Code-First CMS For Newsletters

The CMS for
Newsletters

Build blocks with React Email and Tailwind CSS,
and compose newsletters in a simple admin interface.

Why we built Celaro

Build a system of blocksand let anyone send newsletters with confidence

We built Celaro because shipping newsletters meant choosing between two bad options. Developer-heavy tools created bottlenecks. Marketing-heavy tools led to broken formatting and inconsistent designs.

Typed blocks in your codebase

Code-First
For Developers

Build blocks in code right from your IDE.

Typed Blocks
Build fully typed blocks with field definitions and automatically generated TypeScript interfaces.
CLI
Sync changes instantly: every save you make is pushed to the server via our dev commands.
Generate with AI
A code-first architecture means natively better AI support for generating and iterating on blocks.

Visual editing for your team

Content-First
For Marketers

Let your team focus on content, not code.

Live Preview
Add blocks and fill in fields while seeing your changes reflected in real time.
Reusable Content
Blocks you create for one email can be reused across campaigns: no need to rebuild.
Consistent Quality
Content always renders correctly according to the design, reducing last-minute layout surprises.

Newsletters For
The Modern Web

Work with your favorite tools

The CMS forNewsletters

Build a system of blocksand let anyone send newsletters with confidence

Code-FirstFor Developers

Typed Blocks

CLI

Generate with AI

Content-FirstFor Marketers

Live Preview

Reusable Content

Consistent Quality

Newsletters ForThe Modern Web

The CMS for
Newsletters

Code-First
For Developers

Content-First
For Marketers

Newsletters For
The Modern Web