How to Send WhatsApp Reminders for Calendly Bookings (The Missing Feature)

Calendly is excellent for booking. It eliminates the back-and-forth, syncs with your calendar, and gives clients a clean self-booking experience. But it has one significant gap: its reminder system relies almost entirely on email.

Email reminders from Calendly do go out. But email open rates hover around 20–25%, and for booking confirmation emails they often end up in promotions folders or are skimmed and forgotten. By the time the appointment arrives, many clients have no memory of the reminder.

WhatsApp messages are read by approximately 95% of recipients, usually within minutes of delivery. If you're using Calendly and not sending WhatsApp reminders on top of it, you're leaving a significant no-show reduction on the table.

Why Calendly's Built-In Reminders Fall Short

Calendly's reminder workflow sends an initial booking confirmation, an optional follow-up reminder, and a cancellation notice — all by email. For clients who actively manage their email and use calendar integrations, this is fine. For most people, it isn't.

The problem isn't that email reminders are poorly designed. It's that email is not where most people have their attention during the day. WhatsApp is. Messages arrive in real time, feel personal, and get read. A Calendly booking confirmation is easy to archive and forget; a WhatsApp reminder at 24 hours before is nearly impossible to miss.

There is also no two-way communication in Calendly's email reminders. The client reads (or doesn't read) the email, but cannot CONFIRM or CANCEL with a single tap. Two-way confirmation — where clients actively reply — increases show rates significantly because confirmation creates commitment.

How to Add WhatsApp Reminders to Calendly

The solution is to connect Calendly to Remindly, which handles WhatsApp reminders for every booking automatically.

Here's how it works:

Calendly + Remindly integration: When a client books through your Calendly link, Remindly receives the booking details via integration. It then sends that client two WhatsApp reminders — one 24 hours before the appointment and one 1 hour before — using the phone number the client provided at booking.

To make this work, you need to add a phone number field to your Calendly event type. In Calendly, go to your event type settings → Invitee Questions → add a phone number field and mark it as required. From that point, every person who books through Calendly enters their phone number, and Remindly uses it to send the WhatsApp reminders.

Setup steps:

1. Add a phone number question to your Calendly event type
2. Connect your Calendly account to Remindly (OAuth flow, about 30 seconds)
3. That's it — Remindly watches for new bookings and schedules reminders automatically

The full setup takes about 2–3 minutes.

What the Client Experience Looks Like

Your client books through Calendly as usual. They receive the standard Calendly confirmation email. Then, 24 hours before the appointment, they receive a WhatsApp message:

"Hi [Name], just a reminder that your call with [Business Name] is tomorrow at [time]. Reply CONFIRM to confirm or CANCEL if you need to reschedule."

They reply CONFIRM in one tap. You see the confirmation in your Remindly dashboard. One hour before the meeting, they get a final reminder.

The Calendly experience is unchanged. The reminder experience is dramatically better.

Who This Is Most Useful For

Calendly is used across many contexts, and WhatsApp reminders add value in most of them:

Consultants and coaches who book calls or sessions through Calendly often deal with 10–20% no-show rates for free discovery calls, and 5–10% for paid sessions. A WhatsApp reminder the day before significantly reduces both.

Freelancers and agencies running client calls — strategy sessions, onboarding calls, project reviews — where a missed slot means rescheduling across multiple calendars and teams.

Healthcare and wellness practitioners who use Calendly for patient scheduling where the appointment is time-sensitive and no-shows have clinical consequences.

Sales teams using Calendly for demos and discovery calls. A missed demo call is a lost sales opportunity. WhatsApp reminders reduce no-shows in the sales funnel just as they do in service businesses.

Calendly vs. Google Calendar: Does It Matter?

If you switch between tools — using Calendly for client-facing bookings and Google Calendar for internal scheduling — Remindly handles both. For Google Calendar appointments, you add the client's phone number to the event description. For Calendly, the phone number is captured at booking via the invitee question.

You can run both integrations simultaneously. All reminders appear in the same Remindly dashboard.

What It Costs vs. What You Save

Remindly plans start at $29/month with a free plan available. For any professional who bills by the hour or session, a single recovered no-show per week more than covers the cost.

The specific calculation depends on your rate and volume, but the principle is the same: if a client no-show costs you $50, $100, or $200 in lost billable time, and WhatsApp reminders cut your no-show rate by 40–60%, the tool pays for itself many times over every month.

For sales teams, the math is even more favorable — a single demo that doesn't no-show, that converts, can be worth thousands.

Get Started

If you're using Calendly and your clients aren't getting WhatsApp reminders, fix that in 2 minutes.

Connect your Calendly account to Remindly — free plan available. Your next booking will already have WhatsApp reminders scheduled.