Minutemailer is a strong tool with an emphasis on visual emails and "what you see is what you get"-based email building. They've got a strong record when it comes to their commitment to privacy and GDPR compliance.
Overall, they're not a terrible choice (especially if you're based in the EU, which is a core part of how they position themselves.) Buttondown offers three main things that Minutemailer does not:
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Scheduling | Minutemailer | Buttondown |
Web archive | Minutemailer — | Buttondown |
Send from custom domain | Minutemailer — | Buttondown |
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CSS | Minutemailer — | Buttondown |
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Tags | Minutemailer — | Buttondown |
Metadata | Minutemailer — | Buttondown |
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Minutemailer — | Buttondown | |
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Host on custom domain | Minutemailer — | Buttondown |
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Dedicated IP | Minutemailer — | Buttondown |