Klaviyo vs ActiveCampaign: Which Should You Use in 2026?

Klaviyo vs ActiveCampaign — the honest comparison.

The short version

Klaviyo is ecommerce-first with deep store data; ActiveCampaign is broader B2B/B2C automation.

What both share

On shared IP pools your reputation depends partly on other senders. A dedicated, isolated IP with managed deliverability avoids that entirely.

How Rainmail helps

Rainmail sends from your own domain on a dedicated, isolated IP with SPF, DKIM, DMARC, reverse-DNS and managed warm-up handled for you, plus a REST API and an AI watching deliverability — and it welcomes senders SES, SendGrid and Mailchimp reject, from $8. Run the free checker or see plans.