lemlist vs Mails.ai
lemlist
lemlist.com
Mails.ai
mails.aiSide by side
| Figure | lemlist | Mails.ai |
|---|---|---|
| Price from | $16/mo | $20/mo |
| Free plan | — | Yes |
| Free trial | Yes | — |
| Open source | — | — |
| Web | Yes | Yes |
| API | Yes | Yes |
| Plans published | 5 | 3 |
| Spec score · Cold Email Software | 8.3 (#10) | 8.2 (#11) |
| Product | lemlist describes itself as an AI-powered sales engagement platform for finding leads, personalizing outreach, and running multichannel campaigns. | Mails.ai provides email infrastructure and a programmatic email API for AI agents to send, receive, and parse email. |
| Support | Paid plans list in-app live support, while Enterprise includes priority support and a dedicated account manager. | The pricing page includes email support on Pro and priority support on Scale. |
Plans
lemlist
- Lead data enrichment add-on$16 a month
- Buying intent signals add-on$21 a month
- Email$55 a month
- Multichannel$87 a month
- EnterprisePriced on request
In their own words
Mails.ai
Mails.ai provides email infrastructure and an API for AI agents to send, receive and parse transactional or conversational email. It is available on the web and through an API, with REST, webhooks, an MCP server, and TypeScript and Python SDKs. Inbound replies arrive as structured payloads containing sender, subject, body, headers and attachments, as well as an injection score and sender reputation. All plans scan inbound messages for prompt injection; optional classification can extract intent, entities and urgency for $0.003 per inbound. Listed integrations include Claude Code, Cursor, Cline, Continue, Windsurf, OpenAI Agents SDK, Anthropic SDK, LangGraph, Mastra, Vercel AI SDK and Pydantic AI. The maker describes the product as early, live and self-serve, and says the API refuses cold outreach. Free costs nothing for 3,000 events and one agent. Pro is $20 a month; Scale is $99 a month. Sends stop at a plan's monthly cap; excess inbound replies are stored but not scanned or sent to the webhook. The maker says it lacks SOC 2 today and does not include HIPAA in Phase 1 scope.