Comms by Osis

Overview

Comms is a hosted messaging API and team inbox from Osis. It sends and receives iMessage, SMS, RCS on eligible lines and WhatsApp from one phone number, with hosted AI agents, human handoff and a hosted MCP server. No Mac is needed, and you can create an API key without talking to sales.

Key features

• Auto routing that tries iMessage, then RCS, then WhatsApp, then SMS from the same number
• Tapbacks and custom emoji reactions, threaded replies, typing, read receipts, unsend and polls
• Group chat creation, contact cards, iMessage name and photo sharing, and experimental chat backgrounds
• Capability check for iMessage, RCS and WhatsApp by phone number or email
• Read locations that contacts share with a dedicated line
• Answer inbound phone and FaceTime calls by API, stream FaceTime audio and record voicemail
• Signed webhooks, scoped API keys, number porting and a line-claiming API
• Checkout links through Shopify and Whop

Pricing

• Free: $0 on a shared platform line, 100 messages a day
• Plus: $50 a month on a shared line
• Dedicated: $200 a month per number, $0 setup, up to 7,000 messages a day
• Enterprise: custom

AI usage for hosted agents is billed separately through Comms credits or your own OpenRouter account. Answered calls are billed per minute.

How it compares to Linq

Both route iMessage, RCS and SMS through one API with signed webhooks and an MCP server, and both support polls, typing indicators, read receipts and group chats. Linq Pro starts at $260 a month, Linq publishes TypeScript, Python and Go SDKs, and holds SOC 2 Type II. Comms has a free shared line, dedicated numbers at $200 a month, WhatsApp on the same number, hosted agents and inbound call handling; no official SDK or SOC 2 report was found on its site.

Best for

Teams that want iMessage and WhatsApp agents on one number, using a hosted agent or their own.

Sources

• comms.osis.co
• comms.osis.co/llms.txt
• comms.osis.co/pricing
• comms.osis.co/product-facts
• comms.osis.co/platform
• comms.osis.co/faq
• comms.osis.co/compare/blooio
• comms.osis.co/guides/sell-imessage-ai-agents
• comms.osis.co/manifesto
• comms.osis.co/privacy
• docs.osis.co/llms.txt
• docs.osis.co/llms-full.txt
• docs.osis.co/openapi.json
• docs.osis.co/messages-api/send-message
• docs.osis.co/messages-api/react-to-message
• docs.osis.co/messages-api/unsend-message
• docs.osis.co/messages-api/send-poll
• docs.osis.co/messages-api/create-group-chat
• docs.osis.co/messages-api/send-contact-card
• docs.osis.co/messages-api/set-contact-card
• docs.osis.co/messages-api/typing
• docs.osis.co/messages-api/chat-backdrop
• docs.osis.co/messages-api/mark-conversation-read
• docs.osis.co/messages-api/check-capabilities
• docs.osis.co/messages-api/shared-location
• docs.osis.co/messages-api/line-porting
• docs.osis.co/messages-api/claim-line
• docs.osis.co/messages-api/list-messages
• docs.osis.co/messages-api/list-conversations
• docs.osis.co/messages-api/list-events
• docs.osis.co/messages-api/authentication
• docs.osis.co/guides/webhooks
• docs.osis.co/guides/calls
• docs.osis.co/guides/mcp
• docs.osis.co/guides/rcs
• docs.osis.co/guides/highlevel
• docs.osis.co/guides/errors-and-rate-limits
• docs.osis.co/payments-api/overview