Head-to-head
Customer.io vs FirstSales
Two leading email marketing tools, compared on pricing, features, and editorial fit. Updated for 2026.
FirstSales
AI cold email platform with unlimited mailboxes, warm-up and AI agents
AIFrom $29/mo
Visit FirstSalesAt a glance
| Customer.io | FirstSales | |
|---|---|---|
| Tagline | Messaging that actually fits your data. | AI cold email platform with unlimited mailboxes, warm-up and AI agents |
| Pricing model | Paid | Paid |
| Starts at | $100/mo | $29/mo |
| Founded | 2012 | — |
| AI-native | ||
| Categories | Email Marketing, Automation | Lead Gen & ABM, Sales Engagement, Email Marketing |
| Vendor claimed |
Quick take
Pick Customer.io if you need messaging that actually fits your data. Pick FirstSales if you need ai cold email platform with unlimited mailboxes, warm-up and ai agents.
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Frequently asked
- Is Customer.io better than FirstSales?
- It depends on your use case. Customer.io is messaging that actually fits your data, while FirstSales is ai cold email platform with unlimited mailboxes, warm-up and ai agents. See the comparison above for which fits your team.
- What's the price difference between Customer.io and FirstSales?
- Customer.io starts at $100/mo. FirstSales starts at $29/mo.
- Can I migrate from Customer.io to FirstSales?
- Most tools in this category support data import via CSV. For complex migrations, both vendors offer onboarding assistance on higher-tier plans.