Customer.io vs Mailchimp
Side-by-side plans, pricing, and feature gates for Customer.io and Mailchimp, verified . Customer.io is primarily marketing automation; Mailchimp is primarily email marketing.
Plans side by side
Every published plan from each vendor, with the headline monthly anchor price. Some prices scale with subscriber count or seats; full detail lives on each tool's page.
Customer.io
- Essentials
Entry tier with the visual workflow builder
$100/mo - Premium
Custom volume, HIPAA available, daily routines
$1,000/mo - Enterprise
Best volume pricing with dedicated infrastructure
Custom
Mailchimp
- Free
Up to 250 contacts, 500 sends/month
Free - Essentials
Entry paid tier with A/B testing
$13/mo - Standard
Most popular paid tier
$20/mo - Premium
For high-volume senders and bigger teams
$350/mo
Limits at the entry paid tier
Compares Essentials (Customer.io) against Essentials (Mailchimp). Both are the lowest-priced non-free, non-custom plan on each side.
| Limit | Customer.io | Mailchimp |
|---|---|---|
| Contacts | 5,000 profiles (people plus objects) | 500 contacts (anchor; scales up) |
| Emails / month | 1,000,000 | 5,000 sends (10x contacts) |
| Team seats | 1 | 3 |
| Automations | · | 4 flow steps |
| Campaigns | · | 3 audiences |
When Customer.io wins
- B2C and B2B teams with custom objects in their data model (accounts, subscriptions, devices) who need messaging tied to those entities
- Product-led businesses sending behavior-triggered lifecycle messaging across email, SMS, and push
- Teams needing HIPAA compliance for healthcare or digital-health workflows
Where Customer.io is the wrong fit
- Solo creators and newsletter operators (Kit or beehiiv are the right shape)
- Small businesses that need a $0/month or $20/month entry point (MailerLite or Mailchimp Free fit better)
- Teams that want a one-click WYSIWYG email tool with no data modeling required
When Mailchimp wins
- Small businesses that want one tool with a real onboarding flow and a huge integration list
- Teams already living in Intuit (QuickBooks) products
- Operators who want a brand-name vendor for stakeholder approval
Where Mailchimp is the wrong fit
- Creators with growing newsletters; the per-contact tax compounds (Kit, beehiiv, or MailerLite tend to be cheaper at 10k+ subscribers)
- B2B sales teams; the CRM is light versus HubSpot or ActiveCampaign
- Teams needing predictive AI on a budget; you have to jump to the $350 Premium plan
Common questions
- Is Customer.io cheaper than Mailchimp?
- At the entry tier, Mailchimp starts at Free versus Customer.io at $100/mo. Mailchimp is cheaper at the entry. Pricing scales differently above that, so check the full plan grid.
- Does Customer.io or Mailchimp have a free plan?
- Only Mailchimp has a permanent free plan. Customer.io only offers a free trial.
- Are Customer.io and Mailchimp in the same category?
- No. Customer.io is primarily a marketing automation tool; Mailchimp is primarily a email marketing tool. They overlap on use case but sit in different primary categories, so the comparison is between adjacent tools rather than direct competitors.
- Which has more plans, Customer.io or Mailchimp?
- Mailchimp ships 4 plans; Customer.io ships 3. Mailchimp's longer ladder gives more granular upgrade steps, which can mean smoother price escalation as your team scales.
- Where can I see alternatives to Customer.io or Mailchimp?
- Each tool has a dedicated alternatives page on TierGauge with ranked options and verified pricing: /alternatives/customer-io for Customer.io and /alternatives/mailchimp for Mailchimp. Alternatives are derived from each tool's editor-flagged competitors plus same-category tools we track.
Customer.io: https://customer.io/pricing/ · Mailchimp: https://mailchimp.com/pricing/marketing/
Last verified . Pricing changes between refreshes; confirm at the vendor before purchasing.