Side by side
| Feature | Sider | Opera AI |
|---|---|---|
| What it does | AI sidebar and browser agent that chats with multiple AI models, summarizes web pages, and automates browser tasks. | Free, accountless AI assistant built into the Opera browser that answers questions, summarizes tabs and files, and generates images. |
| Price from | not listed | not listed |
| Free plan | yes | yes |
| Platforms | chrome, ios, android, mac, windows, web | web, windows, mac |
| API | not stated | not stated |
Sider: key features
- AI sidebar on any webpage
- Chat with GPT, Claude, Gemini, Grok and other models
- Summarize web pages and long articles
- Browser task automation and form filling
- Translate webpages, PDFs and images
- Deep research and Gmail inbox triage
Opera AI: key features
- Ask about open tabs and tab groups
- Summaries and comparisons across multiple pages with source links
- File and image analysis for PDFs, spreadsheets, and documents
- YouTube transcript search, summary, and translation
- Free AI image generation from text prompts
- Text translation into 50 languages and voice input/output
FAQ
Is Sider or Opera AI better?
It depends on the job - compare prices, free plans and features in the table above.
Are Sider and Opera AI free?
Sider: 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. Opera AI: Yes, there is a free plan. Free access to Opera AI with no log-in, including the AI image generator and access to OpenAI and Google models.