite | 5.51K | +49.1% | 40% direct | Freemium, Free Trial | vs Just Rewrite |
| 5 | Linguix | 227.4K | -4.5% | 55% direct | Freemium | vs Linguix |
| 6 | Wordtune | 368.77K | -5.8% | 52% direct | Freemium, Free Trial | vs Wordtune |
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