SMS Reminder Features: Two-Way Texting, Booking & Google Calendar Sync

2,000+ businesses send reminders with SMS Reminder

2,000+Businesses
5M+Reminders sent
786K+Installs on Google Workspace
100+Countries supported

★★★★★
“It syncs seamlessly with Google Calendar and sends automatic text message reminders. The setup is fast and easy, even for people who aren't very tech-oriented.”

Russell Cravens · Verified review
★★★★★
“Game changer for my patients and I. It automatically sends out reminders for upcoming sessions, which has greatly reduced missed appointments and last-minute cancellations.”

Maurine Demetrius · Verified review
★★★★★
“I've completed my own testing of this app and it does exactly what it says it does. I am so impressed that I will be subscribing to the paid version.”

James Handelin · Verified review

Reviews verified on the Google Workspace Marketplace

SMS reminders

Automatically text clients before every appointment

Set up your message templates once. SMS Reminder sends confirmations, reminders, and follow-ups automatically based on your Google Calendar — no manual sending required.

✓
Three message types — send a confirmation when an appointment is booked, a reminder before it starts, and a follow-up once it ends. Each type is optional and independently configurable.
✓
Flexible timing — choose from preset timings (30 min, 1 hour, 24 hours) or set a custom number of days, hours, or minutes for any message.
✓
Reminders that activate themselves — SMS Reminder finds the client's mobile in the calendar event and sets the reminder up for you, showing which number it chose and why. Undo any time before it sends. More on automatic activation.
✓
Clients can reply or tap a link — every reminder can carry both, so clients confirm or cancel whichever way they prefer. More on two-way texting.
✓
Dynamic fields — insert {date}, {time}, {location}, {title}, and more so every message includes the right appointment details.

9:41●●●● 5G

Lumi Wellness

+1 (555) 010-2049

Hi Sarah! Reminder: your appointment is tomorrow at 2:00pm with Lumi Wellness. To confirm or cancel: smsrmdr.app/c/a1b2c3

Yes, see you then

Two-way texting

Clients reply. SMS Reminder answers.

Most reminder apps talk at your clients. SMS Reminder talks with them. When your reminder arrives, clients can text back in their own words — and the app reads the reply, responds, and updates your calendar without you touching anything.

✓
No keyword to remember — clients reply however they'd normally text. “Yes”, “OK”, “can't make it”, a thumbs-up. You don't need to write “Reply YES” into your templates.
✓
Replies handled in six languages — automatic responses in English, French, Spanish, Italian, Portuguese, and German.
✓
Your calendar updates itself — a confirmation turns the event green, a cancellation turns it red, and anything still unanswered stays yellow. Visible directly in Google Calendar.
✓
Reschedules land on your booking page — if a client asks to move their appointment, SMS Reminder responds and sends them to pick a new time from your real availability, so the calendar stays accurate.
✓
The link still works too — clients who'd rather tap than type can use the confirm or cancel link in the same message. Both are always available.

How two-way texting works →

Online booking

Let clients self-book directly into your Google Calendar

Share a booking link, set your availability, and let clients pick a time that works. Every booking syncs straight to your Google Calendar.

✓
Shareable booking page — send the link by email, add it to your website, or share it anywhere clients can access it.
✓
Your logo and brand colour — add your logo and one brand colour to your booking page and booking widget, so clients see your business, not ours. Included on every plan.
✓
Location and Google Meet — give each appointment type an address, a phone call, the client’s address or a Google Meet video call, with a new Meet link created for every booking.
✓
Appointment types — create different types with different durations, rules, and reminder settings. Each type can link to a different Google Calendar.
✓
Availability and buffers — set your open hours, add closed dates, and configure minimum notice periods and buffer time between appointments.
✓
Client rescheduling — let clients move their appointment to another open time from the confirmation page, and switch it off for any appointment type.
✓
Automatic reminders for bookings — choose an SMS reminder template for each appointment type and reminders are scheduled for every new booking made through it.
✓
Add to your website — link a “Book Now” button to your booking page, or use the WordPress plugin.

