Compare tools
Side-by-side features, use cases and pricing — because the right pick depends on your job and budget, not just the ranking.
⇄ Comparison dimension — pick the market you're actually shopping in
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Kerlig AI
✓ verifiedPaid
Native macOS AI writing assistant for emails, Slack and docs; pay-once license with your own API keys across 350+ models.
29K 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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Scribbr
✓ verifiedFreemium
Academic writing platform combining human and AI proofreading, plagiarism checking, and citation generation for students.
7.3M visits/mo3.2K saves
Pricing
Basic: $49 one-time (1 Mac, 1 year of updates)
Pro: $79 one-time (2 Macs)
Team: $297 one-time (10 Macs)
No public pricing
No public pricing
Core features
- ✦System-wide AI via a global hotkey
- ✦Proofreading, rewriting and drafting
- ✦Chat with documents, webpages and images
- ✦350+ models via your own API keys
- ✦Local model support (Ollama, LM Studio, Apple)
- ✦Custom and built-in actions and presets
- ✦Grammar and spelling checking
- ✦Style and tone suggestions
- ✦Paraphrasing tool
- ✦Browser, email and office add-ons
- ✦Proofreading API
- ✦Business/GDPR-conformant options
- ✦Plagiarism checker using university-grade detection software
- ✦AI content detector for flagging AI-generated text
- ✦Human proofreading with roughly 3-hour turnaround
- ✦AI-proofreading that reviews a full paper in minutes
- ✦Citation generator supporting APA, MLA, Chicago, and more
- ✦Free paraphrasing, summarizing, and grammar-checking tools
Use cases
- →Fixing grammar and improving work messages
- →Drafting emails and Slack replies in your tone
- →Summarizing and querying documents
- →Using multiple LLMs from one Mac app
- →Proofread and correct writing
- →Rephrase sentences
- →Maintain consistent tone across a team
- →Students getting a paper proofread before submission
- →Checking a thesis or dissertation for unintentional plagiarism
- →Generating accurate citations in a required academic style
- →Detecting whether a document may read as AI-generated
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