Working with AI agents on web changes? Stop typing long descriptions. MarkUp lets you annotate any webpage directly — draw what you want changed, label it, and send a structured visual brief to Claude, ChatGPT, or Copilot. Free. No accounts.
Hey All 👋
I'm Michael, the maker behind MarkUp.
I built this because I was spending too much time writing prompts to Claude to explain visual changes on websites.
"Make the nav button more prominent, increase the padding above the footer, increase the trust section's contrast" — by the time I'd typed it all out, I could've made the change myself.
MarkUp turns the live webpage into your prompt. Draw on it. Label it. Send it.
Try it out and let me know your feedback, feature requests, etc. I'm here to build with you.
AMA — happy to dig into how it works, what's coming in v1.1, or how I built it.
About MarkUp on Product Hunt
“Edit websites through AI with visual prompts”
MarkUp launched on Product Hunt on May 8th, 2026 and earned 64 upvotes and 4 comments, placing #45 on the daily leaderboard. Working with AI agents on web changes? Stop typing long descriptions. MarkUp lets you annotate any webpage directly — draw what you want changed, label it, and send a structured visual brief to Claude, ChatGPT, or Copilot. Free. No accounts.
On the analytics side, MarkUp competes within Chrome Extensions, Design Tools, Productivity and Developer Tools — topics that collectively have 1.5M followers on Product Hunt. The dashboard above tracks how MarkUp performed against the three products that launched closest to it on the same day.
Who hunted MarkUp?
MarkUp was hunted by Michael Castelo. A “hunter” on Product Hunt is the community member who submits a product to the platform — uploading the images, the link, and tagging the makers behind it. Hunters typically write the first comment explaining why a product is worth attention, and their followers are notified the moment they post. Around 79% of featured launches on Product Hunt are self-hunted by their makers, but a well-known hunter still acts as a signal of quality to the rest of the community. See the full all-time top hunters leaderboard to discover who is shaping the Product Hunt ecosystem.
For a complete overview of MarkUp including community comment highlights and product details, visit the product overview.
Michael Castelo