Swiss army knife for identifying and fingerprinting Android devices. MIT license, no restrictions on usage in production. See link below to get the Pro version with 500K free monthly API calls.

Fingerprint Pro Wrapper for React Single Page Applications (SPA)

A best-effort compilation of all of Apple's device identifiers

A Dart package to generate fake Android device IDs, in the same format as Android's Settings.Secure.ANDROID_ID.

A robust plugin for Capacitor that provides a persistent Universal Device Identifier (UDID) across app reinstalls on iOS and Android.