Resend vs Customer.io — why Resend wins
We recommend Resend over Customer.io for most people, based on real user reviews. Here's the honest breakdown.
| Customer.io | Resend | |
|---|---|---|
| Our pick | Good, but short on reliability | Recommended |
| Rating | ★★★☆☆ 2.9 | ★★★★★ 4.6 |
| Best for | Apps sending multi-channel notifications (email, SMS, push) from one API | Developers sending password resets, receipts, and notifications reliably |
| Pricing | Trial credits / Per notification | 100/day-3K/mo / ~$15-30/mo (50K) |
Where Customer.io falls short
- Clunky, dated interface
- Disappointing in practice
- Expensive for what you get
- Frustrating user experience
Why Resend wins
- REST API + SMTP relay, both
- Deliverability and inbox placement focus
- Webhooks for opens, clicks, bounces
Try Resend
Rated 4.6 by real users across Trustpilot, G2 and Capterra.