iOS services, including Reminders, Photos, and Calendar, require you to have the IFTTT app installed in order to function. This is because IFTTT doesn't interact with these services via the cloud, it all takes place on your device instead.
Users that have the IFTTT app installed on multiple iOS devices, such as an iPhone and an iPad, may find iOS reminders posting multiple times. To fix this, on just one of your devices, visit the Settings app, scroll down to IFTTT, and disable Reminders access.
