Push Notification Debugger

Push notifications failing? This macOS app helps you send, test, and debug APNs and Firebase Cloud Messaging notifications directly from your development setup. Inspect error responses, validate payloads, test device tokens, and diagnose delivery issues faster with support for APNs and FCM. The app supports APNs with P8 keys and P12 certificates, custom JSON payloads, and direct configuration of APNs HTTP/2 headers such as Push Type, Priority, Expiration, and Collapse ID. It also supports Firebase Cloud Messaging via the FCM HTTP v1 API, including modern authentication with Google service accounts and OAuth-based configurations. APNs and FCM error responses are presented clearly, helping you diagnose invalid payloads, expired credentials, bad device tokens, unregistered devices, topic issues, and other delivery failures faster. Built for iOS and macOS developers who need fast, reliable push notification debugging without third-party servers, relay services, or extra setup.