A block editor that writes the MJML
13 block types — text, image, button, columns, loops, conditionals. Drag and drop; every template compiles to clean, responsive HTML that survives Outlook.
Email template builder
Email templates that hold up in every inbox.
Compose with blocks, keep variables and translations in one place, and catch what breaks — Outlook quirks, missing alt text, spam triggers — before you send. Mieler compiles it all to clean, responsive HTML.
Invite-only while we're in beta — we open access in batches. No card required.
What you get
Everything between the idea and the inbox.
Variables that preview like the real thing
Handlebars variables such as {{first_name}}, with preview profiles so you can read the email exactly as different subscribers will receive it.
Translations that keep up
Per-locale copies of every template. When the default locale changes, translations are flagged as behind — sync them before anyone sends an outdated one.
Checks before you send
Accessibility, spam signals, client compatibility and eco weight. Run all four in the editor and fix what they flag before the first send.
Brand kits and a media library
Set colors, fonts and defaults once and every new template starts on brand. Upload images to the media library or pull them from Unsplash.
Versions and block groups
Every save keeps a version you can restore. Save repeated sections — headers, footers, legal blocks — as block groups and reuse them across templates.
Your stack
Test with your ESP, ship from anywhere.
Mieler builds the template; your ESP sends the campaign. Connect one to send yourself real tests — or export the compiled HTML and use it in any tool that takes HTML.
- Test sends through Brevo, SendGrid, Resend, Mailchimp or SMTP
- Integration API keys encrypted at rest
- Copy or download the compiled HTML for any template
- No lock-in — your templates and their HTML stay yours
How it works
Three steps, one source of truth.
1
Compose
Start blank, from a brand kit, or from an AI draft. Reuse saved block groups so every email starts consistent.
2
Check
Preview desktop, mobile and dark mode, then run the four checks and fix what they flag.
3
Send
Send yourself a test through your own ESP, or export the HTML and ship it from anywhere.
Questions
Common questions.
How do I get access?
Mieler is invite-only while we're in beta. Request access with your email address — tell us what you send if you want — and we open accounts in batches. The day yours is open you get an email with a sign-in link.
Do I need to know MJML?
No. You compose with blocks; Mieler writes the MJML and compiles it to responsive HTML. If you do know MJML, you will recognize the output — sections, columns, bulletproof buttons.
Can I export the HTML?
Yes — copy or download the compiled HTML for any template and use it in any tool that accepts HTML. Your templates are never locked in.
Which ESPs can send test emails?
Brevo, SendGrid, Resend, Mailchimp (Mandrill) and any SMTP server. Connect one under Integrations; API keys are encrypted at rest.
What do the checks cover?
Four areas: accessibility (alt text, contrast, structure), spam signals (heuristics plus a deep SpamAssassin pass), email-client compatibility, and weight — including the 102 KB Gmail clipping limit.
How do translations work?
Each template keeps per-locale copies of its content. When the default locale changes, translations are flagged as behind so you can sync and review them before sending.
Ready to ship your next email?
Mieler is invite-only while we're in beta. Tell us what you send and we'll open your access.