Build an AI assistant that auto-replies to your iMessages using GPT-4. Qualify leads, answer questions, and run full AI conversations — all over iMessage.
A 4-step loop that turns any iMessage conversation into an AI-powered chat. No Apple developer account needed.
Someone texts your Blooio number
Blooio forwards the message to your n8n workflow
GPT-4 generates an intelligent reply
n8n sends the AI response back as an iMessage
Three services, all with free tiers or trials. You can be up and running in 15 minutes.
From zero to AI-powered iMessage replies in four steps.
In your Blooio dashboard, go to Settings → Webhooks. Paste in the webhook URL from your n8n Webhook trigger node. Blooio will POST incoming iMessages to this URL in real time.
// Blooio webhook payload (flat structure)
{
"event": "message.received",
"message_id": "msg_xyz789",
"external_id": "+15551234567",
"internal_id": "+15559876543",
"text": "Hey, what are your hours?",
"status": "received",
"protocol": "imessage",
"timestamp": 1711648200000
}Start with a Webhook trigger node, connect it to an OpenAI node (Chat Model), then finish with an HTTP Request node that calls the Blooio send-message API.
// n8n workflow structure
Webhook Trigger
→ OpenAI Chat Model
→ HTTP Request (Blooio API)
// The Webhook node receives the message
// OpenAI generates the reply
// HTTP Request sends it back via BlooioSet the model to gpt-4o or gpt-4o-mini, add a system prompt that defines your assistant's personality and rules, and set temperature to 0.7 for natural-sounding replies.
// OpenAI node configuration
{
"model": "gpt-4o",
"temperature": 0.7,
"messages": [
{
"role": "system",
"content": "You are a helpful assistant for Acme Co. Be concise — replies should be under 300 characters since they're sent as iMessages. Answer questions about hours, pricing, and services."
},
{
"role": "user",
"content": "{{ $json.text }}"
}
]
}Configure the HTTP Request node to POST to Blooio's send-message endpoint. Map the OpenAI response as the message body and the sender's number as the recipient.
// HTTP Request node → Blooio API
// URL: https://backend.blooio.com/v2/api/chats/{{ encodeURIComponent($('Webhook').json.external_id) }}/messages
// Method: POST
{
"text": "{{ $('OpenAI').json.choices[0].message.content }}"
}
Headers: {
"Authorization": "Bearer YOUR_BLOOIO_API_KEY"
}ChatGPT + iMessage unlocks use cases that SMS and email can't match.
Answer common questions instantly over iMessage. GPT handles FAQs while your team focuses on complex issues. 98% open rates mean customers actually see the reply.
When a new lead texts in, the AI asks qualifying questions — budget, timeline, needs. Score responses and route hot leads to your sales team automatically.
Train GPT on your knowledge base using a system prompt or RAG. Customers text questions and get accurate, on-brand answers without waiting for a human.
Connect your calendar via n8n. The AI checks availability, suggests times, and books appointments — all through natural iMessage conversation.
Build your own AI texting companion. Ask it to draft emails, summarize articles, set reminders, or brainstorm ideas — all from your iMessage app.
Level up your AI iMessage bot with memory, vision, and safety guardrails.
Store messages in a database (Postgres, Supabase, Airtable) keyed by phone number. Before each OpenAI call, fetch the last 10 messages and include them as context. This gives GPT multi-turn conversation ability.
Blooio forwards image attachments as URLs. Pass them to GPT-4o's vision capability to analyze photos — identify products, read receipts, assess property damage, or count calories from meal photos.
Add an IF node in n8n to limit replies per contact (e.g. max 20/hour). Include content moderation in your system prompt and add a filter node to catch harmful outputs before sending.
Run a production AI iMessage bot for under $60/month.
Common questions about connecting ChatGPT to iMessage.
Not natively — Apple doesn't offer an iMessage API. Blooio bridges the gap by providing an iMessage API with webhooks. When someone texts your number, Blooio forwards the message to n8n, which calls OpenAI's API to generate a reply, then sends it back as an iMessage through Blooio.
Blooio starts at $39/month with unlimited messages. OpenAI API usage typically costs $5–20/month depending on volume and model choice (GPT-4 vs GPT-4o-mini). n8n is free to self-host. Total cost for most setups is under $60/month.
No. The entire workflow is built visually in n8n using drag-and-drop nodes. You'll configure a Webhook trigger, an OpenAI node, and an HTTP Request node to call the Blooio API — all without writing code.
Yes. You can store conversation history in a database or n8n's built-in storage. Before each OpenAI call, retrieve the last N messages for that contact and include them in the prompt. This gives GPT full conversation context for natural, multi-turn dialogues.
Start your free trial — build your AI text responder in under 15 minutes. No credit card required.
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