About Cobalt Capture
A screenshot and annotation tool for the moment after the screenshot: the feedback has to reach a developer or an AI coding agent, and it has to arrive in a form they can act on.
What it is
Cobalt Capture starts where most screenshot tools stop. You capture a screen, crop to what matters, drop numbered pins and arrows, and talk through what's wrong instead of typing it. The result is a review at a shareable link: a page a stakeholder can read, and a markdown document a coding agent can read directly, screenshots included. There is no install and no password: you capture first, and we ask for an email at the end only so we can send you the link.
The other half is newer. A coding agent can drive the whole thing itself over the Cobalt MCP server: point it at a URL, and it signs up, works the real tasks a new user would, screenshots every point of friction, and files the review. Ready-made playbooks cover usability passes, positioning audits, and single-flow walkthroughs, so the person asking only needs the site's address.
Who builds it
Cobalt Capture is built and run by PerfSpot LLC, a small US software company, as part of the Middlefield General Services family of tools. It is a small team that ships small, focused products and keeps them running. The tool exists because we needed it ourselves: our own feedback loop with coding agents was a pile of screenshots in a chat window, and nothing in it survived to the next session.
It is free to try and to use. A link you share keeps working for the people you sent it to; after 7 days your own side of a free review goes read-only, and Pro keeps editing, exports and agent access open. The tour shows a real account in use. Questions and problems go to the contact page, and a real person reads every message.
Tools we also build that you might find useful
These are standalone, independent tools that happen to share builders. No shared login, no bundle, just relatives worth a look.
- AcornReply Every customer message from any product and any surface, in one inbox — AI drafts every reply for you to keep, edit or dismiss, and can answer on its own when you turn it on.
- JupiterInvoice Slick invoices and quotes in seconds — your customer can update details, sign, or pay right on the document, so you get paid faster.
- Jupiter Signup Describe your signup form and watch AI build it live — payments and all, no form builder to wrestle.
- TangoQR Dynamic QR codes: change where they point anytime, with the analytics, bulk creation, and branding to run real campaigns.
- JupiterFetch A hosted brand API: send a domain, get its logos, colors, typefaces and links back as JSON, one cent a call.
Part of a family of independent tools
Cobalt Capture is one of a set of small, independently useful tools built by the same people.