A waitlist for fully booked Calendly events that automatically notifies waiting clients when a slot becomes available
Stage
Not given
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Founded
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Based in
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Pricing model
Paid
Free trial
Pricing
SlapMail: $8/user/month (billed yearly). SlapPortal: plans start at $12/month (billed yearly) for up to 5 active users and scale from there. Both include free trial with no credit card required.
$15 per month after a 14-day free trial with no card required. One plan covers one Calendly account with waitlists for all event types, instant email offers on every cancellation and reschedule, day and time preferences for clients, and a dashboard showing slots refilled from the waitlist.
Key features
Sync Gmail and Outlook emails to Notion automatically
Reply to emails from Notion
Smart email routing based on labels and folders
Automatic contact linking
Attachment storage in Notion
Share inboxes across teams
Property-level access control for portals
Real-time bidirectional sync
No separate interface to build
Works with free Notion accounts
Automatic cancellation and reschedule detection through Calendly webhooks
Instant email notifications to waiting clients with direct booking links
Client preference selection for specific days and times
First-come-first-served booking with fallback page for missed slots
Dashboard with waitlist metrics and refill tracking
Shareable waitlist link with badge and QR code options
Automatic minimum 60-minute notice for slot offers
Secure OAuth login without exposing Calendly password
One-click unsubscribe link in every email notification
Automatic waitlist removal when clients book successfully
What makes it different
Built specifically for Notion workflows
One source of truth for sales, support, and client work
No data duplication between workspace and portal
Google CASA Tier 2 certified and Microsoft-verified
Content never permanently stored outside Notion
Works directly with Calendly without requiring a separate booking page
Respects client scheduling preferences to send only relevant offers
Fills cancelled slots faster than manual follow-up through automated emails
Slap
WaitlistPing