Calendly vs Acuity: Which Is Better for Managing Cancellations?

If you're running an appointment-based business, you've probably narrowed your scheduling software down to two names: Calendly and Acuity (now Squarespace Scheduling). Both are solid tools for booking. But when it comes to handling cancellations and filling empty slots, they work very differently.

This comparison focuses specifically on what happens after a client cancels — because that's where most businesses lose money.

The Quick Answer

For booking: Both are excellent. Pick based on your other needs (integrations, pricing, payment processing).

For filling cancellations: Neither has a strong native solution. Calendly's waitlist is limited. Acuity doesn't have one at all. If cancellation recovery matters to your revenue, you'll need a dedicated tool like FullSlot that works alongside either platform.

Calendly's Waitlist Feature

Calendly offers a built-in waitlist on their Teams and Enterprise plans. Here's how it works:

When all slots are booked, clients can join a waitlist for that event type
If someone cancels, the first person on the waitlist is notified
They get an email with a link to book the open slot

Pros:

Native integration — no additional tool needed
Simple to enable (toggle in settings)
Free for clients (no app, no login)

Limitations:

Sequential, not simultaneous. Only one person is notified at a time. If they don't respond quickly, the slot may expire before the next person hears about it.
Email only. No SMS notifications. Emails are slower — average open time is hours, not minutes.
No service matching. The waitlist is per event type, but you can't segment by duration or specific appointment attributes.
Enterprise features. Some advanced waitlist options (like round-robin distribution) require the highest-tier plan.

Best for: Businesses with low cancellation volume where filling every slot isn't critical.

Acuity's Approach (or Lack Thereof)

Acuity Scheduling, now owned by Squarespace, does not have a native waitlist feature.

If a slot is fully booked, clients see "no availability" — there's no option to join a queue or request notification when something opens up.

Workarounds people use:

A separate form or email list for "contact me if something opens"
Manual tracking in a spreadsheet
Third-party integrations (Zapier workflows, CRM automations)

The problem: All of these require manual effort when a cancellation happens. You have to notice the cancellation, pull up your list, and send notifications yourself. That delay kills your fill rate.

Best for: Businesses that don't have a cancellation problem — or are willing to accept unfilled slots as a cost of doing business.

Head-to-Head: Cancellation Recovery

Feature	Calendly	Acuity
Native waitlist	Yes (Teams/Enterprise)	No
SMS notifications	No	No
Simultaneous broadcast	No (sequential)	N/A
Service-type matching	Basic	N/A
Automatic detection	Yes	N/A
Fill rate impact	Modest	None

Neither platform is built for aggressive cancellation recovery. They're booking tools first — and waitlist/cancellation features are afterthoughts.

What Actually Fills Cancellations

The businesses that consistently recover 60–70% of canceled slots share a few things in common:

1. Instant notification. The moment a cancellation is detected, clients are notified — not minutes later, not hours later.

2. SMS + email. Text messages have a 98% open rate and are read within 3 minutes on average. Email alone isn't fast enough for same-day slots.

3. Simultaneous broadcast. Everyone on the waitlist is notified at the same time. First to respond gets the slot. No sequential queue that burns time.

4. Service matching. A client who books 60-minute massages doesn't want to hear about a 30-minute opening. Matching by service type and duration increases conversion.

Neither Calendly nor Acuity delivers all four. That's why dedicated cancellation recovery tools exist.

How FullSlot Works With Both

FullSlot connects to Calendly via webhook. When a cancellation is detected:

1. Your waitlist is notified instantly via SMS and email 2. Everyone gets the notification simultaneously 3. First to claim the slot wins 4. Everyone else sees "slot filled" — no confusion, no double-booking

The booking still happens on Calendly. Your workflow doesn't change. FullSlot just handles the notification layer that Calendly's native waitlist can't.

Acuity support is on the roadmap — the integration model is the same. FullSlot detects the cancellation, notifies your list, and clients book directly through your existing system.

Which Should You Choose?

Choose Calendly if:

You want a simple, polished booking experience
You use Google Workspace or Microsoft 365
You need team scheduling features (round-robin, collective events)
You want native video conferencing integration (Zoom, Teams)

Choose Acuity if:

You need built-in payment processing
You want more customization (forms, intake questions)
You're already in the Squarespace ecosystem
You serve clients who book recurring packages

For either platform, add FullSlot if:

Cancellations cost you real money
You have clients who want earlier appointments
You want to fill slots in minutes, not hours
You're tired of manually calling through a waitlist

The Bottom Line

Calendly and Acuity are both capable booking tools. For most appointment-based businesses, either will work fine for scheduling.

But if cancellation recovery is a priority — if empty slots cost you hundreds or thousands of dollars per month — the native features in both platforms fall short. They weren't designed for fast, aggressive slot-filling.

That's the gap FullSlot fills. Literally.

Ready to stop losing revenue to cancellations? FullSlot connects to Calendly and notifies your waitlist the moment a slot opens. Start free →