Resend
Developer-first email API with React Email templates
How it connects to Webstudio
REST API or SMTP: Webstudio Form action POST to https://api.resend.com/emails with Bearer key (server-side Resource); n8n HTTP Request node; SMTP relay for Listmonk or Coolify notifications. Marketing 'Broadcasts' with audiences for simple newsletters.
Resend research summary: the developer's email API
Research summary · Use case: Transactional email from code or automations, simple broadcasts
Verdict: Resend is the most pleasant email API to work with and its free tier covers most small Webstudio sites' form notifications. Its deliverability record is shorter than Postmark's, and its newsletter features are not yet a replacement for Listmonk. A strong default for developers; non-developers may prefer Brevo.
Pros
Best developer experience; generous free tier; React Email templates; SMTP and REST; webhooks; works as Listmonk SMTP backend.
Cons
Younger company with less proven deliverability; proprietary; marketing/broadcast features basic; 100/day cap on free tier.
Best for: Developers sending transactional email from apps, n8n or Webstudio forms
Sources used for this review
- https://resend.com/pricing - https://automationatlas.io/answers/resend-review-2026/ - https://aisotools.com/blog/resend-review-2026 - https://mailflowauthority.com/esp-reviews/resend-review - https://github.com/resend/react-email
How it connects
All stacks →Email action without automation: POST Resource to https://api.resend.com/emails with Authorization: Bearer <key>, body {from, to, subject, html} with formData bound in. Webstudio Cloud also has built-in Email to owner/visitor actions, so Resend is mainly for self-hosted exports or custom domains/templates.