Comparison
| Tool | Price from | Free plan | Category |
|---|---|---|---|
 Sider | not listed | yes | Browser extensions |
 Opera AI | not listed | yes | Browser extensions |
 MaxAI | 12 USD/mo | yes | Browser extensions |
 Gemini in Chrome | 97,99 PLN/mo | ? | Browser extensions |
 HARPA AI | 55.4 PLN/mo | ? | Browser extensions |
 Grok | 30 USD/mo | yes | Chatbots & AI assistants |
 AIPRM | not listed | yes | Browser extensions |
 Genspark | not listed | ? | Productivity & notes |
 Perplexity | not listed | yes | AI search engines |
Each alternative in short
1. Opera AI
Free, accountless AI assistant built into the Opera browser that answers questions, summarizes tabs and files, and generates images.
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.
2. 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.
3. 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.
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. Grok
Frontier AI models from SpaceXAI for chat, code, voice, images and video, available via apps, X and a developer API.
Yes, there is a free plan. Free plan gives access to Grok within generous limits, including voice mode, connectors and real-time web and X search, with limited Grok Bot and Expert features.
6. AIPRM
Browser extension for ChatGPT and Claude offering a library of ready-made prompts and tools to reuse your own prompts.
Yes, there is a free plan. Free version with access to 5,400+ public prompts, usable for an unlimited time; premium plans unlock higher quotas.
7. Genspark
All-in-one AI workspace for creating slides, docs, images, video, code and design in one place.
The vendor does not state this clearly on the homepage or pricing page.
8. Perplexity
AI answer engine giving sourced, real-time answers to questions, with a Computer mode for delegating work.
Yes, there is a free plan. Meta description describes Perplexity as free; plan limits are not stated in the text.
FAQ
What is the best alternative to Sider?
The most popular option in the same category is Opera AI. See the comparison table above.