Your tests check what a page does. deploydiff checks what it looks like.

A dependency bump, a CSS refactor, a content edit, a third-party script that changed overnight: the build is green, every test passes, and the pricing page has lost its button on mobile. These regressions are usually found by a customer.

Agentic coding makes this truer every month. Changes land faster and in larger batches, written by agents that read the code but never see the page. More of what ships has not been looked at by anyone.

Looking at every page, in every environment, again and again does not scale for a person. deploydiff does the looking: it captures your pages where they run, on a schedule or on demand, compares them across environments or over time, and tells you what changed — with a verdict, not a pile of screenshots.

And when something changes, the right people hear about it. A batch that fails or warns opens a notification for the team, and each person chooses, project by project and environment by environment, to hear about failures only, everything, or nothing. Someone takes it in hand so no one duplicates the work, an escalation reaches everyone who follows that environment, and every notification shows how many people were emailed. Each team sets it up the way it works, and the people who need to know, know.