# SendGrid
Canonical: https://sendstudio.io/ja/tools/sendgrid

The high-scale email delivery platform (now part of Twilio) for transactional and marketing email at massive volume.

Rating: 4/5 (8/10)

SendGrid (now part of Twilio) is delivery infrastructure at the largest scale ,  it delivers north of 100 billion emails a month and is trusted by companies like Uber and Spotify for transactional sending. If raw deliverability and volume are the requirement, it's a proven choice.

It also offers a marketing campaigns product with segmentation, A/B testing, and automation, plus an email validation API to clean lists before sending. That said, its developer experience feels dated next to newer entrants like Resend, and it isn't an AI-generation platform.

> **Where it fits:** Pick SendGrid for high-volume delivery infrastructure. Modern dev teams optimizing for DX often prefer Resend; for AI-first content, pair delivery with a generation tool like Brew.


## Strengths
- Industry-leading deliverability at enormous scale.
- Mature, reliable transactional Email API.
- Email validation to protect sender reputation.
- Trusted by very large senders.

## Watch-outs
- Developer experience feels dated next to Resend.
- Marketing/automation depth lags dedicated platforms.
- No AI-first content generation.