Winston AI (gowinston.ai) is an online AI detector that launched on January 28, 2023[1], and claims to have a 99.98% accuracy rate when checking AI content.[2] The website targets educators and companies seeking to verify that writing is human-generated.
Pros
- 0 false positives in our testing.
Cons
- Failed to detect 3 of 7 “humanized” texts.
Features
- AI detector (text)
- AI image detector
- Plagiarism checker
- Writing feedback
- Fact checker tool
- HUMN-1 website certification
- Chrome extension
- API
Pricing (4 options)
| Free Plan | Essential Plan | Advanced Plan | Elite Plan |
| 14-day free trial (no credit card required) | $18/month or $120/year | $29/month or $192/year | $49/month or $312/year |
| 2,000 credits | 80,000 credits | 200,000 credits | 500,000 credits |
| All features are included except plagiarism detection and shareable reports. | All features are included except plagiarism detection. | All features included, plus invite up to 5 team members. | All features included, plus invite an unlimited number of team members and an option to purchase “top-up” credits. |
1 Credit =
- AI Detection: 1 credit per word
- Plagiarism Detection: 2 credits per word
- Writing Feedback: 1 credit per word[4]
- Image Detection: 300 credits per image
Testing False-Positives
We used 10 popular blogs to test for false-positives (a false-positive is an essay that is written by a human but flagged as “AI”).
| Article URL | Test Result | Proof |
| The Volokh Conspiracy | 99% Human |  |
| Heather Cox Richardson (Substack) | 99% human |  |
| Everywhereist.com | 99% human |  |
| WaitbutWhy.com | 100% human |  |
| MaggieAppleton.com | 95% human |  |
| Seth’s Blog | 99% human |  |
| RibbonFarm | 99% human |  |
| CupofJo.com | 99% human |  |
| AstralCodexTen.com | 99% human |  |
| TheLastPsychiatrist.com | 98% human |  |
Testing AI Humanizers
Due to the high-use of AI humanizers, there is little reason to conduct AI tests against text copy and pasted directly from ChatGPT or Claude. Instead, there is more value in conducting real world tests against the most popular humanizers.
For our test, we asked ChatGPT to create an 850 word article about the Great Barrier Reef. We copy and pasted the generated text through Winston AI and predictably gave a 1% human score (see image).
However, when testing against AI humanizers, 3 of 7 humanized texts passed Winston’s AI detection.
| AI Humanizer | Post-Humanized Text | Test Result | Proof |
| StealthGPT.ai | .txt | 63% human |  |
| WriteHuman.ai | .txt | 99% human |  |
| Undetectable.ai | .txt | 1% human |  |
| StealthWriter.ai | .txt | 99% human |  |
| WalterWrites.ai | .txt | 99% human |  |
| ai-text-humanizer.com | .txt | 12% human |  |
| (Clever AI) AiHumanizer.net | .txt | 0% human |  |
Frequently asked questions (6)
Do unused credits carry over?
No, Winston AI does not allow credits to carry over. This means a user’s profile is reset at each billing period.[3]