Sidekick

Tracking since May 9, 2026.

Changelog

• May 26, 2026
  description

  Chat with AI about any webpage. Grabs page content or YouTube transcripts as context.
  
  ## Detailed description
  
  Chat with AI about any webpage you're viewing. Sidekick adds a floating chat window that automatically reads the page content and sends it as context — so you can ask questions, get summaries, and analyze what you're reading without copying and pasting anything.
  
  On YouTube, Sidekick grabs the full video transcript with timestamps instead of the page text, so you can ask about specific parts of the video.
  
  HOW IT WORKS
  
  Click the Sidekick icon on any page. A chat window opens in the bottom-right corner with the page content already loaded. Start typing — the AI knows what's on the page.
  
  BUILT-IN COMMANDS
  
  Type /tldr to get a summary, /explain for a simple breakdown, /key for key takeaways, or /translate to translate the content. Commands also appear as clickable buttons when you first open the chat. You can edit the built-in commands or create your own in Settings.
  
  SCREENSHOT CAPTURE
  
  Click the camera button to screenshot the visible page and ask about what you see. Useful for asking about charts, layouts, diagrams, or anything visual.
  
  TEXT-TO-SPEECH
  
  Listen to any response read aloud. Choose between free browser voices or premium ElevenLabs voices. Play, pause, and resume controls on each message.
  
  MORE FEATURES
  
  - Drag and drop images into the chat to ask about them
  - Real-time streaming responses
  - Markdown rendering (bold, code blocks, headers, lists, links)
  - Conversations auto-save as markdown files when you close a tab
  - Choose from multiple Claude models (Opus 4, Sonnet 4, Haiku 4.5, Haiku 3.5)
  - Custom system prompt (e.g. "always respond in Spanish")
  - Dark mode (auto, light, or dark)
  - Resizable chat window — opens at full height by default
  - Font selection (5 options)
  - Export and import your settings
  - Each tab has its own independent conversation
  
  PRIVACY
  
  Sidekick is designed to keep your data local. There is no server, no account, no analytics, and no tracking.
  
  - Your API keys are stored locally and never sent anywhere except their respective APIs
  - API calls go directly from your browser to Anthropic — no intermediary
  - No data is sent to any server operated by the developer
  - No browsing history or personal information is collected
  - Settings exports exclude API keys
  
  Full privacy policy: https://madebysan.github.io/sidekick/privacy.html
  
  REQUIREMENTS
  
  - An Anthropic API key (get one at console.anthropic.com)
  - Optional: An ElevenLabs API key for premium text-to-speech
  
  Sidekick uses your own API key. You pay Anthropic directly for usage — there is no subscription, no markup, and no middleman.

  Chat with AI about any webpage you're viewing. Sidekick adds a floating chat window that automatically reads the page content and sends it as context, so you can ask questions, get summaries, and analyze what you're reading without copying and pasting anything.
  
  On YouTube, Sidekick grabs the full video transcript with timestamps instead of the page text, so you can ask about specific parts of the video.
  
  CHOOSE YOUR AI
  
  Pick your provider in Settings and bring your own key. Use Claude (Anthropic) for the smartest answers and image understanding, or DeepSeek V4 for fast, low-cost summaries. Image and screenshot features require a Claude model.
  
  HOW IT WORKS
  
  Click the Sidekick icon on any page. A chat window opens in the bottom-right corner with the page content already loaded. Start typing. The AI already knows what's on the page.
  
  BUILT-IN COMMANDS
  
  Type /tldr to get a summary, /explain for a simple breakdown, /key for key takeaways, or /translate to translate the content. Commands also appear as clickable buttons when you first open the chat. You can edit the built-in commands or create your own in Settings.
  
  SCREENSHOT CAPTURE
  
  Click the camera button to screenshot the visible page and ask about what you see. Useful for asking about charts, layouts, diagrams, or anything visual. Requires a Claude model.
  
  TEXT-TO-SPEECH
  
  Listen to any response read aloud. Choose between free browser voices or premium ElevenLabs voices. Play, pause, and resume controls on each message.
  
  MORE FEATURES
  
  - Drag and drop images into the chat to ask about them (Claude models)
  - Real-time streaming responses
  - Markdown rendering (bold, code blocks, headers, lists, links)
  - Conversations auto-save as markdown files when you close a tab
  - Choose your AI provider and model: Claude (Opus 4, Sonnet 4, Haiku 4.5, Haiku 3.5) or DeepSeek V4 (Pro, Flash)
  - Custom system prompt (e.g. "always respond in Spanish")
  - Dark mode (auto, light, or dark)
  - Resizable chat window, opens at full height by default
  - Font selection (5 options)
  - Export and import your settings
  - Each tab has its own independent conversation
  
  PRIVACY
  
  Sidekick is designed to keep your data local. There is no server, no account, no analytics, and no tracking.
  
  - Your API keys are stored locally and never sent anywhere except their respective APIs
  - API calls go directly from your browser to your chosen provider (Anthropic or DeepSeek), no intermediary
  - No data is sent to any server operated by the developer
  - No browsing history or personal information is collected
  - Settings exports exclude API keys
  
  Full privacy policy: https://madebysan.github.io/sidekick/privacy.html
  
  REQUIREMENTS
  
  - An Anthropic API key for Claude (get one at console.anthropic.com), or a DeepSeek API key for DeepSeek V4 (platform.deepseek.com)
  - Optional: An ElevenLabs API key for premium text-to-speech
  
  Sidekick uses your own API key. You pay your provider directly for usage, with no subscription, no markup, and no middleman.

Permissions & access

Permissions

storageactiveTabscriptingdownloads

Host access

None declared

Screenshots

Similar extensions

Alternatives to Sidekick, ranked by description similarity.

Sidekick

AI-powered webpage assistant for content understanding and interaction

12

★ 5.0

Sidekick API

AI-powered browser sidekick for web page interaction

—

Sen Chat: AI Sidebar - Chat with all AI models

AI chat, advanced web search, document interaction, and more into a convenient sidebar.

113

★ 5.0

ChatGPT Sidebar

Seamlessly access ChatGPT side-by-side in your browser sidebar.

16

AI Sider: ChatGPT + DeepSeek + Gemini

Seamlessly access ChatGPT, DeepSeek, and Gemini side-by-side in your browser sidebar.

20.0K

★ 4.9

Sidekick AI - Multi-tab Assistant

Your multi-tab AI assistant—syncing context and memory across every open page.

26

★ 5.0

AI Sidebar Pro

Multi-AI sidebar with ChatGPT, Claude, Gemini - No backend required. Your API keys, your data.

21

insidebar.ai

Multi-AI sidebar extension for quick access to ChatGPT, Claude, Gemini, and more

1.0K

★ 5.0