You want to explore for free first
Its no-card sandbox supports a shared number and up to 10 verified contacts. Its broader API also includes enterprise and specialized messaging features.
Claw Messenger vs Sendblue
Two no-Mac iMessage APIs. Different starting points.
Sendblue pairs a free sandbox with a $100/month inbound-first production line. Claw Messenger starts at $5/month for a managed iMessage, RCS, and SMS API built around one controlled AI-agent thread.
Start the 7-day trialCard required. Cancel before renewal.
Claw Messenger agent pathLive
You want a small, controlled agent thread
Plans start at $5 for 250 messages, with REST sending and outbound WebSocket replies for an agent already running on your server.
Side by side
Sendblue and Claw Messenger compared
| Decision | Sendblue | Claw Messenger |
|---|---|---|
| First test | Free sandbox, no card, shared number, up to 10 verified contacts | 7-day trial, card required, managed route |
| Paid starting point | $100/month per AI Agent line | $5/month for 250 messages |
| Conversation model | AI Agent plan is inbound-first; full outbound is Enterprise | Controlled outbound and inbound threads on self-serve plans |
| Agent connection | REST API, webhooks, MCP, and a community OpenClaw integration | REST API plus official OpenClaw, Hermes, n8n, LangChain, and CrewAI paths |
| Replies | Webhook callbacks and event stream | Outbound WebSocket stream; webhooks for approved managed setups |
| Channels | iMessage, RCS, and SMS with automatic routing | iMessage first, with automatic RCS and SMS fallback |
| Feature breadth | Contacts, carousels, location, TOTP, and separate FaceTime API | Groups, media, reactions, typing, read receipts, and delivery status |
| Published compliance | SOC 2 and HIPAA support listed for Enterprise | No equivalent public compliance claim |
Start with the constraint that could stop the build
Pick Sendblue for free exploration. You can test the API without a card, but the shared sandbox limits you to verified contacts. Production AI Agent service is $100 per line and positioned as inbound-first.
Pick Claw Messenger for a lower-volume working thread. The entry plan costs $5 for 250 messages. The trial lasts seven days and requires a card.
Both remove the Mac. The reply path is the difference.
Sendblue sends inbound events to your webhook and also documents an event stream. That fits teams already operating a public callback endpoint.
Claw Messenger can push replies over an outbound WebSocket connection, so an agent behind a firewall can keep one persistent listener without exposing a public webhook URL.
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