Mails.ai vs Regie.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.

Regie.ai makes RegieGO, a web workspace for sales prospecting that brings contact sourcing, call preparation, email drafting, and follow-up together. It learns a seller’s voice and company pitch, finds account-specific reasons to reach out, and drafts personalized messages. Prospecting plays coordinate phone, email, and LinkedIn touchpoints. The dialer supports local presence, Do Not Call enforcement, and up to nine lines. RegieGO sends through connected Gmail or Outlook accounts; connecting a mailbox can also show calendar meetings in the workspace. CRM connections include HubSpot, Salesforce, and Monday CRM, with one CRM per workspace. Drafts can draw on Gong or Attention call transcripts and Seismic approved content. Contact enrichment uses multiple providers and deducts a credit only when a provider returns data. The free plan includes 250 one-time credits per person, shared by up to 10 people. Pro is $49/mo with monthly billing or $41/mo with annual billing; Team is $125/seat/mo annually, with two seats minimum. The service is intended for US-based business use and processes personal information in the United States.