Head-to-head
Customer.io vs Mailook
Two leading email marketing tools, compared on pricing, features, and editorial fit. Updated for 2026.
At a glance
| Customer.io | Mailook | |
|---|---|---|
| Tagline | Messaging that actually fits your data. | Free email deliverability checker for SPF, DKIM, DMARC and blacklists |
| Pricing model | Paid | Free |
| Starts at | $100/mo | Free |
| Founded | 2012 | — |
| AI-native | ||
| Categories | Email Marketing, Automation | Email Marketing, Reviews & Reputation |
| Vendor claimed |
Quick take
Pick Customer.io if you need messaging that actually fits your data. Pick Mailook if you need free email deliverability checker for spf, dkim, dmarc and blacklists.
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Customer.io alternatives →
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Frequently asked
- Is Customer.io better than Mailook?
- It depends on your use case. Customer.io is messaging that actually fits your data, while Mailook is free email deliverability checker for spf, dkim, dmarc and blacklists. See the comparison above for which fits your team.
- What's the price difference between Customer.io and Mailook?
- Customer.io starts at $100/mo. Mailook starts at Free.
- Can I migrate from Customer.io to Mailook?
- Most tools in this category support data import via CSV. For complex migrations, both vendors offer onboarding assistance on higher-tier plans.