TL;DR:
The three AI plagiarism checkers below performed the best in my tests. All of them accurately detected copied content and showed the exact source page where the content was found. They offer free trials as well as paid plans, making them worth trying.
Quick Overall Comparison Table
| Copyleaks | GPTZero | ZeroGPT |
|---|---|---|
| Test Accuracy Passed, 100% match detected | Test Accuracy Passed, 100% match detected | Test Accuracy Passed, 100% match detected |
| Free Access Type 5 one-time credits only | Free Access Type Permanent free plan, 10,000 words per month | Free Access Type Permanent free plan, no signup, no card |
| Starting Price $13.99/mo | Starting Price $8.33/mo | Starting Price $9.99/mo |
| Ads No ads at all | Ads No ads | Ads Ads present on free plan |
| Best For Institutions and professionals who want a clean, no-ads, all-in-one report | Best For Best all-round balance of free access, affordability, and accuracy | Best For Casual or occasional users who want instant free access with zero friction |
Quick Pricing Comparison Table to Clear Your Doubts
| Copyleaks | GPTZero | ZeroGPT |
|---|---|---|
| From $13.99/mo | Free, or from $8.33/mo | Free, or from $9.99/mo |
| Free Access 5 free credits only, no card needed, then must upgrade | Free Access Free Plan forever, 10,000 words per month, no card needed | Free Access Free Plan forever, no card needed, limit per scan varies by word or character count depending on version |
| Entry Plan Personal: $13.99/mo billed annually, or $16.99/mo billed monthly. Covers 300,000 words | Entry Plan Essential: $8.33/mo billed annually, or $14.99/mo billed monthly. Covers 150,000 words plus plagiarism check | Entry Plan Pro: around $9.99/mo. Covers 100,000 characters, ad free |
| Top Plan Pro: $74.99/mo billed annually, or $99.99/mo billed monthly. Covers 3,000,000 words | Mid Plan Premium: $12.99/mo billed annually, or $23.99/mo billed monthly. Covers 300,000 words, unlimited batch uploads | Mid Plan Plus: around $19.99/mo. Covers 60 batch files, 25,000 words for plagiarism check |
| Institution Plan Enterprise and Education: custom quote, contact sales | Top Plan Professional: $24.99/mo billed annually, or $45.99/mo billed monthly. Covers 500,000 words, API access, LMS integration | Top Plan Max: around $26.99/mo. Covers 150,000 characters, more integrations |
Copied Content for Testing
One good thing about PixVerse is that it supports almost every major type of AI video generation method. They also have their own video generation model, while additionally supporting some of the best external AI video models as well.
I tested their new PixVerse V6 mode, and the generated output followed around 90% of my prompt instructions accurately. The videos also included impressive elements like sound effects, slow motion, fast motion, cinematic camera angles, and realistic visuals. I’ll share the output so you can check it yourself.
Source: The content above was taken from the Kling AI Alternatives page on AlloyPress.
1. Copyleaks
In Copyleaks, you just need to paste your content and run the analysis. It quickly detected a 100% match and correctly showed 0% AI content because the content was written by a human. On the right side, it also showed the exact URL where the copied content was found.
The first attempt gave accurate results. There’s also a box on the right side that, when clicked, opens the full blog and highlights exactly where the copied content appears. It’s genuinely a useful tool. They also offer 5 free credits, and my test used 1 credit for one scan. You can export the results or share them when needed.
Did Copyleaks is pass the test
Yes, Copyleaks passed the test. It correctly detected the 100% plagiarized content and showed the exact domain and URL where the copied content was found. I was impressed with the results.
2. GPTZero
This tool is not completely free, but it offers a 7-day free trial. You need to enter your card details first and they give you 300K credits during the trial. I checked one piece of content for plagiarism and it used only 1 credit. I copied content from the AlloyPress website, pasted it into the tool and clicked Enter. Within a few seconds, it showed the plagiarism percentage on the right side and highlighted the exact lines that matched. It also provided the source URL for each match, which makes it very useful.
Did GPTzero is pass the test
Yes, GPTZero passed the test. It correctly detected the 100% plagiarized content and showed exactly which lines matched, along with the source links. It passed the test on the first attempt.
3. ZeroGPT
In ZeroGPT, you just need to paste the content and click “Detect Text.” Within a few seconds, it analyzed the content and correctly identified it as 100% copied, along with the source link where the match was found. The only downside is that there are quite a lot of ads, which can be a bit distracting. Other than that, the results were accurate on the first attempt. For the free version, you can check up to 300 words for plagiarism; anything beyond that requires a paid plan.
Did ZeroGPT is pass the test
Yes, ZeroGPT passed the test , it correctly detected the copied content and showed where it located page url
Pros & Cons Comparison Table:
| Copyleaks | GPTZero | ZeroGPT |
|---|---|---|
| Pros 100% accurate in testing, no ads, clean dashboard, exact URL matching, AI + plagiarism check | Pros Permanent free plan, no card needed, low starting price, plagiarism check, source links | Pros Free with no card or signup, fast to use, accurate in testing |
| Cons No permanent free plan, only 5 credits, expensive starting price | Cons Card required for trial, auto-charge after 7 days, 10K-word free limit | Cons Many ads, confusing scan limits, mixed accuracy in some tests |
Who Should Use Each Plagiarism Checker?
| Copyleaks | GPTZero | ZeroGPT |
|---|---|---|
| Who Should Use Institutions, universities, businesses, and professionals needing detailed, no-ads reports | Who Should Use Students, bloggers, writers, teachers, and regular users needing free access | Who Should Use Casual users, freelancers, and students wanting quick checks without signup |
| Not Ideal For Users wanting a free tool for occasional checks, as only 5 credits are available | Not Ideal For Users who do not want to provide card details for the trial | Not Ideal For Users who dislike ads or need larger checks on the free plan |
Conclusion
After testing 14 plagiarism checkers, these three performed the best overall. I’d recommend giving all three a try. GPTZero had a website loading issue after I finished my test, but that could be a temporary bug. Other than that, Copyleaks and GPTZero are definitely worth trying, while ZeroGPT also works well but can be a little irritating because of the number of ads
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