Apphud is a subscription management and in-app purchase (IAP) infrastructure platform for iOS, Android, and web apps. It ships a cross-platform SDK that handles purchase validation and subscription state sync, paired with real-time revenue analytics (MTR, proceeds, cohort LTV), A/B paywall experiments, and rules-based engagement automations. Mobile teams use it to replace custom IAP backends and get actionable subscription metrics without building analytics infrastructure from scratch.