How the booking page works →

Google Calendar

Works inside the calendar you already use

SMS Reminder connects to Google Calendar and stays out of your way. No new calendar to learn, no migration, no extra tools to manage.

✓
Multiple calendars — connect more than one Google Calendar and link different reminder templates to each. Calendar limits vary by plan.
✓
Calendar colour-coding — when appointment confirmations are enabled, your calendar events update automatically: confirmed turns green, cancelled turns red, pending stays yellow.
✓
Template per calendar — different calendars can use different default message templates with no manual selection needed.
✓
Works with any Google Workspace account — no paid Google Workspace subscription required. Sign in with your Google account and connect.

Calendar status

Sarah K. — Initial consult

Mon 10:00 AM

Confirmed

Marcus T. — Follow-up

Tue 2:00 PM

Pending

Priya N. — Review

Wed 11:30 AM

Cancelled

All features

Built for the way small businesses work

Message types

Confirmation messages

Sent when an appointment is booked or updated. Re-sent automatically if the date or time changes.

Reminder messages

Sent before the appointment starts. Set multiple reminders per appointment at different lead times.

Follow-up messages

Sent after the appointment ends. Useful for reviews, rebooking prompts, or post-appointment instructions.

Templates and timing

Multiple templates

Create different templates for different services, locations, or appointment types.

Per-calendar templates

Link a specific template to each Google Calendar so reminders apply automatically without manual selection.

Per-appointment overrides

Change the template or message for a specific appointment without affecting your defaults.

Custom timing

Choose from preset timings or set a custom number of days, hours, or minutes for any message type.

Automation and control

Automatic reminder activation

When a calendar event has one clear client mobile and you have approved automation, SMS Reminder activates the reminder itself — no opening the appointment.

Auto-activated badge

Every automatic activation shows which number was chosen and the reason, so you can check the app's reasoning rather than take it on trust.

Undo and activity feed

Undo any auto-activated reminder before it sends, and review every one of them in a single activity feed.

Corrections that stick

Use “Got it wrong” once and SMS Reminder forgets the old number and uses the corrected one from then on. Editing an event revalidates the number and reverts to asking you.

Confirmations and tracking

Confirm or cancel by reply or link

Clients can reply to their reminder to confirm, cancel, or ask to reschedule and the app responds automatically — or tap a link to confirm or cancel. Whichever they prefer.

Calendar colour-coding

Confirmed appointments turn green, cancelled turn red, pending stay yellow — visible directly in Google Calendar.

Dynamic message fields

Insert {date}, {time}, {location}, {title}, and more. Reminders populate with real appointment data automatically.

Usage calculator

The built-in calculator shows character count, segment usage, and estimated monthly reminder consumption as you type.

Four ways to use it

Use SMS Reminder however works for you

All four methods connect to the same account, templates, and settings.

📅

Google Calendar Add-on

Install from Google Workspace Marketplace and set reminders directly in your calendar sidebar. No tab-switching required.

🌐

Web App

🔌

Chrome Extension

Install the Chrome extension to manage reminders inside Google Calendar on the web — works on desktop and mobile browsers.

#hashtag# format

Add a client's phone number between # symbols in any calendar app event. SMS Reminder detects it and sends the reminder automatically.

★★★★★

“It syncs seamlessly with Google Calendar and sends automatic text message reminders. The setup is fast and easy, even for people who aren't very tech-oriented.”

Russell Cravens · Verified review

“Game changer for my patients and I. It automatically sends out reminders for upcoming sessions, which has greatly reduced missed appointments and last-minute cancellations.”

Maurine Demetrius · Verified review

“I've completed my own testing of this app and it does exactly what it says it does. I am so impressed that I will be subscribing to the paid version.”

James Handelin · Verified review

Everything your calendar needs to run itself.