Google Play Billing vs Professor ARPDAU

Google Play Billing lets developers sell digital products and content in Android apps through one-time purchases or subscriptions. It is for digital items; developers selling physical goods or services are directed to the Google Pay SDK. One-time products may be consumable for repeat purchases or non-consumable for a lasting benefit, and can grant permanent access or a particular non-renewable use. Subscriptions grant defined benefits for a set period and support base plans, offers, prepaid plans, and add-on entitlements. The Play Billing Library connects an Android app with Google Play Services to retrieve localized offerings and launch purchase flows. Google recommends a secure backend using the Play Developer API for purchase verification and subscription management. That API can check purchase status and modify or cancel recurring purchases. Cloud Pub/Sub delivers notifications about changes to Google Play-managed subscriptions. Purchases that are not acknowledged within three days are automatically refunded. Google says service fees vary by developer and transaction; its overview says 97% of developers distribute apps and use Google Play at no charge, and 99% of developers subject to a service fee are eligible for a fee of 15% or less through available programs. The listed plan is free.

Professor ARPDAU is a web service for product managers and teams working on free-to-play mobile games. Its analytics tools model retention, lifetime value, campaign break-even timing, daily active users and revenue. The retention calculator fits a regression curve from D1, D3, D7 and optional D30 observations; at least two observations are needed, while a 0% observation is excluded. The LTV predictor multiplies ARPDAU by the retention-curve total. A break-even analyzer uses CPI, observed LTV and retention metrics to estimate when cohort revenue exceeds acquisition cost. Another predictor models DAU from daily installs and retention scenarios, then estimates daily revenue with ARPDAU. Its geographical pricing tool can update in-app prices by country, with user-controlled targeting and adjustments, using Google Play Console access and Google’s API. Free modeling tools need no account.