Email & Notifications

Send transactional emails, newsletters, and push notifications at scale. Compare 4 tools with verified pricing.

Resend

resend.com

Modern email API built for developers — send transactional emails with React Email templates and a clean SDK.

Best for: Vibe coders using React/Next.js who want the simplest path to sending transactional emails Free tier (100 emails/day, 3,000/month); Pro $20/month
Key Features
  • React Email integration — build email templates with React components
  • Clean, modern API with excellent developer documentation
  • Built-in analytics: opens, clicks, bounces, and complaints
Limitations
  • Newer service — smaller ecosystem and fewer integrations than SendGrid
  • Free tier limit (100/day) can be restrictive during launch periods
  • No built-in marketing email features — transactional only
Pricing verified March 2026

SendGrid (Twilio)

sendgrid.com

Industry-standard email delivery platform for transactional and marketing email at scale.

Best for: Projects that need both transactional email and marketing campaigns in one platform Free tier (100 emails/day); Essentials from $19.95/month
Key Features
  • High deliverability with dedicated IP options and domain authentication
  • Both transactional (API) and marketing (campaigns, templates) email in one platform
  • Extensive integrations and mature ecosystem
Limitations
  • Interface feels dated compared to newer alternatives like Resend
  • Pricing tiers and feature segmentation can be confusing
  • Support quality varies significantly by plan tier
Pricing verified March 2026

Postmark

postmarkapp.com

Transactional email service focused exclusively on deliverability and speed — emails arrive in seconds, not minutes.

Best for: Applications where email delivery speed and inbox placement are critical (password resets, order confirmations) 10,000 emails/month from $15/month; scales by volume
Key Features
  • Industry-leading delivery speed — most emails arrive in under 10 seconds
  • Strict sending policies result in consistently high inbox placement rates
  • Message Streams separate transactional from broadcast email
Limitations
  • No free tier — costs start from the first email
  • Strict anti-spam policies mean some legitimate use cases may be rejected
  • No marketing campaign features — purely transactional
Pricing verified March 2026

Knock

knock.app

Notification infrastructure that manages email, in-app, push, SMS, and Slack notifications from a single API.

Best for: Apps that need multi-channel notifications (email + in-app + push) managed from one system Free tier (10,000 notifications/month); paid from $250/month
Key Features
  • Single API for email, in-app, push, SMS, and chat notifications
  • User preference management — let users choose how they want to be notified
  • Workflow builder for complex notification sequences (digests, delays, batching)
Limitations
  • Paid tier pricing ($250/month) is steep for early-stage projects
  • More complex than needed if you only send email — Resend or SendGrid are simpler
  • Newer product — less community content and fewer tutorials
Pricing verified March 2026

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