Summary
A 2026 comparison of developer email providers on open source, self-hosting, campaigns, and pricing.
What developers actually need
Transactional API, webhooks, SDKs, and deliverability—the baseline. The differentiators are self-hosting, campaigns, open source, and total cost at scale.
Resend
Excellent DX for hosted transactional email. Proprietary, no self-hosting, limited marketing features.
SendGrid
Mature but complex. Legacy pricing and Twilio ownership. Still widely used for high volume.
Reloop
Open source, self-hostable, campaigns + transactional + agent inbox. Hosted free tier or deploy yourself.
Ready to choose?
Reloop is open source, self-hostable, and priced for builders — compare plans and features before you commit.