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What is MailInApp?

MailInApp is a no-code studio for interactive emails. You design emails with blocks like carousels, polls, forms, countdowns, spin-to-win wheels and charts — and recipients interact with them directly inside their inbox, without installing anything or leaving the email.

Under the hood, every interactive block is built with pure HTML and CSS (a technique often called kinetic email). Email clients strip JavaScript from every message, so MailInApp never relies on it.

Why interactivity in email is hard

Email clients disagree about almost everything. Some render modern CSS, some strip <style> tags entirely, and classic Outlook still renders emails with Microsoft Word's engine. An interactive email that isn't engineered carefully looks broken for a large share of your audience — which is why most senders never try.

MailInApp exists to remove that risk. Its core is the fallback engine: every block you add is compiled into three output tiers, and each recipient automatically gets the richest tier their client can render:

  1. Kinetic — full CSS interactivity (carousels that slide, accordions that expand, polls answered in place).
  2. Static — a clean, stacked version with a call-to-action link, for clients that strip styles.
  3. Outlook — dedicated table-based markup for classic Outlook, generated through conditional comments.

On top of that, every email gets a hosted live view: a fully interactive web version behind a signed link, so no recipient is ever locked out of the experience.

Read more in How fallbacks work.

What MailInApp is not

  • Not AMP for Email. AMP renders in very few clients, requires registering each sender with Google, and needs an ESP capable of sending a separate MIME part. MailInApp's kinetic approach reaches far more inboxes with none of that setup.
  • Not just a template gallery. Built-in starter templates and a community gallery of user-submitted ones help you start faster, but picking one only seeds a project — the studio underneath is a real visual builder: layout blocks, interactive blocks, merge tags, live data preview and autosave, not a fixed layout you're stuck with.

A complete platform, however you send

MailInApp is a full send platform, not just a builder that hands off to one. Verify your own domain and send natively — no external ESP or SMTP credentials needed — or send from the dashboard through your own SMTP relay. Already run an ESP with automations and reputation you want to keep? Export the compiled HTML and paste it into a custom-HTML campaign there instead. Either way, MailInApp hosts the interaction endpoints and analytics. A verified domain can also receive email — named addresses like support@, read and replied to from the same dashboard.

How a campaign flows

  1. Design your email in the studio using layout and interactive blocks.
  2. Personalize it with merge tags backed by a hosted table or your own API.
  3. Send it — natively from your own verified domain or SMTP relay, or export the HTML into the ESP you already use.
  4. Measure poll votes, form submissions and ratings as they stream into analytics.

Ready to try it? Start with the Quickstart.