Klaviyo

Klaviyo is a solid ESP. Deliverability is consistently good, the template editor has improved a lot, and the analytics give us what we need. Only gripe is the A/B testing is limited to subject lines on lower plans.

Klaviyo is the best email platform I've used for automation. The visual flow builder is intuitive, deliverability is excellent (98%+ open rates on first send), and the segmentation is powerful.

Klaviyo makes complex email sequences feel simple. We run a 14-step onboarding sequence with conditional branches and it's easy to maintain. Support team is genuinely helpful.

Reliable and feature-rich. Klaviyo handles our transactional and marketing emails well. The API is well-documented. Pricing scales reasonably as the list grows, which I appreciate.

Switched from Mailchimp to Klaviyo two years ago and never looked back. The tagging system is far superior for behavioral segmentation. Our list engagement went up 40% in 90 days.