Side by side
Copyleaks AI Detector vs Dolos
Both stand on plagiarism checkers. Which one you can start free with, which one lets you read the code, and what each costs once you pay.
Free plan APIExtensionSelf-hosted+1
Copyleaks combines multilingual AI-text detection with explanations, integrations, and an API. Its scan requirements and plan limits are worth checking against the size and workflow of the material you need to review.
Visit Copyleaks AI Detector Free plan Open source APILinuxMac+3
Dolos focuses on similarities between source code submissions, with reports that show overlap at the file-pair level. Its web app, API, CLI, and self-hosting options give educators different ways to use it.
Visit DolosThe facts
| Copyleaks AI Detector | Dolos | |
|---|---|---|
| Free plan | Yes | Yes |
| Open source | Not published | Yes |
| Runs on | API, Extension, Self-hosted, Web | API, Linux, Mac, Self-hosted, Web, Windows |
| Lowest paid plan | See the plans | Free or on request |
| Plans published | 8 | 2 |
| Maker | Not published | Not published |
| Website | copyleaks.com | dolos.ugent.be |
| On plagiarism checkers | #3 of 31 | #1 of 31 |
Copyleaks AI Detector: what it does well
- Detects AI writing in more than 30 languages.
- AI Logic explains flags and AI phrase frequency.
- Scans up to 25,000 characters without login.
- Chrome, Edge, and Google Docs integrations are available.
- API access and batch scanning are available.
What to know first
- Website scans require at least 255 characters.
- Browser extension scans require 350 to 25,000 characters.
- Enterprise and Education pricing is custom.
Dolos: what it does well
- Free plan and MIT-licensed open-source software
- Reports show overlap and longest matching fragments
- Supports common programming languages through Tree-sitter
- Offers JSON API and local analysis options
- CSV listed as a report export format
What to know first
- Public API ZIP submissions are limited to 10 MB
- Mixed-language ZIPs analyze only the dominant language by default
- No academic source matching listed
Alternatives to Copyleaks AI Detector Alternatives to Dolos The whole list