There's a free route. Clone the GitHub repo and build the extension yourself. If you'd rather not build it, the Chrome Web Store version costs $1 as a one-time purchase.

Which browsers support AgentEcho?

Chrome, through the Manifest V3 extension system. There's no Firefox or Safari version, so it's a Chrome-only tool for now.

Does it work with AI coding assistants like Cursor or Claude?

Yes, that's the main point. The exported Markdown is built as AI coding assistant feedback, so an agent can read the element context and act on your notes without you explaining where each item lives.

Do I need to be a developer to use it?

Not strictly, but it helps. The tool is built around CSS selectors and component names, so the output makes the most sense to someone doing front-end work.

Can I use AgentEcho on any website?

Yes. It works on any page you open in Chrome, and the Shadow DOM isolation keeps the annotation layer from clashing with the site's own styles.

Does AgentEcho have an API?

No. No. It's a browser extension with a copy-to-clipboard export, not a service with an API you can call from code. If you need automation, you'll have to script around the Markdown yourself. If you keep losing time translating "that thing near the top" into something a developer or an AI assistant can act on, AgentEcho is worth the dollar. It's small, it's cheap, and it fixes a real annoyance. Install it, annotate one page you're reviewing this week, and see whether the Markdown report saves you a round of clarifying messages.

AgentEcho

Areshkew · Coding

AgentEcho is a visual feedback annotation Chrome extension that lets you drop numbered markers on any webpage element and turn them into a clean Markdown report. Instead of writing "the button near the top right," you click the actual button, type your note, and AgentEcho captures the element's selector, classes, text, and framework component name for you. It's built for developers who need to send precise UI feedback to teammates or AI coding assistants.

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About AgentEcho

What Is AgentEcho

AgentEcho is a browser extension that adds an annotation layer on top of any website. You activate it, hover over elements until the blue highlight lands on the right one, and click to place a marker. Each marker holds your note plus the technical details of that element, so the person or AI reading your feedback knows exactly what you meant.

The problem it solves is a familiar one. Pasting a screenshot into a bug tracker loses the CSS selector. Text descriptions like "the small link under the header" get misread. Sound familiar? AgentEcho closes that gap. It pairs your words with machine-readable element context that a coding agent can act on directly.

The biggest limitation comes from its scope. AgentEcho runs on Chrome only and works through the Manifest V3 extension platform, so Firefox and Safari users are out of luck. It also has no cloud sync. Feedback stays tied to the browser profile where you created it, and there's no built-in way to share reports beyond copy-pasting the Markdown.

Getting Started

Install AgentEcho from the Chrome Web Store, or clone the GitHub repo and load the dist/ folder as an unpacked extension.
Pin the extension icon to your toolbar and open a page you want to review.
Click the icon, then hit Activate to turn on annotation for that tab.
Hover to highlight an element, click it, and type your feedback in the modal that pops up.
Repeat across the page, then click Copy to send the formatted Markdown wherever you need it.

Product Information

A quick look at AgentEcho's pricing, supported platforms, and performance.

Free PlanYes

Paid Plans$1 one-time

PlatformChrome (Manifest V3 extension)

DeveloperAreshkew

CategoryCoding

Release DateJan 2026

Latest UpdatedJan 2026

Website Visits649.3M

Website Global Rank50

API AvailabilityNo

Best for

The users, tasks, and scenarios where this tool fits best.

Users

Front-end developers
QA testers
Solo builders using AI coding assistants

Tasks

Writing precise bug reports
Directing AI coding assistants
Code review follow-ups

Scenarios

Reviewing a staging build before release
Reporting layout bugs on mobile-width pages
Giving feedback on a design a teammate shared

Key features

Click-to-Mark Annotation

You place a numbered marker on any element with a single click. A blue highlight shows exactly what you're targeting before you commit. Markers stay visible and positioned on the page, so you can build up a full list of notes in one pass rather than fixing things one at a time. Why bother? Because a single combined report beats ten scattered messages.

Framework Component Detection

AgentEcho identifies React and Angular components on the page and records the component name with each piece of feedback. That means your note arrives attached to SubmitButton rather than just a raw DOM node, which cuts down on back-and-forth when someone else has to find the code.

Automatic Element Analysis

Every marker captures a stable CSS selector, the element's classes, IDs, and data attributes, plus its visible text and on-page position. That CSS selector annotation is what makes a report usable. A manual screenshot or written description can't reproduce it.

AI-Ready Markdown Export

One click copies everything to your clipboard as a structured Markdown report, with a header for the URL, capture time, and item count. The layout is tuned for AI coding agents, so you can paste it into a chat with an assistant and get edits that match the elements you flagged.

Shadow DOM Isolation

The annotation UI runs inside a Shadow DOM, which keeps it from picking up or leaking page styles. In practice, this means the toolbar and markers look consistent and don't break the site you're reviewing, even on pages with aggressive CSS.

Keyboard Shortcuts

A small set of shortcuts speeds up repeat work. Press C to copy all feedback. Press H to hide markers. Delete clears them, and Escape leaves annotation mode without touching the toolbar. Handy once you've placed a dozen notes.

Pros and cons

Pros

Sends element context that plain screenshots can't, including selectors and framework component names.
The Markdown output is structured for AI assistants, so it drops into an agent chat without reformatting.
Runs on any website and stays out of the page's styling thanks to Shadow DOM isolation.
Costs a dollar on the Chrome Web Store, and you can build it free from source if you prefer.

Cons

Chrome only, so anyone on Firefox or Safari can't use it at all.
No cloud sync or team sharing, which means reports live in the browser profile that made them until you copy them out.
Vue and Svelte detection are still listed as planned, so non-React/Angular projects get less framework context.

Frequently asked questions

It's a visual feedback annotation tool that runs as a Chrome extension. You click page elements to place numbered markers, add a note to each, and export everything as a Markdown report that carries the element's selector and component details. Think of it as a bug reporting tool that keeps the technical context attached to your note.

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