Fill Cancellations in Minutes, Not Days
Stop losing revenue to last-minute cancellations. Broadcast openings to your waitlist via SMS and let clients claim slots instantly. No phone tag, no back-and-forth emails.
SlotFill: Appointment available!
Tomorrow, Jan 15
2:00 PM - 3:00 PM
*Projected metrics based on pilot testing. Results may vary.
Everything you need to fill last-minute openings
Simple, fast, and designed specifically for therapists
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
Intentionally Simple Workflow
SlotFill works standalone — you create openings when cancellations happen. No complex calendar syncing means fewer headaches and no "double booking" surprises. Most therapists find it takes just 30 seconds to post an opening.
How It Works
Three simple steps to fill your cancelled appointments
Client Cancels
When a client cancels, open SlotFill and create a new opening. Add the date, time, and any notes. Takes about 30 seconds.
Broadcast to Waitlist
Hit the broadcast button. Every client on your waitlist instantly receives an SMS with your available slot and a unique claim link.
Slot Filled
The first client to tap the link claims the slot. You get an instant notification with their details. Done!
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)
HIPAA-Conscious
We store only scheduling data, never clinical notes or PHI
US-Based Servers
Data hosted on secure US infrastructure with SOC 2 compliance
Data Ownership
Export or delete your data anytime. Your client list is yours
What Therapists Are Saying
Join mental health professionals who've recovered thousands in lost revenue
SlotFill has been a game-changer for my practice. I used to lose hundreds of dollars to last-minute cancellations. Now those slots get filled within minutes.
Dr. Sarah M.
PhD, Clinical Psychologist · Austin, TX
My clients love how simple it is. They just tap a link and they're booked. No phone tag, no back-and-forth emails. It just works.
Michael C.
LMFT · Denver, CO
I was skeptical at first, but the first-claim system is surprisingly fair. My waitlist clients appreciate the equal opportunity to grab openings.
Jennifer R.
LCSW · Seattle, WA
Simple, Transparent Pricing
Start free, upgrade when you need more
Free
Perfect for getting started
- 10 SMS per month
- 1 waitlist
- Up to 25 clients
- First-claim system
- Email support
Pro
For busy practices
- Unlimited SMS
- Multiple waitlists
- Unlimited clients
- Analytics dashboard
- Priority support
Team
For group practices
- Everything in Pro
- Up to 5 providers
- Shared waitlists
- Team analytics
- Dedicated support
Frequently Asked Questions
Everything you need to know about SlotFill
When you broadcast an opening, all clients on your waitlist receive an SMS simultaneously 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.
Our system handles simultaneous claims at the database level. Only one client can successfully claim a slot - the one whose request reaches our server first (usually within milliseconds). The other client will see that the slot was already taken and can try for the next opening.
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're designed with HIPAA considerations in mind - we don't store session notes or clinical information, only the minimum contact info needed for scheduling. Your client list stays yours.
By design! We've found that calendar integrations often create more problems than they solve - sync errors, double bookings, and complexity. SlotFill's standalone approach means you're always in control. When a client cancels, you create an opening in about 30 seconds. Simple and reliable.
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.
Ready to stop losing revenue to cancellations?
Join therapists who fill their cancelled slots in minutes, not days.
No credit card required · 10 free SMS/month · Cancel anytime