Send Appointment Reminders via iMessage

The Problem

Patient and customer no-shows cost US businesses an estimated $150 billion per year. A missed appointment is lost revenue you can never recover — and the slot often goes unfilled even if you have a waitlist, because by the time you know someone is not coming, it's too late to fill it.

Manual reminder calls don't scale. Your staff spends hours every week calling patients who don't pick up, leaving voicemails that never get heard. That time is expensive, and the return is poor.

Email reminders have 20% open rates. Text messages have 98%. If you're sending appointment reminders by email, most of your customers aren't seeing them. The medium is the problem, not the message.

The senderZ Solution

senderZ lets you send automated appointment reminders via iMessage — with automatic SMS fallback for recipients without iMessage — either through the API for developers, or directly through Simple Mode if you don't write code. Create your reminder message once, set when it should go out, and senderZ handles delivery automatically.

Schedule reminders hours or days in advance. Quiet hours are enforced automatically — marketing messages are never sent between 8pm and 8am in the recipient's timezone. Two-way messaging means customers can reply to confirm or ask to reschedule, and you see the replies in your dashboard.

curl -X POST https://api.senderz.com/v1/messages \
  -H "Authorization: Bearer YOUR_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "to": "+15551234567",
    "channel": "auto",
    "template": "appointment_reminder",
    "data": {
      "name": "Sarah",
      "date": "Tuesday, March 31",
      "time": "2:00 PM",
      "location": "123 Main St"
    },
    "scheduled_at": "2026-03-30T14:00:00Z"
  }'

Key Features

• Template system — Create "Your appointment is on [Date] at [Time]" once and reuse it forever. Update the template and every future reminder reflects the change instantly.
• Scheduled sending — Set messages to go out 24 hours before an appointment, 2 hours before, or any interval you choose. Scheduling is handled by senderZ — your server doesn't need to stay running.
• Quiet hours — Marketing messages automatically respect the 8pm–8am quiet window in the recipient's local timezone. You never have to worry about accidentally messaging someone at midnight.
• Two-way messaging — Patients and customers can reply directly to confirm, cancel, or ask questions. Replies appear in your senderZ dashboard and can trigger webhooks to your booking system.