Comparison
| Tool | Price from | Free plan | Category |
|---|---|---|---|
 Resemble AI | 1,000 USD/mo | trial | AI detectors |
 ZeroGPT | not listed | yes | AI detectors |
 AI or Not | 5 USD/mo | yes | AI detectors |
 GPTZero | not listed | yes | AI detectors |
 Turnitin | not listed | ? | AI detectors |
 Undetectable AI | 5.00 USD/mo | trial | AI detectors |
 Copyleaks | 13.99 USD/mo | trial | AI detectors |
 Originality.ai | 12.95 USD/mo | yes | AI detectors |
 Pangram | 20 USD/mo | trial | AI detectors |
Each alternative in short
1. ZeroGPT
Online AI content detector that flags AI-written text and images, plus paraphrasing, grammar and plagiarism tools for writers, students and educators.
Yes, there is a free plan. Free plan, no credit card needed, with limited access to the tools (the 15,000-character limit shown on the homepage applies to the detector input).
2. AI or Not
Detects AI-generated text, images, music, video and deepfakes, for individuals and businesses via web or API.
Yes, there is a free plan. 5 USD in free credits, 1M words of AI text detection per month, 20 AI image checks and an API key included.
3. GPTZero
Free AI detector that scores text for AI-generated content, sentence by sentence, for educators, students and writers.
Yes, there is a free plan. Free basic AI detection by pasting text into the scanner; the homepage advertises it as free. Paid features are not detailed in the provided text.
4. Turnitin
Academic integrity platform that detects plagiarism and AI-generated writing and supports grading and feedback for schools and universities.
The vendor does not state this clearly on the homepage or pricing page.
5. Undetectable AI
Detects AI-generated text and images and rewrites AI writing so it reads as human, for students, writers and professionals.
There is a free trial. Free trial limited to 250 words; additional usage requires a paid plan.
6. Copyleaks
Detects AI-generated and plagiarized text, images, and video, mainly for schools, publishers, and enterprises protecting content and IP.
There is a free trial. Free start for students (Start for Free / Start now for free); scan credits are limited on the individual plans.
7. Originality.ai
AI detector and content checker that flags AI-generated text and plagiarism for writers, editors, teachers and publishers.
Yes, there is a free plan. Basic plan with AI detection only: 3 scans per day, limit of 2,000 words per scan, file upload (docx, pdf, doc). No subscription required.
8. Pangram
AI detector that flags text and images likely generated by ChatGPT, Claude, Gemini and other models, for educators, publishers and organizations.
There is a free trial. Free tier with limited free scans (3 image scans per day shown); the Individual plan starts with a 7-day free trial.
FAQ
What is the best alternative to Resemble AI?
The most popular option in the same category is ZeroGPT. See the comparison table above.