How the Google Calendar SMS integration works
The SMS Reminder integration connects directly to your Google Calendar and turns each appointment into an automatic text message. Once connected, SMS Reminder reads your upcoming events and — at the times you choose — sends your client a reminder SMS. Clients can reply to confirm, cancel, or ask to reschedule (two-way texting), or tap a confirmation link. There’s no migration and no code: install the add-on, grant read access to your calendar, add a phone number to an event, and reminders start sending.
In short:
- Native integration — reads directly from the Google Calendar you already use, no Zapier bridge.
- Automatic — every appointment with a phone number triggers a reminder on your schedule.
- Two-way — clients reply to confirm, cancel, or ask to reschedule and the app responds automatically, in six languages.
- Fast — most users are sending reminders within about 10 minutes.
Installation guide
Step 1: Install the SMS Reminder add-on
- Visit the SMS Reminder listing in the Google Workspace Marketplace.
- Click Install.
- Grant the required permissions to connect the add-on to your Google account.
Step 2: Open the add-on inside Google Calendar
- Go to Google Calendar.
- Locate the SMS Reminder add-on in the right-hand sidebar.
- Click the SMS Reminder icon to open the app.
Step 3: Add reminders to an appointment
- Open a calendar event.
- Enter the customer’s phone number.
- Choose when reminder messages should be sent.
SMS Reminder will automatically send confirmation and reminder text messages before the appointment time.
Step 4: Save your reminder settings
Once the reminder settings are saved, SMS Reminder will handle the messaging automatically. You can repeat this process for any appointment in your calendar.
Step 5: Let customers book through your booking page (optional)
SMS Reminder also provides a booking page that lets customers book appointments directly. Your booking page connects to your Google Calendar and shows available time slots.
You can share your booking page by:
- sending the link directly to clients
- adding it to your website
- including it in your email signature
When a customer books through your booking page, the appointment is automatically added to your Google Calendar and the same configured reminders send.
Frequently asked questions
Does Google Calendar natively send SMS reminders to clients?
No. Google Calendar can notify you via email or push notification, but it cannot send text messages to clients. A third-party add-on like SMS Reminder is required for SMS delivery.
Do I need a paid Google Workspace account?
No. SMS Reminder works with both personal Gmail accounts and Google Workspace accounts. A paid Workspace subscription is not required.
How does SMS Reminder connect to my Google Calendar?
Via Google’s OAuth system, the same secure login flow used by other Google add-ons and third-party apps. You grant read access; SMS Reminder cannot modify your calendar without your explicit permission.
Will reminders still send if I add events on my phone?
Yes. SMS Reminder reads from your Google Calendar regardless of where events are created: desktop, mobile app, or a connected booking page.
What happens if I uninstall the add-on?
Any reminders already scheduled for upcoming appointments will stop sending. Your Google Calendar events and data are not affected.
How do I set up SMS reminders in Google Calendar?
Install the SMS Reminder add-on from the Google Workspace Marketplace, open it inside Google Calendar, and grant read access to your calendar. Then add a client’s phone number to an event and choose when reminders should send. From that point on, reminders send automatically for your appointments — setup usually takes under 10 minutes.
Can clients reply to the SMS reminders?
Yes. With two-way texting, clients can reply in plain language to confirm, cancel, or ask to reschedule, and SMS Reminder responds automatically (in English, French, Spanish, Italian, Portuguese, and German). They can also confirm or cancel by tapping the link in the message.
