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.

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.

MarkLayer

stagewise vs MarkLayer

By Vadym Rusin · Last updated: March 2026

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.

Bottom line

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.

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.
Vadym Rusin, MarkLayer developer

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

Free stagewise alternatives MarkLayer vs Markup.io MarkLayer vs Pastel MarkLayer vs BugHerd MarkLayer vs AnnotateWeb MarkLayer vs Jam.dev MarkLayer vs Marker.io MarkLayer vs Userback MarkLayer vs Ruttl MarkLayer vs Loom MarkLayer vs Hypothesis MarkLayer vs Usersnap MarkLayer vs Volley MarkLayer vs Superflow MarkLayer vs Feedbucket MarkLayer vs Figma

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

Or add the free Chrome extension for sites the web app cannot embed, such as pages behind a login.