Category
AI plagiarism checkers: what they are and who makes them
credit and subscription checkers, pay-per-document tools, institutional integrity suites, writing assistants and desktop apps: Plagramme, Originality.ai, Copyleaks through Viper.
Types of AI plagiarism checkers
Credit and subscription checkers
Plagramme, Originality.ai, Copyleaks and Quetext sell monthly plans measured in words or credits, with the AI detector in the same pool. They suit writers, agencies and publishers who scan every week and want browser extensions, bulk uploads or an API, and who accept a monthly word cap in exchange.
Pay-per-document tools
Scribbr, Viper, PlagAware, StrikePlagiarism and PlagiarismSearch charge for each check or sell prepaid credits and packages. They fit a student with one thesis, or a freelancer who checks a few pieces a year and would rather pay per document than commit to a plan.
Institutional integrity suites
Turnitin and Compilatio sell to schools and universities through demos and quotes, with LMS connections and instructor controls. Prices are not published on the pages we read, and individual buyers usually cannot sign up directly without a school or institution behind them.
Writing assistants and desktop apps
Grammarly adds plagiarism and AI detection to a Pro subscription, while Plagiarism Checker X ships a Windows app and a one-time licence. Both suit people who want detection close to their editor or desktop, and not a reporting platform with team dashboards or audit trails.
Facts at a glance
| Tool | Publisher | Based in | Access |
|---|---|---|---|
| Plagramme | Lingua intellegens, UAB | Lithuania | Paid |
| Originality.ai | Originality AI Inc. | Canada | Trial + API |
| Copyleaks | Copyleaks, Inc. | Not stated on the vendor pages | Trial + API |
| Quetext | Quetext Software LLC | Not stated on the vendor pages | Free tier + API |
| PlagiarismSearch | System Technology Online Spain SL | Spain | Paid + API |
| Scribbr | Scribbr (legal entity name not stated on the pages read) | Netherlands | Free tier |
| PlagAware | PlagAware GmbH | Germany | Free tier + API |
| Compilatio | COMPILATIO, SAS | France | Trial + API |
| StrikePlagiarism | Plagiat.pl sp. z o.o. | Poland | Paid + API |
| Plagiarism Checker X | Plagiarism Checker X, LLC | United States | Free tier |
| Grammarly | Grammarly (legal entity not named on the pages read; privacy policy sits under Superhuman legal pages) | Not stated on the vendor pages | Free tier |
| Turnitin | Turnitin, LLC | United States | Paid |
| Viper | Business Bliss Consultants FZE | United Arab Emirates | Trial |
