Mails.ai vs ActiveCampaign
Both sit in email marketing. Here is how they differ on the things you can actually check.
On price: ActiveCampaign starts $5 a month cheaper than Mails.ai ($15 against $20, 25% less). 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.
ActiveCampaign
activecampaign.com
Best known for its visual automation builder — branching, conditional waits, lead scoring and CRM deals in the same product. Aimed at teams that outgrow simple broadcast tools.
| Mails.ai | ActiveCampaign | |
|---|---|---|
| Entry price | $20/mo | $15/mo |
| Entry plan | Pro | — |
| Paid annually | — | — |
| Price checked | 21 Sept 2026 | not verified |
| Pricing model | Free plan | Free trial |
| Free plan | Yes | No |
| Category | Email Marketing | Email Marketing |
| Around since | 2025 | 2003 |
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 ActiveCampaign, answered
- Is Mails.ai cheaper than ActiveCampaign?
- No — ActiveCampaign is the cheaper entry point, at $15 a month against Mails.ai's $20, 25% less.
- Do Mails.ai or ActiveCampaign have a free plan?
- Mails.ai publishes an ongoing free plan; ActiveCampaign does not.
- What is the difference between Mails.ai and ActiveCampaign?
- 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. ActiveCampaign: Best known for its visual automation builder — branching, conditional waits, lead scoring and CRM deals in the same product. Aimed at teams that outgrow simple broadcast tools.
