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bartleby
✓ verifiedFree trial
Subscription homework-help service with textbook solutions, expert Q&A and writing tools across many academic subjects.
758K visits/mo
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Grammarly
✓ verifiedFreemium
Widely used AI writing assistant offering grammar, tone and rewrite suggestions plus generative AI across apps; free tier available.
54M visits/mo
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GPTZero
✓ verifiedFreemium
AI-content detector aimed at educators, adding plagiarism, grammar and citation checks with claimed high accuracy.
17M visits/mo7.3K saves
Pricing
No public pricing
Free trial available
Free: $0
Pro: $12/member/mo billed annually (or $30/mo)
No public pricing
Core features
- ✦Expert Q&A with step-by-step solutions
- ✦Textbook solution library
- ✦Paraphrasing and grammar-checking tools
- ✦Concept explainers and literature guides
- ✦Flashcards and study resources
- ✦Real-time grammar, spelling and clarity checks
- ✦Full-sentence and paragraph rewrites
- ✦Tone and brand-style suggestions
- ✦Generative AI text with prompts
- ✦AI detector and humanizer agents
- ✦Works across apps, browsers and documents
- ✦Detects AI text from major LLMs (ChatGPT, Claude, Gemini, Llama)
- ✦Sentence-level highlighting with explanations
- ✦Plagiarism and grammar checking
- ✦Hallucination and citation verification
- ✦Authorship/writing-process verification
- ✦Integrations for Chrome, Google Docs, Canvas and API
Use cases
- →Getting homework and exam help
- →Finding worked textbook solutions
- →Proofreading and rewriting papers
- →Studying with flashcards and guides
- →Writing clear, error-free documents and emails
- →Adjusting tone for different audiences
- →Generating and rewriting text with AI
- →Maintaining brand voice across a team
- →Checking student work for AI-generated content
- →Verifying authentic authorship in classrooms
- →Screening submissions for publishers and recruiters
- →Detecting AI text through the API in other apps
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