Category · 13 tools · 7 comparisons
AI content detectors
Tools that flag AI-written text for editors, publishers and SEO teams, compared on credits, accuracy claims and false-positive handling.
At a glance
- Tools tracked
- 13
- Entry plans
- $8.33–$125/mo
- Typical entry plan
- $12.95/mo
- Free plan
- 9 of 13
- Cheapest paid
- QuillBot, $8.33/mo
- Best value score
- Sapling, 7/10
Every tool we cover
Price tracker →| Tool | Score | From | Top listed plan | Free plan | Trial | Pages |
|---|---|---|---|---|---|---|
 SaplingSapling | 7.0 | $12/mo | $12/mo | Yes | 1 month | Review |
 GrammarlyGrammarly | 6.5 | €12/mo | €12/mo | Yes | 2 days | ReviewPricingAlternatives |
 iThenticateiThenticate | 6.4 | $125/mo | — | No | — | ReviewPricingAlternatives |
 QuetextQuetext | 6.4 | $14.99/mo* | $29.98/mo | Yes | — | Review |
 PangramPangram | 6.2 | $20/mo | $45/mo | No | 7 days | ReviewPricing |
 QuillBotQuillBot | 6.0 | $8.33/mo* | $8.33/mo | Yes | — | ReviewPricingAlternatives |
 SmodinSmodin | 5.9 | $10/mo* | $16/mo | No | — | Review |
 Originality.aiOriginality.ai | 5.8 | $12.95/mo | $136.58/mo | Yes | — | ReviewPricing |
 GPTZeroGPTZero | 5.8 | $12.99/mo* | $24.99/mo | Yes | — | ReviewPricingAlternatives |
 DupliCheckerDupliChecker | 5.7 | $9.17/mo | $200/mo | Yes | — | ReviewAlternatives |
 CopyleaksCopyleaks | 5.4 | $13.99/mo | $74.99/mo | No | — | ReviewPricing |
 Winston AIWinston AI | 5.4 | $10/mo | $26/mo | Yes | 14 days | ReviewPricing |
 ZeroGPTZeroGPT | 5.4 | Free* | — | Yes | — | ReviewAlternatives |
* Lower confidence: the vendor's pricing page couldn't be read directly or didn't list every price, so the figure was compiled from other public sources and may be incomplete. Check the vendor's page before you buy.
Head-to-head
Highest scored
SaplingSapling
Broad writing and developer tools, with detector caps and little relevant public feedback to weigh.
GrammarlyGrammarly
Good free proofreader, but Pro's rewrites and prompts cost more than most casual writers say they're worth.
iThenticateiThenticate
A specialized similarity tool; individual credits cost $125–$300 and exclude AI detection.
AI content detectors: quick answers
How much do AI content detectors cost?
Paid plans for the 13 AI content detectors we track start between $8.33 and $125 a month, and the typical entry plan is about $12.95 a month. 9 of them have a free plan. Prices are the vendors' own, checked Nov 7, 2026; most quote the per-month price when billed annually.
Which AI content detector is the cheapest?
QuillBot has the lowest paid entry plan at $8.33 a month, followed by DupliChecker at $9.17. If you can live with limits, Sapling, Grammarly, Quetext and QuillBot have a free plan.
Which AI content detectors have a free plan?
Sapling, Grammarly, Quetext, QuillBot, Originality.ai, GPTZero, DupliChecker, Winston AI and ZeroGPT have a free plan. Pangram offers a free trial instead. Free plans are usually capped on usage, seats or features; each review lists the limits.
Which AI content detector scores highest in our reviews?
Sapling scores highest at 7.0/10. Broad writing and developer tools, with detector caps and little relevant public feedback to weigh.