A client just cancelled their 2pm. Someone on your waitlist would take it in a heartbeat.
SlotFill texts your waitlist the moment a slot opens. First to respond gets it. No apps to download, no accounts to create.
The Cost of Empty Slots
You already know this feeling
You check your schedule and there it is — a gap where a client used to be. They texted this morning. Something came up.
Now you've got an hour with no revenue and a waitlist full of people who'd love that spot. But you're between appointments, your front desk is handling check-ins, and by the time anyone gets to a phone, the slot is 45 minutes away.
So it sits empty. Again.
What if your waitlist worked for you?
When a slot opens, tap once. A text goes out to everyone who'd want it. The first person to reply "YES" gets it.
No phone tag. No back-and-forth. No "let me check and get back to you." Just: slot opens, text goes out, slot fills.
Built for how appointment-based businesses actually work
Last-minute cancellations are a fact of life. Clients get sick, schedules change, things come up. SlotFill doesn't try to prevent cancellations — it fills them before the revenue is lost.
Your waitlist already exists — maybe in a spreadsheet, maybe in someone's head, maybe on sticky notes. SlotFill just makes it work automatically when you need it.
No app for clients to download. It's a text message. They reply YES or ignore it. That's the whole interaction on their end.
Works alongside whatever scheduling tool you already use. No integrations required, no setup headaches.
Everything you need to fill last-minute openings
Simple, fast, and works for any appointment-based business
Instant Broadcast
Send SMS to your entire waitlist in seconds when a slot opens up
Never lose revenue to last-minute cancellations
First-Claim Wins
Fair system where the quickest responder gets the appointment
Fair and transparent for your clients
Simple for Clients
One-tap claim link. No apps to download, no accounts to create
Higher response rates with zero friction
How It Works
Three simple steps to fill your cancelled appointments
Client Cancels
Create an opening in 30 seconds
Broadcast
SMS sent to your waitlist instantly
Slot Filled
First to tap claims it
Built with Privacy in Mind
Your client data stays secure. Period.
Encrypted Data
All data encrypted in transit (TLS 1.3) and at rest (AES-256)
US-Based Servers
Data hosted on SOC 2 certified US infrastructure (Supabase, Vercel)
Data Ownership
Export or delete your data anytime. Your client list is yours
Sound Familiar?
These are the problems SlotFill solves
"I hate playing phone tag with my waitlist"
Calling down a list is tedious. Most people don't answer anyway.
"By the time I reach someone, the slot is gone"
Speed matters. The first available client should get the spot.
"Empty slots = lost revenue"
Every cancellation that stays unfilled is money left on the table.
One empty appointment costs you $100+. SlotFill costs $39/month. Fill one extra slot and it pays for itself.
Start free, upgrade when you need more
Free Trial
Try everything with no commitment
- 50 SMS included (~5 cancellations)
- Unlimited waitlists
- Unlimited clients
- First-claim system
- Full access to all features
Pro
Everything you need to fill cancellations
- 300 SMS per month (~30 cancellations)
- Unlimited waitlists
- Unlimited clients
- Analytics dashboard
- Email support
- Buy extra SMS anytime
Frequently Asked Questions
Everything you need to know about SlotFill
When you broadcast an opening, all eligible clients on your waitlist receive an SMS with a unique claim link. The first person to tap the link and confirm claims the slot. Everyone else sees a 'slot already claimed' message. It's fair, fast, and transparent.
No! That's one of the best parts. Clients receive a simple SMS with a link. They tap it, see the appointment details, and tap again to confirm. It works in any mobile browser - no app downloads, no account creation, no passwords to remember.
Absolutely. We use industry-standard encryption for all data in transit and at rest. We don't store session notes or clinical information, only the minimum contact info needed for scheduling. Your client list stays yours.
You have two options: add clients manually through your dashboard, or share your unique waitlist join link. Clients can add themselves via that link - they just enter their name and phone number. You can review and manage all waitlist members anytime.
Your waitlist is sitting idle. Your cancellations are sitting in empty hours. Connect the two.
Start your free 30-day trial.
No credit card required · 50 SMS included · Cancel anytime