SlotFill

Auto-alert your waitlist when appointments open

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Free plan available

SlotFill overview

Match openings to customer preferences automatically
Alert one customer at a time or everyone who matches
Track link opens and matching confirmed bookings
Test the workflow before your first real cancellation

Keep your appointment calendar moving without watching a waitlist all day. SlotFill is appointment waitlist automation for appointment businesses. Customers join from a responsive site widget and choose the services, staff, dates, and time windows that work for them. When a cancellation, reschedule, or existing availability creates a matching opening, SlotFill checks that the time is still bookable and emails either the earliest eligible customer or all matching customers—using the delivery mode you choose. Customers can check the opening, continue to the site's existing booking flow, or pass. SlotFill rechecks live availability before the handoff. An alert does not reserve the appointment; the site's booking, payment, and checkout flow remains the system of record. From the app dashboard, see active waitlist entries, alert outcomes, setup status, booking-link opens, and matching confirmed bookings. Pause automation, control the alert window, choose one-at-a-time or all-at-once delivery, and export or delete SlotFill-owned data. Designed for individual appointments. Classes, courses, SMS, and automatic booking are not included.

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Pricing & plans

Free plan

Free

10 waitlist entries per month

On-site customer waitlist widget

Email alerts when slots open

80% and monthly limit warnings

Pro plan

15

/month

50 waitlist entries per month

Cancellation and opening alerts

One-by-one or broadcast delivery

80% and monthly limit warnings

Growth plan

32

/month

Unlimited waitlist entries per month

Cancellation and opening alerts

One-by-one or broadcast delivery

Secure Wix booking handoff

* Price is in USD.

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