What is Sider?
Sider is a browser sidebar that puts frontier models — GPT, Claude, Gemini, DeepSeek and others — on top of whatever page, PDF or YouTube video you are viewing. Its newer Hand and Code agents go further, automating multi-step tasks on real websites and letting you restyle pages in plain language.
What can you do with Sider?
- Summarize and chat with webpages, PDFs and YouTube videos in the sidebar.
- Translate pages, documents and images without leaving the tab.
- Hand off browser chores like price comparison and form filling to the Hand agent.
- Restyle or extend any website and keep the changes on your next visit.
Pricing
Sider uses a freemium model: you can get started for free with a generous tier of credits or features, and paid plans unlock higher usage limits, advanced capabilities and priority processing.
Who is Sider best for?
Sider is best suited for anyone who wants a capable AI assistant for daily writing, learning and problem-solving.
Pros and cons
✓ Pros
- Entry Nano plan costs ¥70/mo; Lite (¥175/mo) adds a 24/7 dedicated cloud computer
- Every plan includes all features — you only pay for more credits and compute
- Works with many frontier models, so you are never locked into one provider
- 10M+ users and 100K+ five-star ratings, with Chrome Editors' Picks 2026
✗ Cons
- Credits reset monthly, and heavy agent use drains lower tiers fast
- Pricing is listed in yuan, which obscures the real cost for non-China buyers
- The sidebar overlay can feel intrusive on minimalist browsing setups
Verdict
Sider is the most capable AI sidebar we have tested, and the Hand agent genuinely saves browser busywork. Start on the Nano plan and only move up if the cloud computer earns its keep.
Try Sider ↗Top alternatives to Sider
- ChatGPT Freemium
The leading AI chatbot by OpenAI for conversation, writing, analysis, image generation and everyday tasks.
- Claude Freemium
Anthropic’s AI assistant known for long-context understanding, nuanced writing and safe, thoughtful answers.
- Google Gemini Free
Google’s multimodal AI assistant integrated with Gmail, Docs and YouTube, available free on web and mobile.
- DeepSeek Free
Powerful open-weight AI model offering strong reasoning and coding performance completely free.
- Microsoft Copilot Free
Free AI assistant powered by GPT and DALL·E, built into Windows, Edge and Microsoft 365.
Sider FAQ
Is Sider free?
Sider offers a free tier with limited credits or features, so you can start at no cost. Paid plans unlock higher usage limits and advanced features.
What is Sider used for?
GPT and Claude sidebar for any webpage, PDF or video with reading, writing and image tools. It is listed in our Chat & Assistants category alongside similar AI tools.
What are the best alternatives to Sider?
Popular alternatives in the Chat & Assistants category include ChatGPT, Claude, Google Gemini and DeepSeek. Compare their free tiers and features in our Chat & Assistants category — see the alternatives list on this page.
Who should use Sider?
Sider is best suited for anyone who wants a capable AI assistant for daily writing, learning and problem-solving.
Is Sider worth trying in 2026?
If chat and AI assistants is part of your workflow, Sider is worth adding to your shortlist — evaluate its free tier against the popular picks in our Chat & Assistants category.