Feedback tool for vibe coders
Visual feedback for everything you build with AI
Symu 2 is a feedback tool for vibe coding. You build a site with Claude Code, Cursor, Lovable, Bolt, v0 or Replit, paste its URL into Symu 2, and every comment, yours or your client’s, becomes a precise instruction your AI agent can act on.
14 days free, no credit card required.
The feedback loop is the slow part of vibe coding
Generating a page with an AI takes minutes. Explaining what is wrong with it, to the AI, usually takes longer than it should, because chat has no way to point at an element. Symu 2 gives you that pointer.
When you vibe code, the cycle is: prompt, look at the result, find something off, describe it in words, repeat. The description step is where context gets lost: which section, which button, which screen size. Symu 2 captures that context at the moment you click, and hands it to the agent in a form it can search the codebase with.
Workflow with Claude Code, Cursor, Lovable, Bolt, v0 or Replit
- Publish a preview. Deploy the site to any public URL: the Lovable, Bolt, v0 or Replit preview, a Vercel or Netlify preview, or your production domain.
- Add it to Symu 2. Paste the URL. Click through the site inside Symu 2 and switch between desktop, tablet and mobile.
- Pin what is wrong. Click the element and type one change in plain words: “make this button green and say Start free”. Invite your client or teammates through the share link if they have opinions too.
- Hand it to the agent. With MCP, tell Claude Code “fix the open Symu comments”. Without MCP, click “copy as AI prompt” on one comment, or export all open comments as markdown, and paste into Cursor or any other agent.
- Close the loop. The agent replies with what it changed and resolves the comment. You reload, check it at the same breakpoint and move on.
What the agent receives
This is the kind of context a single comment carries (illustrative format):
#12 [open] by Anna (client) · Website "Acme" › /pricing Comment: "Make this button green and say 'Start free'" Page: https://acme.com/pricing · desktop 1440×900 Element: <button.btn-primary#signup> "Sign up" Selector: #plans > div.card:nth-of-type(2) > button
With a selector and an HTML snippet, an agent can grep for the class or the visible text and land on the right component on the first try, instead of guessing from a description.
Why not just paste a screenshot into the chat?
Screenshot in chat
Shows the problem, but not the element, the selector, the URL or the viewport. You still have to describe where it is, and you repeat that for every issue.
Pinned comment in Symu 2
One click captures the element and page context. Many comments from many people queue up as tasks, and the agent works through them with status updates.
See also: how to write feedback an AI agent can act on.
Pricing for solo builders
One plan at $19 per month plus VAT where applicable, with a 14-day free trial and no credit card required. Unlimited projects, screens and team members, so adding a client or a collaborator never changes the price. See pricing.
Not coding with AI yet? Symu 2 is still a complete website feedback tool for clients and teams.
What is a feedback tool for vibe coding?
It is a tool that turns “this looks wrong” into instructions an AI coding agent can act on. Instead of typing a long description of which button is meant, you click the element on the live page and the tool stores its selector, HTML, page URL and screen size, which the agent can read directly.
Does Symu 2 work with sites built in Lovable, Bolt, v0 or Replit?
Yes, as long as the site has a URL that is reachable from the internet, for example the published preview or the production domain. Symu 2 loads it through its proxy, so you can comment on it like any other website. The AI agent that fixes the issue (Claude Code, Cursor, Codex, Windsurf and others) reads the comments over MCP.
Which AI coding agents can read Symu 2 feedback?
Any client that supports remote MCP servers over HTTP, including Claude Code, Claude Desktop and Cursor. You can also skip MCP: every comment can be copied as an AI prompt and the open feedback can be exported as a markdown task list.
Can I use it on a localhost site?
Not directly. Symu 2 loads your site from its servers, so the site must be reachable from the internet. For a local project, publish a preview deployment or expose it through a tunnel first.
Is there a free trial?
Yes. You get 14 days with every feature and no credit card is required. After that Symu 2 costs $19 per month.
See how Symu 2 works on your own website.
Paste a URL, invite a client and let your AI read the feedback. 14 days free, then $19/month.