Sider / sider.ai
AI assistant browser sidebar that provides access to ChatGPT, Claude, Gemini, and other AI models alongside any webpage, PDF, or YouTube video for contextual assistance.
Free plan
Yes
API access
No
Open source
No
Platforms
2
Sider is a browser extension that adds an AI assistant sidebar to any webpage, providing contextual AI assistance without switching to a separate application. It competes in the growing category of AI browser sidebars, where the primary value is reducing the friction of switching between a webpage being read and an AI assistant in another tab.
The sidebar provides access to multiple AI models including ChatGPT, Claude, Gemini, and others through a single interface, similar to Poe but as a browser sidebar rather than a standalone application. Users can switch between models for different queries based on the task.
Contextual features leverage the current webpage content. Selecting text on a webpage and clicking an AI action (explain, translate, summarise) passes the selected content to the AI without copy-pasting. For reading-heavy workflows, this reduces friction significantly.
PDF reading allows asking questions about PDF documents open in the browser, grounding AI responses in the document's content. YouTube video summarisation provides a transcript and AI-generated summary of any YouTube video without watching it fully.
At $8/month for the Plus plan, Sider is affordable for regular users who want contextual AI assistance across their browsing without paying for multiple AI subscriptions. The multi-model access can make it cost-effective compared to subscribing individually to ChatGPT Plus and Claude Pro.
Sider AI runs as llm assistant software built around text and image workflows. Users typically start with a prompt, upload, or connected data source, and the underlying model handles the heavy lifting before returning a result you can refine or export. It's available on chrome and edge.
Recent YouTube videos cached from the backend so this page stays fast and fresh.
The capabilities that matter most for teams evaluating Sider AI.
AI assistant accessible from a sidebar on any webpage, PDF, or YouTube video without switching to a separate application.
Switch between ChatGPT, Claude, Gemini, and other models within the same sidebar interface for different query types.
Select text on any webpage and apply AI actions like explain, summarise, translate without copy-pasting.
Free plan with limited AI queries and basic features. Plus $8/month. Pro $15/month. Team plans available. Annual billing available.
Model
Freemium
Starting price
$8/mo
Free trial
No
Monica AI is a direct competitor browser sidebar. Merlin is a similar browser AI extension. Direct subscriptions to ChatGPT Plus or Claude Pro provide more capability than browser extension access for heavy users.
A side-by-side look at the closest alternative in this category.
Key facts about model providers, platforms, and team support.
Model Provider
OpenAI, Anthropic, Google
Models
GPT-4o, Claude, Gemini
Platforms
Chrome, Edge
Deployment
SaaS
Integrations
Any website, PDFs, YouTube, Google Docs
Team Collaboration
No
Launch Year
2023
Compliance signals and data-handling notes as reported by the vendor.
Review Sider's data handling policy carefully. The extension reads page content and sends selected text or AI queries to third-party AI providers.
Browser extension reads page content. Review privacy policy before use with confidential web content. Queries and page selections are sent to third-party AI providers. Consider whether sensitive browsing is appropriate with extension active.
Editorial Verdict
Sider is useful for knowledge workers who frequently need AI assistance while reading web content or PDFs. Review privacy implications carefully before enabling on sensitive browsing sessions.
Last verified July 24, 2026.
Privacy considerations apply as with any browser extension that reads page content. Review the privacy policy carefully before installing.
Free plan with limited AI queries and basic features. Plus $8/month. Pro $15/month. Team plans available. Annual billing available.
Free plan with limited queries per day. Pro $8.99/month. Pro+ $16.99/month with access to GPT-4 and Claude. Annual billing available.
Review Sider's data handling policy carefully. The extension reads page content and sends selected text or AI queries to third-party AI providers.
Review Monica AI's data handling policy. The extension reads page content and sends queries to third-party AI providers.
Browser extension reads page content. Review privacy policy before use with confidential web content. Queries and page selections are sent to third-party AI providers. Consider whether sensitive browsing is appropriate with extension active.
Browser extension reads page content and browsing context. Review privacy policy. AI queries processed by third-party providers. Consider disabling on sensitive pages.
Verified reviews from signed-in users, stored in the backend and averaged into this tool's rating.
Sign in to rate Sider AI and leave a review.
No other reviews yet — be the first to share how this tool performs in practice.
