Compare Kagi vs ProWritingAid vs Capacities
| Feature | Kagi | ProWritingAid | Capacities |
|---|---|---|---|
| Description | Kagi is a paid, ad-free search engine that includes Kagi Assistant for AI answers and research help. It is funded by its users rather than advertising, so you get focused results and AI help without tracking. | ProWritingAid helps writers improve grammar, style, and story structure with reports and AI rewrites. A free tier lets you start, and Premium plans add deeper critique tools for people finishing books and long documents. | Capacities is a notes and knowledge app built around objects and daily notes. The Basic plan stays free, and Pro adds AI assist so you can explore and connect ideas while keeping ownership of your knowledge base. |
| Pricing | Free trial of 100 searches; Starter $5/mo; Professional $10/mo; Ultimate $25/mo (annual discount available) | Free tier available; Premium about $30/mo monthly or $10/mo billed yearly ($120); Premium Pro about $36/mo monthly or $12/mo yearly; lifetime options listed | Basic free forever; Pro about $9.99/mo; Believer from about $12.49/mo |
| Main category | Chat assistants | Writing | Research and notes |
| Website | Visit Kagi | Visit ProWritingAid | Visit Capacities |
| Info last checked | October 17, 2026 | October 14, 2026 | October 13, 2026 |
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