Comparison
| Tool | Price from | Free plan | Category |
|---|---|---|---|
 Opera AI | not listed | yes | Browser extensions |
 Sider | not listed | yes | Browser extensions |
 Gemini in Chrome | 97,99 PLN/mo | ? | Browser extensions |
 MaxAI | 12 USD/mo | yes | Browser extensions |
 HARPA AI | 55.4 PLN/mo | ? | Browser extensions |
 QuillBot | not listed | ? | Writing & editing |
 Gist AI | not listed | yes | Browser extensions |
 Kagi | 5 USD/mo | trial | AI search engines |
 Microsoft Edge Copilot Mode | 9.99 USD/mo | yes | AI search engines |
Each alternative in short
1. Sider
AI sidebar and browser agent that chats with multiple AI models, summarizes web pages, and automates browser tasks.
Yes, there is a free plan. The pricing page lists a free tier for translation (basic model) and the Chrome extension itself; the exact free credit allowance is not stated in the text.
2. Gemini in Chrome
AI browsing assistant built into Google Chrome that answers questions about open tabs, summarizes pages and videos, and can act on web tasks.
The vendor does not state this clearly on the homepage or pricing page.
3. MaxAI
Browser extension that gives an AI assistant sidebar for reading, writing, summarizing and translating content on any webpage.
Yes, there is a free plan. Unlimited Free chat with the fast free AI model, 3 Pro chats per day, limited file uploads, basic browser features.
4. HARPA AI
Chrome extension giving access to many AI models on any web page, for summarizing, writing, research and web automation.
The vendor does not state this clearly on the homepage or pricing page.
5. QuillBot
AI writing suite for paraphrasing, grammar checking, AI detection, and content creation, aimed at writers, students, and professionals.
The vendor does not state this clearly on the homepage or pricing page.
6. Gist AI
Free Chrome extension that summarizes websites, YouTube videos and PDFs using ChatGPT, for students, researchers and busy professionals.
Yes, there is a free plan. Completely free extension; summarizes any website, YouTube video, online PDF and local PDF, with no length restriction according to the site.
7. Kagi
Ad-free, privacy-focused search engine and AI assistant, funded by user subscriptions, for people who want search results without tracking or ads.
There is a free trial. Trial plan with 100 searches and 100 Kagi Assistant interactions; free use of 150 searches, Orion Browser, Kagi Translate and the Small Web.
8. Microsoft Edge Copilot Mode
AI assistant built into the Edge browser that works across your open tabs to compare options, summarize pages and finish tasks.
Yes, there is a free plan. Copilot in Edge is available without payment; higher usage limits and premium AI experiences are included with Microsoft 365 subscriptions.
FAQ
What is the best alternative to Opera AI?
The most popular option in the same category is Sider. See the comparison table above.