SendGrid
Twilio's email API for developers at scale
4.3(166 reviews)freemium
free tierapi access
SendGrid by Twilio handles both transactional and marketing email at massive scale. REST API, SMTP relay, webhook events, and dedicated IP warming. Used by Uber, Airbnb, and Spotify.
Pros
- Industry-standard email API
- High volume sending — millions per day
- 100 free emails/day forever
Cons
- Customer support can be slow
- Account suspension risk if complaint rates high
Best For
Developers building apps that send transactional and marketing email at scale via API
Pricing
Free
Free
- Core features included
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