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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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Rephrase
✓ verifiedPaid
macOS system-wide text rewriting tool triggered by hotkey, for grammar, tone shifts, translation, and formatting in any app.
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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
Lifetime: $49.99 one-time (discounted from $59.99), includes 50 free fixes to start
Free trial available
Free: $0
Pro: $12/member/mo billed annually (or $30/mo)
No public pricing
Core features
- ✦System-wide text transformation via custom hotkeys in any macOS app
- ✦Preset modes: formatting, reply drafting, translation, tone shift, summarizing
- ✦Custom user-defined rewrite prompts
- ✦'Lazy mode' that expands shorthand text into full sentences
- ✦One-time lifetime license with all future updates included
- ✦Local, privacy-focused processing (no training on user text)
- ✦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
- →Professionals quickly polishing Slack, email, or Notion messages
- →Non-native English speakers cleaning up grammar before sending
- →Users wanting a faster alternative to switching to ChatGPT
- →Anyone drafting quick messages who wants automatic tone adjustment
- →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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