Handling simultaneous triggers from a single service in Applets

Documented behavior

IFTTT processes trigger events sequentially. When a connected service fires multiple trigger events in a short time window, each event is placed in the service’s internal queue and delivered to the Applet one after another. There is no automatic deduplication; every queued trigger will cause a separate execution of the Applet’s action unless the service itself imposes a cooldown or the Applet includes logic to ignore duplicate events.

Confirmed facts

• IFTTT’s execution model is single‑threaded per Applet: a new action cannot start while the previous action for that Applet is still running.
• Many services (e.g., RSS, Weather, Webhooks) enforce a minimum interval (often 1 minute) between successive trigger deliveries to prevent spamming.
• If a service does not enforce its own cooldown, overlapping triggers will result in multiple action runs, visible in the Applet’s activity log.
• IFTTT provides no built‑in deduplication trigger; you must add filtering logic inside the Applet (Filter code or a conditional action) to suppress unwanted duplicates.

Steps to manage overlapping triggers

1. Identify the service’s native trigger frequency limits (check the service’s IFTTT page or documentation).
2. If the service allows rapid repeats, add a Filter code block that compares the incoming trigger’s timestamp or payload to the most recent processed value and skips the action when the difference is below your desired threshold.
3. Alternatively, use the “Delay” action to space out actions, or employ a “Only send if changed” condition if the service supports it.
4. After saving the Applet, trigger the service twice in quick succession and verify in the Activity log that only the intended number of actions ran.

What to verify

Open the Applet’s Activity page, fire two trigger events from the same service within a few seconds, and check whether each event generated a separate action run. If you see multiple runs and want only one, the missing diagnostic detail is the service’s specific trigger interval or any existing cooldown it already applies.