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ProtoNote
ProtoNote is a web app for sharing prototypes, AI-built artifacts, and documents for browser-based review. It supports HTML, Markdown, images, and PDFs, and works as a Claude connector for creating and updating review links from chat.
What ProtoNote is
ProtoNote is a web app for sharing prototypes, AI-built artifacts, and documents so other people can review them in place. The product centers on a hosted link that turns a file or Claude-generated output into something teammates can open, inspect, and annotate directly in the browser.
The site says ProtoNote is free and private by default. It supports HTML, Markdown, images, and PDFs, and it also works as a Claude connector so you can create or update a review link without leaving chat. Notes are pinned to specific locations on specific versions, which makes it useful for iterative design, product, and content review.
Core features
Hosted sharing and Slack unfurls
Share one hosted link instead of an attachment. The page opens on any device and can show a real preview in Slack.
No-account review flow
Invite feedback without forcing sign-up. Reviewers can open the link, type their name, and leave notes immediately.
Pinned notes and version history
Notes attach to the exact spot on the exact version, and earlier comments stay with earlier versions after you ship updates.
Organization for ongoing review work
Folders help organize prototypes so they are not lost across many chats, and the Pro plan includes unlimited prototypes.
Viewer tracking and review activity
You can see who viewed a prototype, and when, and the dashboard updates as notes and replies come in.
Common use cases
Prototype and artifact review
Use ProtoNote to turn a prototype, mockup, or draft artifact into a link that teammates can open and annotate in the browser instead of handling attachments or downloads.
Versioned design feedback
When you are iterating on a page or design, collect comments on the exact area and version so feedback remains tied to the change being discussed.
Claude-based workflow
If you are working in Claude, ask it to make a ProtoNote, then share the generated link with others or pull open notes back into the chat to apply edits.
Fast stakeholder review
Share with managers, clients, or other reviewers who should not need an account. They can open the link, identify themselves, and leave notes right away.
Ongoing review organization
Keep multiple files for the same project together as pages in one project, with folders and a persistent dashboard to reduce lost context across chats.
Pros and Cons
Pros
- Reviewers can comment without creating an account.
- The product supports several common inputs, including HTML, Markdown, images, and PDFs.
- Notes are pinned to exact spots and exact versions, which helps preserve review context across revisions.
- Private-by-default sharing and link controls reduce accidental exposure.
- The Claude connector lets you generate a ProtoNote and pull notes back into Claude for follow-up work.
- Free reviewers never pay or hit an upgrade wall.
Cons
- The free plan is limited to 3 active prototypes.
- Team plans are not available yet; the site says shared folders, workspaces, and centralized billing are still future requests.
- The source pages do not spell out every supported workflow beyond file upload, hosted review links, and the Claude connector.
FAQ
How do I set up ProtoNote with Claude?
ProtoNote works as a Claude connector. The setup shown on the site takes about 30 seconds: add a custom connector in Claude, point it to ProtoNote’s MCP endpoint, and sign in when prompted.
Do people I share with need to sign up?
Reviewers do not need an account. They open the shared link in their browser, enter their name, and leave notes directly on the prototype or artifact.
What are the main free and paid limits?
The free plan allows 3 active prototypes. The Pro plan is $10 per month or $10 per month billed annually, and it includes unlimited prototypes, folders, version history, and viewer tracking.
What happens if I cancel or downgrade?
If you downgrade or cancel, nothing is deleted. Prototypes beyond the first three are archived, their links pause, and notes stay intact until you resubscribe.
Is shared work public?
ProtoNote is private by default. Only people with the link can open a prototype, and you can disable or regenerate the link at any time to cut off access.
Quick Facts
- Category
- Productivity / Developer Tool
- Platform
- Web
- Primary users
- People sharing prototypes, artifacts, and review drafts
- Supported inputs
- HTML, Markdown, images, PDFs
- Pricing
- Free for 3 active prototypes; Pro is $10 per month
- Integration
- Claude connector
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