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Chert

iMessage infrastructure for reaching people at scale

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Chert is a platform for building and deploying AI agents on iMessage, enabling applications to hold trusted, personalized conversations with people at scale. It makes iMessage programmable, supporting blue-bubble threads from verified numbers with typing indicators, reactions, reply context, read receipts, and multi-recipient threads with named senders. When a recipient is not on iMessage, messages fall back to SMS or RCS, with the channel surfaced in the API.

The platform provides a REST API and webhooks for message events, along with native sync for common cases such as lead creation, meeting booking, and opt-out handling. Attachments including PDFs, links, voice notes, and contact cards can be sent within the same thread. Chert targets workflows where a message becomes an action, such as onboarding, customer support, and B2C agents handling bookings and reschedules. It is packaged around a kickoff session for integration, with API documentation available for developers.

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