Step 1
Import the live feed
Use the same OTA or PMS URL your production workflow already consumes.
Behavior-first calendar validation
Test iCal sync before it causes double bookings.
Prove whether the problem is the source feed, the import step, or the final blocked-night behavior before availability drifts into production.
- No credit card required
- Works with any iCal URL
- Built for Airbnb, Booking.com, VRBO, and PMS teams
Free to start · No credit card · Validate real blocked-night outcomes
Free to start
Import live feeds
Force sync instantly
Compare final availability
How it works
A workflow that matches real OTA support and PMS debugging.
Step 2
Force a sync
Check logs, bytes, imported event counts, and current source behavior immediately.
Step 3
Compare the timeline
Validate blocked nights and overlaps instead of stopping at syntax or raw VEVENT text.
Start in minutes
See your first feed in the dashboard in under a minute.
Sign in, add the OTA feed as a subscription, force a sync, and inspect imported events without waiting on partner dashboards.
Why teams switch
Behavior validation beats syntax-only checks.
A feed can be fetchable and structurally valid while still producing the wrong blocked nights, partial imports, or mismatched booking behavior downstream. iCal Tester helps you confirm what actually matters in production.
Inspect real imports
See whether the booking reached the consumer at all.
Validate final availability
Check blocked nights, overlaps, and drift across channels.
Escalate with evidence
Prove whether the issue is upstream, mapping-related, or downstream.
Who this is for
Role-specific outcomes, not generic calendar tooling.
PMS developers
Reduce support tickets by reproducing broken calendar sync behavior before changing production logic.
Channel managers
Prove whether blocked-night drift is coming from the source feed, import layer, or downstream mapping.
Property managers
Catch overbooking risks earlier by checking the final availability behavior across OTA exports.
Support teams
Escalate with evidence instead of screenshots by showing imports, logs, and timeline mismatches.
Comparison
Why syntax-only validation leaves teams guessing.
| Question | Syntax-only validator | iCal Tester |
|---|---|---|
| Can it prove the feed imports into the consumer? | No. It can only inspect the file structure. | Yes. Import the live feed and inspect the result directly. |
| Can it confirm final blocked-night behavior? | No. A valid file can still produce the wrong availability. | Yes. Compare imported events and timeline behavior. |
| Can support teams escalate with evidence? | Usually not beyond syntax output. | Yes. Use logs, imported data, and side-by-side comparisons. |
Guides
One hub plus focused long-tail guides.
Start with the validation hub, then move laterally through focused guides for blocked dates, OTA sync drift, validator checks, and overbooking prevention.
Validation Hub
Ultimate Guide to iCal RFC 5545 Validation for Property Management
Comprehensive hub for OTA and PMS teams: RFC-aware validation workflow, behavior checks, and linked cluster guides for sync troubleshooting.
Airbnb Guide
Airbnb iCal Not Syncing? How to Debug It
Debug Airbnb iCal sync by importing the live export, forcing a sync, and comparing blocked dates before stale availability causes an overbooking.
Booking.com Guide
How to Test Booking.com Calendar Sync
Test Booking.com calendar sync by importing the live feed, forcing the first sync, and comparing blocked nights across channels before they drift into production.
Validator Guide
RFC 5545 iCal Validator Workflow
Use an RFC 5545 iCal validator workflow that checks fetch, import, and blocked-night behavior instead of stopping at syntax-only linting.
PMS Guide
PMS Integration Best Practices for OTA iCal Sync
Practical patterns for OTA and PMS sync reliability: polling, mapping, observability, and behavior validation.
Overbooking Guide
Prevent Overbookings with iCal Validation Workflows
Reduce double-booking risk by validating how imported events translate into final blocked dates.
Prefer a directory view? Go from the hub to all guide pages, then narrow down by OTA workflow or failure pattern.
Open the full directoryFAQ
Questions teams ask before they start testing.
What does iCal Tester validate?
It validates whether a live feed can be fetched, imported, and translated into the booking behavior you actually expect downstream.
Who uses iCal Tester?
Property managers, channel managers, PMS developers, and support teams use it to debug OTA and PMS sync issues before they cause overbookings.
Do I need a credit card to start?
No. The product is free to start and designed to get teams into the first sync workflow quickly.
Ready to isolate the problem?
Go from live feed URL to blocked-night proof in one workflow.
Start free, run the first sync immediately, and compare the resulting availability before guests ever see the mistake.