Copyleaks AI Detector vs SmallSEOTools Plagiarism Checker
Copyleaks AI Detector
copyleaks.comSmallSEOTools Plagiarism Checker
smallseotools.comSide by side
| Figure | Copyleaks AI Detector | SmallSEOTools Plagiarism Checker |
|---|---|---|
| Price from | $13.99/mo | $7.84/mo |
| Free plan | — | Yes |
| Free trial | Yes | — |
| Open source | — | — |
| Web | Yes | Yes |
| API | Yes | Yes |
| Self-hosted | Yes | — |
| Plans published | 12 | 4 |
| Spec score · Plagiarism Checkers | 9.2 (#1) | 7.9 (#14) |
| Spec score · Plagiarism Detection Software | 9.2 (#1) | 7.9 (#15) |
| Spec score · AI Plagiarism Checkers | 9.2 (#1) | 8.0 (#10) |
| API | The developer product is a REST API returning section-level human or AI classifications, an overall summary and explanations. | SmallSEOTools documents an API for plagiarism checks and account status; it says its APIs are currently only available for checking plagiarism. |
| Headquarters | New York, NY, United States | London, UK |
| Purpose | The AI Detector identifies AI-written text, including text blended with human writing. | The checker compares submitted text with online sources and returns a plagiarism report with matched sources. |
| Security | Copyleaks states that data is encrypted at rest with AES-256 and that it holds SOC 2 and SOC 3 certifications and supports GDPR compliance. | The product page says submissions are processed through a secure connection and used to generate the report, and says the work remains confidential after analysis. |
Plans
Copyleaks AI Detector
- PersonalPriced on request
- ProPriced on request
- Personal$16.99 a month
- Personal (monthly billing)$16.99 a month
- Pro$99.99 a month
- Pro (monthly billing)$99.99 a month
- Personal (annual billing)$167.88 a year
- Pro (annual billing)$899.88 a year
- EducationPriced on request
- EducationPriced on request
SmallSEOTools Plagiarism Checker
- FreeFree
- Monthly$9.80 a month
- Yearly$94.08 a year
- Enterprise & LMSPriced on request
In their own words
Copyleaks AI Detector
Copyleaks AI Detector identifies AI-written text, including writing that mixes AI and human passages. It supports more than 30 languages and names GPT-5, GPT-4, ChatGPT, Claude, Gemini, DeepSeek, Llama, Bloom, Rytr, and Jasper among the sources it detects. AI Logic explains flagged results, displays AI phrase frequency, and can identify text appearing in published content elsewhere. The web detector scans up to 25,000 characters without login; the website platform requires at least 255 characters and accepts up to 2,000 pages. A Chrome and Edge extension accepts 350 to 25,000 characters, and a Google Docs add-on and education LMS integrations connect it to other workflows. Personal costs $13.99 a year with annual billing or $16.99 a month; Pro costs $74.99 a year with annual billing or $99.99 a month. A free plan and free trial are listed. Copyleaks says data is encrypted at rest with AES-256, reports SOC 2 and SOC 3 certifications, and supports GDPR compliance.
SmallSEOTools Plagiarism Checker
SmallSEOTools Plagiarism Checker compares submitted text with online sources and returns a report identifying matches. Users can paste text, upload files from local or cloud storage, or check a URL. Upload formats include.doc,.docx,.txt,.tex,.rtf,.odt, and.pdf. Reports show duplication scores, exact and partial matches, flagged sentences, and source URLs. Quotations, references, and other properly attributed material can be excluded from the similarity score. The checker says it detects paraphrased content and synonym replacements as well as exact matches, and supports checks in more than 25 languages. Reports can be downloaded in PDF or Word format. The free plan allows up to 1,000 words per scan; paid plans start at $9.80/mo. An API is documented for plagiarism checks and account status, and a WordPress plugin checks content from the dashboard after an API is added in its settings. The product page says submissions are processed through a secure connection and remain confidential after analysis.