Compare Gemini CLI vs ProWritingAid vs Capacities
| Feature | Gemini CLI | ProWritingAid | Capacities |
|---|---|---|---|
| Description | Google's open-source AI agent that brings Gemini into your terminal. Built for: Makers who want a free-tier AI agent in the terminal. Format: CLI. License: Apache-2.0. Open source on GitHub (107,286 stars as of 2026-10-11). Privacy note: Usage statistics are sent to Google by default; you can opt out in settings. | 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 and open source; self-hosting, model or API costs may apply | 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 | Coding | Writing | Research and notes |
| Website | Visit Gemini CLI | Visit ProWritingAid | Visit Capacities |
| Info last checked | October 12, 2026 | October 14, 2026 | October 13, 2026 |
Loading selector…