Mails.ai vs Klaviyo
Both sit in email marketing. Here is how they differ on the things you can actually check.
On price: both start at the same $20 a month. Where a price could not be read from the vendor's page it is marked indicative below.
Mails.ai
mails.ai
Gives an AI agent a real mailbox: inbound arrives as structured reply events carrying a prompt-injection score and sender reputation, with a six-category injection scanner on every message, dedicated IPs and an MCP server. Cold email is refused at the API rather than in the fine print.
Klaviyo
klaviyo.com
Marketing automation that plugs directly into store data — browse and purchase behaviour drive segments, flows and predictive audiences. Heavily used on Shopify.
| Mails.ai | Klaviyo | |
|---|---|---|
| Entry price | $20/mo | $20/mo |
| Entry plan | Pro | — |
| Paid annually | — | — |
| Price checked | 21 Sept 2026 | not verified |
| Pricing model | Free plan | Free plan |
| Free plan | Yes | Yes |
| Category | Email Marketing | Email Marketing |
| Around since | 2025 | 2012 |
1 of these 2 prices were read from the vendor's own pricing page, most recently on 21 Sept 2026; the rest are indicative. Entry tier only — vendors change pricing without notice.
Mails.ai vs Klaviyo, answered
- Is Mails.ai cheaper than Klaviyo?
- Neither. Both start at $20 a month at the entry tier.
- Do Mails.ai or Klaviyo have a free plan?
- Both do. Mails.ai and Klaviyo each publish an ongoing free tier rather than a time-limited trial.
- What is the difference between Mails.ai and Klaviyo?
- Mails.ai: Gives an AI agent a real mailbox: inbound arrives as structured reply events carrying a prompt-injection score and sender reputation, with a six-category injection scanner on every message, dedicated IPs and an MCP server. Cold email is refused at the API rather than in the fine print. Klaviyo: Marketing automation that plugs directly into store data — browse and purchase behaviour drive segments, flows and predictive audiences. Heavily used on Shopify.
