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# Atlas Blue

Atlas Blue sends messages from a real iPhone over real iMessage — not SMS, not email, not a chatbot widget. **92% open rate** and **43% reply rate** (vs. \~5% for traditional SMS).

## How Atlas Blue Campaigns Work

An Atlas Blue Campaign deploys an AI agent that communicates through Apple's iMessage platform. Each campaign is powered by an AI agent with a name, role, knowledge base, and script — tied to a dedicated phone number.

### Campaign Flow

1. A contact sends a message or the campaign initiates outreach
2. The AI agent responds using your configured script and knowledge
3. The conversation is logged in real time
4. The agent continues autonomously until the goal is reached

## Sending Rules

| Rule                               | Detail                                                                                     |
| ---------------------------------- | ------------------------------------------------------------------------------------------ |
| **Contacts who never replied**     | 1 message every 15 minutes, per phone number. Follow-ups count the same as first messages. |
| **Daily caps**                     | Ramp from 10/day to 50/day over the first 8 days after activation                          |
| **Contacts who replied before**    | 2 minutes between messages once the conversation has gone idle                             |
| **Active conversations & inbound** | No limits                                                                                  |
| **First message**                  | No currency, links, phone numbers, or emails until they reply                              |
| **Unique contacts per 24h**        | Apple recommends a maximum of 1,000 per phone number                                       |
| **Sending hours**                  | 9:00 AM to 9:00 PM in your account's time zone, never outside                              |

These limits apply per phone number to outbound messages to contacts who have not replied, including contacts you upload. There is no monthly quota — limits are evaluated on a rolling 24-hour basis. The number of contacts you store is not limited. See [Sending Limits & Queue](/docs/atlas-blue-campaigns/sending-limits-queue) for the full set of limits, daily capacity math, and Report Junk risk.