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Coda One vs QuillBot

An honest comparison to help you choose the right tool

Feature
Coda One
QuillBot
Rewriting modes
8 modes (5 free)
9 modes total; 3 on free (Standard, Fluency, basic Humanizer)
Free word limit
300 words/request, 3/day
125 words per paraphrase
AI Humanizer
Yes, dedicated tool (free)
Basic humanizer mode on free; Advanced on Premium
AI Detector
Yes, detector included
Yes, limited on free; unlimited on Premium
Grammar checker
Yes (dedicated tool)
Yes (built-in, real-time)
Summarizer
No
Free up to 1,200 words; Premium up to 6,000
Plagiarism checker
No
Premium only — 25,000 words/mo cap
Browser extension
Yes (Chrome extension, 4 writing tools)
Yes (Chrome, Edge, Firefox)
Languages
English only
23 paraphrase languages, 40+ translate languages
Pricing (monthly)
$9.99 / $19.99 / $39.99
Not published; annual billing only (quillbot.com/premium, checked 2026-08-29)
Pricing (annual effective)
$7.99 / $15.99 / $31.99 per month
$4.17/mo billed annually (checked 2026-08-29)

QuillBot figures checked against their own pricing and product pages on 28 August 2026. They change these often; if you are deciding on the strength of a row, check theirs too. Our own figures come from the running code — free limits from the tool API.

Why Choose Coda One?

4 Tools, One Page Each

AI Detector, AI Humanizer, AI Rewriter, Grammar Checker. One page per job, without a second subscription.

Generous Free Tier

All 4 tools open directly in the browser with no signup. The AI Detector has no daily limit; the other three give you 3 free uses a day.

Text Is Not Kept

Used anonymously, the text you submit is not stored after the response is generated, and it is never used to train models.

Guides Around the Tools

Plus, explore our AI scenario guides, MCP server resources, and agent skills to get more from your tools.

QuillBot is one of the most established paraphrasing tools on the market. It offers paraphrasing with 9 modes, grammar checking, summarization, and a citation generator. For pure paraphrasing, QuillBot's synonym slider and mode variety remain a meaningful advantage, but its free entry point is narrower.

Coda One is narrower on purpose. It is four tools: an AI detector, a humanizer, a rewriter and a grammar checker. The rewriter includes 8 modes with 5 available free at 300 words per request, and it sits next to an AI detector, an AI humanizer and a grammar checker.

Do not buy Coda One as a QuillBot replacement. If you paraphrase in 23 languages, summarize, generate citations, or rewrite inside Google Docs through their extension, we do none of it and there is no plan under which we will. QuillBot Premium at $4.17/mo on annual billing is about half our Starter tier's $7.99/mo annual rate, and it buys far more surface area. Choose Coda One for one specific job: a draft you already wrote reads as machine-written and you want to see which sentences carry the pattern. Our detector has no daily limit and no account wall at 3,000 words a check, where QuillBot caps detection on its free plan and lifts the cap only on Premium — No detector is always right — treat the score as a starting point, not proof. Paraphrasing is QuillBot's product. Sentence-level AI detection is ours.

Try It Yourself

See how Coda One's AI Rewriter compares in a browser-first workflow.

Try AI Rewriter Free

Frequently Asked Questions

How does Coda One compare with QuillBot for paraphrasing?
QuillBot stays stronger for users who care most about dedicated paraphrasing controls and multilingual support. Coda One is a better fit when paraphrasing is part of a workflow that also includes AI humanization and detector review.
How do the free entry points differ?
Coda One puts detector access next to the rewriter on the free tier, so you can check a draft before and after rewriting it. QuillBot keeps its free entry point centered on paraphrasing and extension convenience.
Does paraphrasing change a detector result?
QuillBot is a paraphrasing tool. Paraphrasing may change some phrasing. It is not designed to change a detector result. Coda One has a humanizer next to a free detector, so you can see which sentences still read as machine-written. We publish no pass rate against any third-party detector, because their terms forbid the automated testing that would produce an honest one.
Does QuillBot support more languages than Coda One?
Yes, significantly. QuillBot supports paraphrasing in 23 languages. Coda One's tools are English-only. If you regularly write in French, Spanish, German, or other languages and need paraphrasing in those languages, QuillBot is the better choice.
Does QuillBot check for plagiarism?
QuillBot includes a plagiarism checker on the Premium plan (up to 25,000 words per month) — no extra fee on top of the Premium subscription. It is not included on their free plan. Coda One has no plagiarism checker at all; we withdrew ours in August 2026 rather than keep running one that had stopped working. On plagiarism and on citation generation, QuillBot is the answer and we are not.
Who should pick Coda One over QuillBot?
Pick Coda One if the specific problem is that a draft reads as AI-written and you want to see which sentences carry the pattern; the detector is free with no daily limit. Pick QuillBot, and do not bother with us, if you work in languages other than English, need summarizing, citations or plagiarism checking, or want rewriting to happen inside Google Docs. Most people comparing these two want QuillBot.

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AI Writing: Humanizer · Detector · Rewriter