 Winston AIThe tool you are replacing |
You are here |
$10/mo billed yearlyEssential, $10 billed yearly ($120) or $18 billed monthly; list price, WINSTON50 code shows 50% off |
2,000 credits, 14-day trial |
AI text, image and deepfake detection with OCR |
— |
13 Nov 2026 |
Pricing ↗ |
 GPTZero Zekai score 6.3Best overall |
Free plan + paid |
$12.99/mo billed yearlyPremium, billed yearly or $23.99 billed monthly; Professional $24.99 yearly or $45.99 monthly |
10,000 words a month, 1 free Advanced scan |
Teachers wanting sentence highlights at scale |
— |
13 Nov 2026 |
Pricing ↗ |
|
Free plan + paid |
$12.95/mo billed yearlyPro, billed yearly or $14.95 billed monthly; Enterprise $136.58 yearly or $179 monthly |
10K words (100 credits) one time; comparison table says 60 credits renewing daily |
Publishers vetting freelancer articles in bulk |
— |
13 Nov 2026 |
Pricing ↗ |
|
Paid |
$13.99/mo billed yearlyPersonal, billed yearly or $16.99 billed monthly; Pro $74.99 yearly or $99.99 monthly |
No free plan |
Plagiarism plus AI checks bought by credit |
— |
13 Nov 2026 |
Pricing ↗ |
|
Free plan + paid |
$8.99/mo billed yearlyPro, billed yearly ($107.88) or $14.99 billed monthly; Plus $13.99 yearly or $21.99 monthly |
Free forever at $0; character cap not stated on the pricing page |
Cheap pro tier with batch checks |
— |
13 Nov 2026 |
Pricing ↗ |
IIsgen Zekai score 7.3Cheapest paid |
Paid |
$8/mo billed yearlyAcademic, billed yearly or $14 billed monthly; Ultimate $24 yearly or $40 monthly |
No free plan |
Low-cost academic detector with plagiarism check |
— |
13 Nov 2026 |
Pricing ↗ |
|
Free plan + paid |
$14.99/moEssential, from (monthly); yearly price not shown on the page. Professional from $29.98 |
AI detector up to 1,000 words; plagiarism checker up to 1,000 words |
Plagiarism checker and AI detector bundle |
— |
13 Nov 2026 |
Pricing ↗ |
|
Paid |
$20/moIndividual, monthly after a 7-day $0 trial (annual saves $60 a year); Professional $65 monthly (annual saves $240) |
No free plan |
Accuracy-focused detector with usage API |
— |
13 Nov 2026 |
Pricing ↗ |
 Scribbr Zekai score 7.5Best free plan |
Free |
Free plan; paid price not publishedPremium AI Detector: no price shown on page |
Unlimited free AI checks, no sign-up; word cap not stated |
Students wanting a no-sign-up free check |
$0 |
13 Nov 2026 |
Pricing ↗ |
|
Paid |
Not checkedInstitutional quote only, no public price |
No free plan |
Institution-wide similarity and AI writing checks |
— |
13 Nov 2026 |
Pricing ↗ |
|
Open source |
Free (self-hosted) |
No limit, self-hosted (MIT) |
Self-hosted multi-engine AI text detector |
$0 |
13 Nov 2026 |
Code ↗ |
|
Open source |
Free (self-hosted) |
No limit, self-hosted (BSD-3-Clause) |
Zero-shot detection you run yourself |
$0 |
13 Nov 2026 |
Code ↗ |
|
Open source |
Free (self-hosted) |
No limit, self-hosted (MIT) |
Zero-shot detection from an ICLR 2024 paper |
$0 |
13 Nov 2026 |
Code ↗ |
|
Open source |
Free (self-hosted) |
No limit, self-hosted (MIT) |
Academic-paper AI detection with a small model |
$0 |
13 Nov 2026 |
Code ↗ |
|
Open source |
Free (self-hosted) |
No limit, self-hosted (Apache-2.0) |
Watermark detection for text you generate |
$0 |
13 Nov 2026 |
Code ↗ |