We’re longtime users of Action Mailer and wanted something similar for our TypeScript/React apps. We didn’t find anything, so we decided to build Mailing.
We added some features that we would’ve liked in Action Mailer, like a mobile toggle (with hotkeys), and the ability to send a test email from the browser while developing. We went all in on MJML so that we (almost) never have to think about email clients or nested tables :)
Plays well with the popular JS web frameworks, too. Demo video here.