stagewise vs MarkLayer: a free stagewise alternative
MarkLayer and stagewise close the same gap: an AI coding agent cannot see the pixel you mean. stagewise is a developer toolbar embedded in your local dev app; you click an element and the context lands in your coding agent. MarkLayer is a browser-based app plus share link that works on any page — paste a staging or production URL with nothing to install, or use the optional Chrome extension for localhost — and adds threaded comments, real-time multiplayer, and an MCP server the agent talks back through.
Choose MarkLayer when feedback comes from more people than just you: teammates, clients, or an agent that should report status back into a shared room. Choose stagewise if you are a solo developer iterating in your local dev server and want element context piped straight into your editor agent.
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At a glance
| Feature | MarkLayer | stagewise |
|---|---|---|
| Price | Free, no tiers | Free open-source toolbar; paid cloud plans |
| Where it works | Any URL: localhost, staging, production | Your local dev app |
| Who can annotate | Anyone with the link; viewers need no install | The developer running it |
| Sign-up required | No | No for the toolbar; account for cloud features |
| Real-time multiplayer | Yes. Live cursors, comments, voice | No |
| AI agent integration | MCP server: watch, acknowledge, resolve, reply | Yes. Sends element context to coding agents |
| Threaded comments and statuses | Yes. Open, in progress, resolved, dismissed | Prompt-style handoff, not a review thread |
| Open source | Yes (Apache-2.0) | Yes (AGPLv3) |
| Best for | Team and client review with agents in the loop | Solo frontend iteration with an agent |
About stagewise
stagewise is an open-source browser toolbar that lets developers point at UI elements in their local dev app and hand the context to AI coding agents.
About MarkLayer
MarkLayer is a free, open-source web app for annotating any live webpage. Paste a URL atmarklayer.app and draw, comment, arrow, or highlight directly on the page in your browser — no install, no account, no sign-up. Share a single link and anyone can open the annotations in any browser. A free Chrome extension is available for the sites the web app cannot embed, such as pages behind a login, but it is optional and never required to view a share link. There is no paywall and no trial period.
stagewise proved developers want to point at a UI element instead of describing it to an agent. MarkLayer takes the same idea out of localhost: any URL, a share link a client can open, and an MCP loop where the agent reports back into the room.
When to choose MarkLayer
- Feedback comes from designers, PMs, or clients, not only from you.
- You need annotations on staging or production URLs, not just your local dev server.
- You want the agent to report progress back where everyone can see it.
- You want comments to persist as threads with statuses, not vanish after one prompt.
When to choose stagewise
- You are a solo developer working against your own local dev server.
- You want element context injected directly into your code editor agent with no room or link step.
- Your workflow is prompt-iterate-prompt, not review-and-resolve.
Frequently asked questions
- Are MarkLayer and stagewise solving the same problem?
- Partly. Both let a human point at a UI element so an AI coding agent gets exact context (selector, styles, position) instead of a vague description. stagewise scopes this to a developer working in a local dev app. MarkLayer scopes it to a shared room on any URL, where non-developers can leave the annotations and the agent works through them.
- Does MarkLayer work on localhost like stagewise?
- Yes. Public URLs need no install at all — paste them at marklayer.app. Localhost is the case for the optional Chrome extension, which annotates any page your browser can open, including a dev server on any port. Share links open in any browser either way.
- Can an AI agent resolve MarkLayer annotations?
- Yes. The marklayer-mcp server exposes tools to watch a room for new annotations, mark one in progress, resolve it with a summary reply, dismiss it with a reason, or reply without changing status. Humans in the room see each change live.
- Is stagewise free?
- The toolbar is open source under AGPLv3, and paid cloud plans exist (August 2026). MarkLayer is fully free with no tiers, licensed Apache-2.0.
Related comparisons
Try MarkLayer
Paste any URL at marklayer.app and annotate the live page in your browser. No install, no account, no sign-up. Recipients of your share links don't need to install anything either.
Annotate a page