New: design and send email from the headless API.Explore the API
Brand

Define your brand once. Every generation respects it.

Set your colors, fonts, logo, voice, and reusable components once. Mailable applies them to every email, sequence, and page - and can lock rules so nothing off-brand ever ships.

Customers

Organize your contact and resource data in one place.

Total customers
+12.5%
1,234
PGVBVCGFSM
The problem

On-brand, every single time, done right

AI output drifts off-brand, and across a team everyone’s emails look a little different. Keeping a consistent brand by hand, across humans and agents, is a losing battle.

The old way
  • Every teammate’s emails look slightly different and the brand slowly erodes.
  • An LLM agent generates an email with the wrong colors and a tone that isn’t yours.
With Mailable
  • Everyone designs inside the same brand kit, so every send looks unmistakably like you.
  • The brand kit constrains the agent’s output, and locked rules block anything off-brand.
01

One source of truth

Colors, fonts, logo, voice, and components live in one place and apply everywhere.

  • Colors, type, logo, and voice
  • Reusable, branded components
  • Applied to email, sequences, and pages

Vercel

CEOGuillermo Rauch
Founded2015
Est. ARR$100-120M
LocationCalifornia, USA
Tags
SaaSB2B
Funding$250M Series E

AI Advisor

Vercel has been contacted 4 times in the past year. Suggested next contact is in 3 days.
02

Lockable guardrails

Mark rules as required so neither a teammate nor an agent can ship something off-brand.

  • Required brand rules
  • Off-brand output blocked at the source
  • Consistency by default
Magic Inbox

Centralize all customer communications in one shared inbox.

03

Voice, not just visuals

Capture tone of voice so the writing sounds like you, not like generic AI.

  • Tone and writing guidelines
  • Consistent voice across sends
  • Editable as your brand evolves
Customers

Organize your contact and resource data in one place.

Total customers
+12.5%
1,234
PGVBVCGFSM

What you can do

Multi-author teams

Keep every contributor on-brand without a manual review gate.

Agent guardrails

Constrain API and agent output to your brand automatically.

Rebrands & refreshes

Update the kit once and bring future sends in line instantly.

100%

of sends pass your brand rules

Every email looks and sounds like you - whether a human or an agent made it.

Join the waitlist

Describe it. Ship beautiful email.

Start free, or talk to us about designing email at scale through the editor and the headless API.