Never lose a canceled Calendly slot again.
When a client cancels, SlotBack instantly texts your waitlist. The first person to claim it books the slot — no manual scrambling.
For practitioners booked out a week or more, where a cancellation means real lost revenue — not an empty calendar.
No product yet — I'm validating demand. I'll email you when there's something to try.
Every open slot is money you're not making
A cancellation is lost revenue
Most slots that open up never get rebooked. That's an hour of income gone, every time.
Manual texting eats your day
Messaging clients one by one about an opening isn't worth the time it takes.
Calendly has no waitlist
Square and Acuity both do. Calendly users have been asking for years.
Is this costing you?
Count your cancellations
Pull your last 60 days from Calendly.
Keep the recoverable ones
Only the ones 24+ hours out — last-minute cancellations are gone regardless.
Do the math
Multiply that number by your average booking value.
That's what a waitlist would be recovering.
How it works
Connect your Calendly
One click, no setup work.
Clients join your waitlist
Whenever your times are full.
The slot refills itself
A cancellation texts your waitlist automatically.
Who this is actually for
Built for you if…
- Booked out a week or more.
- You regularly turn people away.
- Clients ask to be told if something opens up.
Probably not for you if…
- You usually have same-week availability.
- Cancellations are rare.
- You fill slots easily.
Be first in line when it launches
No spam. One email when the beta opens.