Honest, side-by-side comparisons against every major email API and platform — pricing verified against public pricing pages, concessions included. Every page says when the other tool wins.
Developer-first sending services: APIs, SMTP relays, and raw infrastructure.
Resend is a developer-focused email API best known for React Email, polished docs, and a strong presence in the JavaScript ecosystem.
SendGrid is Twilio’s email platform — one of the oldest and largest, built for high-volume senders and enterprise deliverability programs.
Mailgun is a long-running transactional email API from Sinch, with strong parsing and routing features, popular with engineering teams since 2010.
Postmark is ActiveCampaign’s transactional email service, famous for deliverability focus, message streams, and publishing its own time-to-inbox metrics.
Amazon SES is raw email-sending infrastructure from AWS — the lowest per-email price available, with everything above the SMTP/API layer left for you to build.
MailerSend is the transactional email service from the MailerLite family, known for approachable design, a drag-and-drop template editor, and email verification tools.
SMTP2GO is a reliability-focused SMTP relay and email API with a long-standing free tier, popular for getting application and device email delivered with minimal fuss.
Mailjet is a European email service from Sinch (sister to Mailgun), combining an email API with a drag-and-drop editor and team collaboration features.
ZeptoMail is Zoho’s transactional-only email service with pay-as-you-go credit pricing, popular with cost-conscious teams — especially in India.
Mandrill is Mailchimp Transactional — an add-on for sending application email, available only alongside a paid Mailchimp Standard or Premium marketing plan.
Suites where campaigns and journeys lead, with sending underneath.
Brevo is an all-in-one marketing platform (formerly Sendinblue) — email, SMS, WhatsApp, chat, and a CRM — priced by email volume with unlimited contacts on paid plans.
Loops is "email for SaaS" — marketing, product, and transactional email behind a Notion-style editor, priced by contact count with unlimited sends.
Customer.io is a behavioral messaging platform for lifecycle marketing — data-driven journeys across email, push, in-app, and SMS, priced by profile count.
Prefer the switching angle? Browse the alternative guides — why teams move, what each tool still does well, and 5-step migration plans.
All of this data is published as a machine-readable comparison dataset (JSON) under CC-BY-4.0 — free to cite with attribution. Every price carries the date it was checked.