Cobalt Capture

By PerfSpot LLC

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Open in Claude

Overview

Cobalt Capture turns product feedback into something an AI agent can act on: annotated screenshots and notes in a review anyone can open by link. Connect with your Cobalt account and Claude can: Read. Give Claude any Cobalt review link and get_review returns the reviewer's notes as text plus each annotated screenshot as an image, so it sees exactly what was marked and what to change. Write. Turn a QA pass, a browser test, or a product study into one review saved to your account: create_review to start, add_screenshot and add_note as it goes, replace_screenshot to retake a capture, and update_review to put the verdict at the top. No browser needed for public pages: add_screenshot can render any public URL at desktop or mobile size. Find. list_my_reviews finds your reviews by name, and search and fetch look up the product teardowns Cobalt has published. Built-in study playbooks (pricing teardowns, positioning, comparisons, usability and flow passes) give Claude a written method you can pick as a prompt, and the full text of each is published at cobaltcapture.com/developers#playbooks. Each one states its plan first, and the ones that use a product wait for your go. Temporary test inboxes let Claude test the signup flow of a product you own or are authorised to test: each lasts 24 hours, only receives mail, and up to 20 can be created per hour. For product managers, designers, founders and developers who want feedback and QA runs captured as reviews a person or an AI can read.

Tools

add_note

ChatGPT

Append a free-standing text note (not tied to a screenshot) to a review created by create_review. Use for context, steps taken, or a summary of findings between screenshots.

add_screenshot

ChatGPT

Append one screenshot, with an optional title and note, to the end of a review. The image is stored in Cobalt and shown in the review. Three ways to supply it: page_url, a public page that Cobalt renders in a headless browser (viewport 'desktop' at 1280px or 'mobile' at 390px, full_page for the whole scroll, hide_selectors for elements to hide; common cookie banners are hidden automatically), which also returns the rendered image; image_url, an image already uploaded to https://cobaltcapture.com/api/upload; or image, a small base64 image. This tool only appends; it never changes an existing item (replace_screenshot does that).

check_inbox

ChatGPT

Read mail delivered to an inbox from create_inbox, newest first, for example a verification code or confirmation link from a signup email. Returns immediately; mail usually arrives within seconds, so an empty result can be checked again shortly. format="html" returns each message's HTML for reviewing the email's design.

create_inbox

ChatGPT

Create a temporary email inbox for signing up to a product under test. Returns an address to enter in the signup form and an inbox_token for reading it with check_inbox. Inboxes expire after a day.

create_review

ChatGPT

Start a new Cobalt Capture review in the signed-in account and get a handle for filling it in. Use this to compile the findings of any site study (a usability pass, a pricing teardown, a positioning audit, a QA run) into one shareable, durable report with real screenshots. Works from any client, chat assistants included: with no browser, add_screenshot(page_url=...) renders the pages for you. Returns a review slug to pass to add_screenshot / add_note / update_review, and a review_url to share. The review is saved to the account straight away; no token or save step is needed.

email_review

ChatGPT

Email a link to a review to the person who ran the study. Sends only to an address that belongs to a verified Cobalt account (other addresses are refused). The email contains only the review link, never text supplied in the call.

fetch

ChatGPT

Fetch the full text of a Cobalt study by the id search returned, or of any Cobalt review by its URL (/r/<slug>) or slug. Returns text: findings, prices, the comparison matrix, and the underlying review's notes with links to its screenshots. Use get_review instead when you need to see the screenshots as images.

get_playbook

ChatGPT

Return the full text of a Cobalt study playbook: a step-by-step method for a kind of product review that ends in a shareable Cobalt review. Available: 'pricing_teardown' (can a buyer tell what they would pay and which tier fits; public pages only); 'website_teardown' (what each key page leads with and says, judged as a first-time visitor; public pages only; 'positioning_pass' is its old name); 'comparison_study' (two or three products compared for one buying decision, with a sourced matrix; public pages plus web search); 'usability_pass' (a first-time-user audit that signs up and uses the product; needs a browser); 'flow_pass' (one named flow such as signup or checkout, including its emails; needs a browser); 'investigation_pass' (a product investigation of an app the user owns, run in its own environment; needs a browser and usually the code). The public-page studies work without a browser because add_screenshot(page_url) renders pages server-side.

get_review

ChatGPT

Fetch a Cobalt Capture review by its share link or slug. Returns the reviewer's notes as text AND each annotated screenshot as an image, so you can see exactly what was marked and what to change.

list_my_reviews

ChatGPT

List the reviews in the signed-in Cobalt account, newest first: title, review URL, when it was made, how many items it has, and whether it is still editable. Use it to find a review the person refers to by name, then pass its URL to get_review, or to add_screenshot / add_note / update_review to keep working on it.

replace_screenshot

ChatGPT

Overwrite one existing screenshot in a review with a new capture, in the same position. Destructive: the old image and any pins or annotations on it are removed and cannot be recovered; the title and comment change only if new ones are passed. Works on screenshots only, not notes. Takes the same capture arguments as add_screenshot, plus item, the 1-based number of the screenshot to replace.

search

ChatGPT

Search the studies Cobalt Capture has published on well-known products: pricing teardowns, positioning audits, and head-to-head comparisons (for example Canva pricing, Spotify vs Apple Music). Returns matching studies as {id, title, url}; pass an id to fetch for the full text. It does NOT search private reviews, which are reachable only by their link (use get_review, or fetch with the review URL).

update_review

ChatGPT

Set or replace a review's summary and/or title. The summary is shown at the top of the review, above every screenshot and note. Replaces any existing summary or title.