A public booking link is an open door, and bots will find it — filling your calendar with fake appointments and junk emails. Here's how to prevent appointment spam, and how Cal Clear blocks it automatically.
How Booking Spam Happens
Automated scripts crawl the web for booking forms and submit garbage: fake names, throwaway emails, nonsense bookings. Left unchecked, they clutter your calendar and can trigger confirmation emails to unwitting third parties.
The Three Defenses That Work
- Invisible reCAPTCHA v3 — scores each submission's likelihood of being a bot, with no puzzles for real people. See reCAPTCHA on scheduling forms.
- Rate limiting — caps how many bookings a single source can make, stopping floods.
- Email verification — requires the booker to confirm a real email before the slot is held. See email verification for booking forms.
How Cal Clear Applies Them
All three are on by default — no configuration required. Sign in at Cal Clear, and your booking link is spam-protected from the first minute. Importantly, this protection works without tracking your legitimate visitors.
Add Minimum Notice for Good Measure
A minimum notice window further reduces abuse by removing instant-booking slots. Anti-spam is free on every Cal Clear plan.
Frequently Asked Questions
How do I stop spam bookings?
Use a tool with invisible reCAPTCHA v3, rate limiting, and email verification. Cal Clear enables all three by default, so booking links are spam-protected automatically.
Will anti-spam annoy real visitors?
No. reCAPTCHA v3 is invisible (no puzzles), and email verification is a single quick step — legitimate bookings sail through.
Does anti-spam track my visitors?
No. Cal Clear's anti-spam works without behavioral tracking, keeping booking pages private.
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