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Side-by-side features, use cases and pricing — because the right pick depends on your job and budget, not just the ranking.
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Plagiarismsearch.com
✓ verifiedFreemium
Plagiarism and AI-detection checker for universities and organizations with API, LMS plugin, and chatbot integrations.
66K visits/mo
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LanguageTool
✓ verifiedFreemium
AI grammar and style checker with paraphrasing, available across browsers, email, office apps and as an API.
7.6M visits/mo5.0K saves
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Goodnotes
✓ verifiedFreemium
Tablet-first note-taking app blending handwriting, PDF markup, typed docs and AI search for students and professionals.
2.4M visits/mo1.5K saves
Pricing
Single Check: $9.95 one-time
Basic Package: $17.95
Light Monthly: $22.95/mo
Standard Monthly: $34.95/mo
Light Yearly: $114.95/yr
Standard Yearly: $174.95/yr
No public pricing
Free: $0 (3 notebooks, 100MB storage)
Essential: $11.99/yr (unlimited notebooks, 5GB, basic AI)
Pro: $35.99/yr (advanced AI features)
AI Add-on: +$10/mo (full AI)
Free trial available
Core features
- ✦Plagiarism detection against a large source database
- ✦AI-generated content detection
- ✦Paper structure and quality analysis
- ✦Readability and spelling checks
- ✦API and Moodle LMS plugin integration
- ✦Chatbot access via Viber and Telegram
- ✦Grammar and spelling checking
- ✦Style and tone suggestions
- ✦Paraphrasing tool
- ✦Browser, email and office add-ons
- ✦Proofreading API
- ✦Business/GDPR-conformant options
- ✦Handwriting with convert-to-text
- ✦PDF annotation and markup
- ✦Typed documents and infinite whiteboard
- ✦AI search and summaries across notes
- ✦Audio recording and transcription
- ✦Cross-device sync and real-time collaboration
Use cases
- →Universities screening student submissions for originality
- →Teachers verifying academic integrity of assignments
- →Organizations checking content authenticity at scale
- →Integrating plagiarism checks into an existing LMS via API
- →Proofread and correct writing
- →Rephrase sentences
- →Maintain consistent tone across a team
- →Handwritten study and lecture notes
- →Marking up contracts and reports
- →Team brainstorming on shared whiteboards
- →Capturing and organizing meeting notes
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