Email marketing · 2026
Customer.io·vs·Mailchimp
Two solid choices in email marketing. Here's how they stack up on pricing, fit, and trade-offs — so you can decide in a minute.
Reviewed by Switchpoint Editors ·
Take on Mailchimp
The real Mailchimp tax isn't the sticker price — it's the contact-based model. Mailchimp counts duplicate addresses across audiences as separate billable contacts, and unsubscribed contacts keep counting against your tier until you manually archive them. We've seen SMB lists where 30–40% of the bill was dead weight. Switch to a send-based model (Brevo) or a creator-friendly cap (Kit's 10k free tier) and the math usually flips inside a quarter. Deliverability is the other quiet issue: post-Intuit, shared-IP reputation has slipped, and the fix Mailchimp recommends is a dedicated IP add-on. Modern alternatives ship strong defaults without the upsell.
Contender A
Customer.io
Event-driven messaging for product-led teams — the technical upgrade from ActiveCampaign.
- SaaS and product teams that want behavior-triggered email, SMS, and push driven by their own data.
- Essentials from $100/mo for 5,000 profiles. Premium from $1,000/mo for larger volumes.
Best for
Pricing
Pros
- Real event-based triggers — react to anything your product sends
- Best-in-class workspaces, branching, and A/B logic
- Email + push + SMS + in-app in one workflow
Trade-offs
- Starts at $100/mo — not for hobby projects
- Requires developer setup to send events; not a drag-and-drop marketer tool
Contender B
Mailchimp
Email marketing platform popular with small businesses.
- SMBs running newsletters and basic automations.
- Free up to 500 contacts. Essentials from $13/mo.
Best for
Pricing
Pros
- Familiar UI
- Wide template library
Trade-offs
- Double-charges duplicates
- Deliverability has slipped
The matrix
Side-by-side
Best for
Customer.io
SaaS and product teams that want behavior-triggered email, SMS, and push driven by their own data.
Mailchimp
SMBs running newsletters and basic automations.
Pricing
Customer.io
Essentials from $100/mo for 5,000 profiles. Premium from $1,000/mo for larger volumes.
Mailchimp
Free up to 500 contacts. Essentials from $13/mo.
Top strength
Customer.io
Real event-based triggers — react to anything your product sends
Mailchimp
Familiar UI
Biggest trade-off
Customer.io
Starts at $100/mo — not for hobby projects
Mailchimp
Double-charges duplicates
The verdict
Which should you pick?
SaaS and product teams that want behavior-triggered email, SMS, and push driven by their own data.
SMBs running newsletters and basic automations.
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