Writing & AI tools / AI content detector8 tools
Best AI content detectors
Estimate whether a text was written by AI. Facts come from each tool's own pages, and every score says where it comes from. How we rank
- Tools
- 8
- Researched
- 5
- Free option
- 2
- Only listed
- 3
Disclosure: agathox makes some of the tools listed here. They are labelled and scored by the same method as every other tool.
Ranked by signals we can measure or quote: website health, the facts each tool's own pages state, and community discussion. Nothing here has been hands-on tested yet, so this is not a quality test. How the signals rank works
Want two of these head to head? Compare tools side by side.
Details and sources
- Free tier
- Free plan gives basic writing help and AI detector checks up to 2,000 characters per check, 20 snippets, 5 files per detector batch, on free domains only. Advanced suggestions, Autocomplete and Rephrase are not included.
- Paid plan
- Pro is $25 per month, or $12 per month billed annually, with AI detector checks up to 100,000 characters and 10 files per batch. API is usage-based with a $5 one-time minimum. Enterprise starts at 10 seats at $15 per seat per month.
- Signup
- An account is required for the Pro trial and subscribing. Not stated for the free plan.
- Watermark
- Not stated.
- Where files go
- Privacy policy says content is stored by Sapling and used only to improve the service, and services are hosted in the United States. No retention period is given.
From the tool's own pages, checked 2026-11-01. Sources: Pricing, Privacy policy. Prices and limits change; check the tool before you rely on them.
Details and sources
- Free tier
- Only a free trial limited to 250 words is described. More use needs a paid plan.
- Paid plan
- 10K words per month: $9.99 monthly or $5.00 per month billed yearly ($60 per year). 20K words: $19.00 monthly or $9.50 per month yearly ($114). 35K words: $31.00 monthly or $15.75 per month yearly ($189). 50K words: $42.50 monthly or $21.25 per month yearly. Business pricing is custom.
- Signup
- Not stated.
- Watermark
- Not stated. The pricing page lists a feature called 'Watermark and future proof' without explaining it.
- Where files go
- Privacy notice says data may be transferred, stored and processed in other countries, and kept as long as needed for its purposes. It does not describe how entered text is handled, and its server-location line is incomplete.
From the tool's own pages, checked 2026-11-01. Sources: Pricing, Privacy notice. Prices and limits change; check the tool before you rely on them.
Details and sources
- Free tier
- Not stated.
- Paid plan
- Not stated.
- Signup
- A free account is required for scans exceeding 10,000 characters. The page says: “For scans over 10,000 characters, create a free account first.”
- Watermark
- Not stated.
- Where files go
- Files are uploaded for review. The page says: “Paste Text or Upload Document: Paste in raw text or upload your file for review and press ‘Scan’.”
From the tool's own pages, checked 2026-11-08. Sources: Home. Prices and limits change; check the tool before you rely on them.
Read automatically by a program, not by a person. Each fact quotes the sentence it came from, and a fact is shown only if that sentence is on the page. Where a page did not say, it reads “Not stated.”
Details and sources
- Free tier
- Not stated.
- Paid plan
- Not stated.
- Signup
- An account is required to begin checking for AI content. The page says: “Create your account for free to begin checking for AI content.”
- Watermark
- Not stated.
- Where files go
- Not stated.
From the tool's own pages, checked 2026-11-04. Sources: Home. Prices and limits change; check the tool before you rely on them.
Read automatically by a program, not by a person. Each fact quotes the sentence it came from, and a fact is shown only if that sentence is on the page. Where a page did not say, it reads “Not stated.”
Details and sources
- Free tier
- Free plan at $0 for limited use: 10K words (100 credits, one time; 1 credit = 100 words). The comparison table instead shows 60 credits renewing daily, so the page is inconsistent. No file upload, PDF download, Deep Scan or API.
- Paid plan
- In USD: Pro $12.95/month billed yearly ($155.40/year) or $14.95/month billed monthly, 200K words/month. Enterprise $136.58/month billed yearly or $179/month billed monthly, 1.5M words/month. Extra team seats cost more.
- Signup
- Not stated clearly. The page offers a Continue for Free option and an FAQ says sign-up is needed for the full suite.
- Watermark
- Not stated.
- Where files go
- Privacy policy says submitted text is stored and processed on its servers and its providers' servers in Canada, the US and other places. Some features send text to OpenAI, which may keep logs up to 30 days. Scan history may be used to train models unless you opt out. Retention is as long as reasonably necessary.
From the tool's own pages, checked 2026-11-01. Sources: Pricing, Privacy policy. Prices and limits change; check the tool before you rely on them.
Answers come from each tool's own pages (“Unclear” means they do not say). Tick “Compare” on two to four tools to read them side by side.
Also listed (3, not yet tested)
Each of these answered when we visited its site. We have not tested them or recorded facts, so they are in alphabetical order, not ranked.
- CopyleaksOpen
Copyleaks is listed for: plagiarism checker, ai content detector.
- TurnitinOpen
Turnitin is listed for: plagiarism checker, ai content detector.
- ZeroGPTOpen
AI Content Detector and ChatGPT Detector, simple way with High Accuracy. AI Checker & AI Detector Free for AI GPT Plagiarism by ZeroGPT.
Other Writing & AI tools rankings
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