CodaOne: AI Writing Assistant & Text Humanizer

Right-click any text to see what reads like AI, then rewrite it. Detect, humanize, rewrite, grammar check. Free, no signup.

Coda One puts the check-then-fix writing loop into your right-click menu, on any page. Select text, right-click, done — no tab switching, no pasting. WHAT IT DOES Detect AI — Names the exact phrases in your text that read like machine writing, and says why each one was flagged: hedging filler, formulaic transitions, stock openers, the flat rhythm language models fall into. You get the phrases, not just a percentage — the number is there if you want it, but it is the weakest thing we measure and we do not dress it up. Unlimited and free, no signup. It reads English-language writing style; it cannot assess Chinese, Japanese or Korean text, and it says so rather than returning a score it cannot stand behind. We publish its real error rates, including a 96% false-negative rate on our own benchmark, at codaone.ai/ai-detector/accuracy. Humanize Text — Rewrites flagged passages so they read like a person wrote them. Five modes free (Standard, Academic, Blog, Formal, Simple) and four more on a paid plan (Flowing, Informal, Expand, Shorten). We make no claim that it defeats any third-party detector: we have not been able to test against them, because their terms of service forbid automated evaluation, and we would rather say that than publish a number we invented. AI Rewriter — Says the same thing a different way, in the register you pick. Five tones free (Standard, Fluency, Formal, Casual, Concise), three more on a paid plan (Expand, Academic, Creative). Useful when the detector flags a passage but you would rather reword it than hand it to the humanizer. Grammar Check — Fixes grammar, spelling and sentence structure. Corrections replace your text in place where the page allows it, and copy to your clipboard where it does not (Google Docs, Notion, Overleaf). HOW IT WORKS 1. Select any text on any webpage 2. Right-click and choose a tool from the Coda One menu 3. Results appear in a floating bar at the bottom of the page Keyboard shortcuts: Ctrl+Shift+H to humanize, Ctrl+Shift+G to detect (Command+Shift on macOS). When in-place replacement is not possible, the result is copied to your clipboard automatically — press Ctrl+V to paste. FREE TIER - Detect AI: unlimited, no signup - Humanize: 3 uses per day - Rewrite: 3 uses per day - Grammar: 3 uses per day Each has its own allowance: 3 humanizes AND 3 rewrites AND 3 grammar checks a day, not 3 shared between them. Sign in at codaone.ai in the same browser and the extension picks up your session — a paid plan lifts the daily cap here too, not just on the website. Upgrade at codaone.ai/pricing for higher limits, premium writing modes and larger word limits. PRIVACY - Detect, Humanize, Rewrite and Grammar send the selected text to Coda One over HTTPS. Signed out, it is processed and not kept. Signed in, the input and result are saved to your account history, which you can delete from the dashboard. - We record which tool you used and when, so we can see how the extension is used. That record contains the tool name only — no text, no page content, no URL, no browsing history. - No ads. No data sold. - Full privacy policy: https://www.codaone.ai/privacy ABOUT CODA ONE Coda One is an AI writing platform: check a draft for AI tells, then fix what the check finds. We publish our detector's real error rates at codaone.ai/ai-detector/accuracy — including the cases it gets wrong.