Write like a human.
Even when AI helped.
Check a draft for the phrases that read like a machine, then fix the ones that matter. The check is free with no daily limit and no signup — it runs on our own statistical engine rather than a language model, so it costs us nothing to give away.
Free to try · No signup · UK-registered company
Pick the workflow that matches why you came.
Show intent first, keep free value obvious, and find the paid path when volume grows.
Check detection risk, humanize essays, fix grammar.
Start here if your main job is essays, assignments, and study writing.
- AI Detector
- AI Humanizer
- Grammar Checker
Draft faster, rewrite cleaner, publish with confidence.
Run every draft through the detector before it ships, then rewrite what it flags.
- AI Detector
- AI Humanizer
- AI Rewriter
Start free, then upgrade when the workflow becomes daily.
The free tier keeps the product useful from day one. Paid plans add more throughput, better modes, and cleaner writing workflows when usage becomes serious.
- Starter / Pro
- Stripe billing
- Browser-first start
AI Humanizer
Natural-Sounding Writing
Transform AI-generated text into natural, human-sounding content that reads better in academic, professional, and everyday contexts. Choose from 9 writing modes to match your context.
- 9 modes — Standard, Academic, Blog, Formal, Simple + 4 premium
- Targets the stylistic tells our own detector scores — sentence-length variance, connector density, lexical uniformity
- Preserves meaning — changes how it sounds, not what it says
The detector reports the AI patterns it finds, sentence by sentence. A low score means no machine-like pattern stood out — never that a human wrote it.
See our published error rates →AI Detector
Know Before You Ship
Check any text for AI patterns in a browser-first workflow. Open the detector in the web app, run a first pass, then keep revising inside the same tool family.
- Detector starts in the web app with a lower-friction first review pass
- Statistical model — zero API cost, instant results
- Humanize + Detect workflow — write, check, iterate
Use Coda One wherever you write.
Take the Humanizer and Detector into your browser workflow instead of bouncing between tabs.
Chrome Extension for AI writing
Humanize, detect, and refine text directly inside your usual workflow.
- Use Coda One in docs, email, LMS, and CMS workflows without copy-paste loops
- Run Humanizer and Detector side by side while you edit and review final copy
- Keep your browser workflow fast with one-click access instead of tab switching
Simple, honest pricing.
The AI Detector stays free with no daily limit. Upgrade for higher AI writing capacity.
Start the first task in your browser before account setup
Card checkout is simple and self-serve
Lower-risk upgrade path for paid plans
- AI Detector — unlimited, free
- 3 AI writing uses / day
- 5 humanizer modes and 5 rewriter tones
- No signup for the first run
- 30K words/month
- Every Humanizer and Rewriter mode
- 500 words/process
- Email support
- 100K words/month
- No per-request word cap
- 3 brand voices
- Email support
- 500K words/month
- No per-request word cap
- Unlimited brand voices
- Everything in Pro
One product, multiple workflows.
Coda One does one thing seriously: the full AI-writing workflow, from detection to final polish.
Unlimited Free AI Detector
Check as many drafts as you want, every day, no signup. Our detection engine costs us nothing to run, so we do not ration it.
vs. guest limits of 3 scans/day elsewhereDirect-Use Start
Open the page and start the first task in your browser. No extension setup before the first run.
vs. Monica requires Chrome extensionPublished Accuracy, Not Marketing
We publish our real false-positive and false-negative rates, and the text types we get wrong. Detection is evidence, not proof — we say so.
vs. unverifiable 99% accuracy claimsDetect, Then Fix — One Flow
A high AI score comes with the fix one click away: send the flagged draft straight into the Humanizer with your text carried over.
vs. standalone detectors that stop at the scoreThe complete writing toolchain.
Detect, humanize, rewrite, and polish — every step of a serious draft, in one place.
Ready when you are
Tomorrow's first draft
starts tonight.
Write it, humanize it, detect it, ship it — without bouncing between tabs. Free to start, upgrade only when volume grows.
Sign up free - no card required →