What is an introductory offer?

Apple's three types differ in when the customer pays. A free trial costs nothing for the offer period. Pay as you go charges a discounted price each billing period, for example $1.99 a month for three months on a $9.99 plan. Pay up front charges one discounted amount for the whole offer, for example $9.99 for the first six months of a $39.99 yearly plan. After the offer the subscription renews at the standard price. The allowed lengths depend on the subscription duration, and you can have one current and one future introductory offer per storefront. Once created, an introductory offer cannot be edited. You delete it and create a new one.

Eligibility is per subscription group, not per product. If a customer used a free trial and then moves to another product in the same group that also has a trial, they do not get a second one. Check eligibility before you show offer text in your app, because the App Store product page shows the offer only to people who qualify.

On Google Play an offer holds one or more phases. An introductory price phase must be the same as or lower than the base plan price. It can be one payment or from 1 to 52 recurrences of the billing period, and a free trial phase can come first. RevenueDot records each period's offer type: free_trial for a free offer and introductory for a paid one.

Sources: App Store Connect Help: Set up introductory offers · Apple: Auto-renewable subscriptions · Play Console Help: Understanding subscriptions