Plannotator
Plannotator is a local browser review surface that lets you mark up agent plans, documents, and code diffs and send feedback back to the agent for people who review AI coding work.
What it is good for
- Reviewing an AI agent's plan before it starts coding
- Commenting on code changes made by an AI coding agent
- Sending written feedback back to an AI agent with one click
- Annotating markdown documents and HTML files from an agent
At a glance
- Who it is for
- Setup
- Guided command-line setup
Level 4 of 5. You copy and paste commands into a terminal by following the instructions. Comfortable territory for vibe coders.
- Cost
- Free and open source
- Type
- Agent app
- Tasks
- Works with
- Claude Code, Codex, OpenCode, Pi, GitHub, GitLab
Momentum
- Rank this week
- Not ranked yet
- Best rank
- None yet
- GitHub stars
- 9,817
GitHub numbers as of Nov 2, 2026. Updated weekly.
Official links
Setup steps are on the official pages. We do not repeat them here, since they change.
Questions
- Is Plannotator free?
- Yes. It is free and open source (Apache-2.0 license).
- Do I need to know how to code to use Plannotator?
- You do not need to write code, but setup means copying and pasting commands into a terminal by following its instructions.
- What does Plannotator work with?
- According to its own documentation, it works with Claude Code, Codex, OpenCode, Pi, GitHub, and GitLab.
- What is Plannotator good for?
- Reviewing an AI agent's plan before it starts coding, commenting on code changes made by an AI coding agent, sending written feedback back to an AI agent with one click, and annotating markdown documents and HTML files from an agent.
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