AI Developer Tools

Sidenote

Review your rendered markdown site like a Google Doc: select a passage, comment, and an AI agent resolves it into a clean git diff. Local-first, in-browser.

What is Sidenote?

Sidenote is an open-source review layer for markdown websites. It allows users to select text on a rendered page, leave comments, and use an AI agent (Claude or Codex) to answer questions or patch the source markdown with a git diff.

Sidenote vs Similar AI Tools

Pricing ModelFreeFreeCustom PricingFree, Paid
Free Credits
Key Features
  • Select and comment on any block of rendered page
  • Ask questions about passages, get AI answers inline
  • Resolve comments into real edits with inline git diff
  • GitHub Pages hosting
  • Jekyll integration
  • Markdown content support
  • Workload monitoring and anomaly detection
  • Slow query identification and optimization
  • Natural language querying to SQL translation
  • Scans skills and MCP servers against ATR rules before loading
  • Real-time runtime protection against prompt injection and hijacks
  • Signed audit-ready evidence for compliance (EU AI Act, NYDFS, DORA)
Pros
  • Local-first, no data leaves the browser
  • Integrates with existing markdown workflows
  • Free hosting with custom domain support
  • Easy setup via Git
  • Quick one-line installation and setup in 15 minutes
  • Self-hosted ensures data stays within your infrastructure
  • Open source with MIT license
  • Real-time detection and prevention
Cons
  • Requires Node.js 18 or newer
  • Only works with markdown sites using remark
  • Limited to static content
  • No server-side processing
  • Requires self-hosting and VPC setup
  • No free tier or trial mentioned
  • Enterprise features require paid tiers
  • Setup may require technical expertise
Best For
  • Developers writing markdown blogs
  • Teams wanting to review and edit markdown content collaboratively
  • Developers
  • Open source projects
  • Database administrators
  • Data engineers
  • Developers building and deploying AI agents
  • Enterprises needing audit-ready AI security

How to use Sidenote?

  1. 1Install packages: npm install --save-dev remark-sidenote
  2. 2Run init: npx sidenote-cli init --agent claude
  3. 3Run dev: npx sidenote-cli dev
  4. 4On your site, select a passage and comment
  5. 5Use 'Ask' to get an answer or 'Resolve' to generate a diff
  6. 6Accept or reject the diff

Sidenote Key Features

  • Select and comment on any block of rendered page
  • Ask questions about passages, get AI answers inline
  • Resolve comments into real edits with inline git diff
  • Reject or accept patches with drift guard
  • Live activity streaming during agent work

Sidenote Use Cases

  • Reviewing blog posts in local dev server
  • Collaborative editing of documentation with AI assist
  • Local-first content editing without leaving the browser

Sidenote Pricing & Free Credits

Sidenote currently operates on a Free model.

This tool is completely free to use

Open Source

Free

Sidenote is MIT-licensed open-source software

Sidenote Pros & Cons

Pros

  • Local-first, no data leaves the browser
  • Integrates with existing markdown workflows
  • Uses Claude or Codex for AI-powered edits
  • Generates clean git diffs for easy review

Cons

  • Requires Node.js 18 or newer
  • Only works with markdown sites using remark
  • AI agent must be installed separately on PATH

What is Sidenote best for?

  • Developers writing markdown blogs
  • Teams wanting to review and edit markdown content collaboratively

Sidenote FAQ

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