htmlcollabs

How it works

Four things, done properly.

Not a page builder, and not another code editor. The gap it fills is the one between writing email HTML and getting a team to agree on it.

See the whole flow at once

Every email in a sequence, live and side by side on a canvas you can pan and zoom. Spot the inconsistent button, the drifting header, the CTA that says three different things.

The code is the source of truth

HTML on the left, preview in the middle. Click an element and the editor jumps to it. Edit text, colour, spacing and links on the canvas, or type the markup yourself. Copy it out clean.

Comments land on the pixel

Pin a note to the spot you mean instead of writing "the second heading, on mobile". Reviewers never touch the code, and nothing goes missing in a thread.

Everyone's in the room

Live cursors, live edits, live comments. You can see who's looking at which email, which is usually enough to stop two people rewriting the same paragraph.

Nothing to migrate

It speaks the HTML you already have.

Table layouts, ghost tables, conditional comments and merge tags all survive the round trip, because nothing gets re-generated. Paste from your ESP, work, paste back.

welcome-1.html

<td style="padding:30px 28px">
  <h1 style="font-size:32px;color:#1A1A1A">
    Ready to test your soil?
  </h1>
  <p>Hi {{ first_name }} — your kit is
     on its way.</p>
</td>

Who it's for

Sharp about the job it does.

A good fit if you

Build email in HTML and review it with people who don't
Run flows of several emails that need to feel like one thing
Work with an agency, a client or a marketing team across time zones
Find Figma heavy for something that is, in the end, markup
Also prototype landing pages and other HTML that needs eyes on it

Probably not if you

Want a drag-and-drop builder that writes the HTML for you
Need rendering tests across dozens of email clients
Send from one platform and never leave its editor
Are looking for a full design tool rather than a review space

Your whole email flow
on one canvas.