Best Alternatives to Monica AI
All-in-one AI assistant with GPT-5.2, Claude, and Gemini — browser extension, desktop, and mobile app. Our comprehensive comparison helps you find the perfect AI Assistant alternative based on pricing, features, privacy, and workflow requirements. We've hand-picked the top-rated tools with strong free tiers and proven user satisfaction.
Quick Comparison
| Tool | Pricing | Best For |
|---|---|---|
| Sider | free | Chrome extension sidebar AI - free access to GPT-4o/Claude 3... |
| Merlin | free | Merlin brings ChatGPT, GPT-4, Claude, Llama to websites for ... |
| Ninja AI | freemium | Ninja AI provides access to 20+ AI models including GPT-5.2,... |
| Poppy AI | paid | Poppy AI is a multiplayer AI whiteboard for creating viral c... |
| Claude in Chrome | paid | Anthropic's browser extension: reads the page you are on, th... |
Sider
Chrome extension sidebar AI - free access to GPT-4o/Claude 3.5/Gemini on any webpage. Summarize/translate/write without tab switching. 2M+ Chrome Web Store users.
Merlin
Merlin brings ChatGPT, GPT-4, Claude, Llama to websites for email writing, summarization, coding.
Ninja AI
Ninja AI provides access to 20+ AI models including GPT-5.2, Claude, and Gemini alongside autonomous agent automation for research, coding, and content tasks.
Poppy AI
Poppy AI is a multiplayer AI whiteboard for creating viral content, writing scripts, and researching — using ChatGPT and Claude together on a visual canvas.
Claude in Chrome
Anthropic's browser extension: reads the page you are on, then clicks, types and fills forms. Requires a paid Claude plan.
LanguageTool
Multilingual AI writing assistant correcting grammar, spelling, style across 30+ languages with browser extensions and desktop apps.