About FCM toolbox
This public toolbox allows you to easily test and debug Google's Firebase Cloud Messaging service. - Send and receive FCM payloads - Manage registered devices - Self-hosting capabilities On the public toolbox versions, users share the same FCM and FRD instances, be responsible! The GitHub project is located at github.com/SimonMarquis/FCM-toolbox
All FCM toolbox APK versions
No versions available.
Frequently Asked Questions
Yes. Every FCM toolbox APK on APK.now is automatically scanned and the cryptographic signature is verified against the original publisher's certificate (Simon Marquis). Files that fail verification are removed before they ever reach the catalog.
Enable 'Install from unknown sources' for your browser (or the file manager you use to open the APK) under Settings → Apps → Special access. Tap the downloaded FCM toolbox APK, confirm the prompts, and Android installs it just like any app from the Play Store.
The latest FCM toolbox version available on APK.now is the latest version. We track new releases from Simon Marquis continuously and add them to the catalog as soon as they pass verification.
Yes — every FCM toolbox APK and every version on APK.now is free to download. We never gate downloads behind sign-up, surveys, or paywalls.
APK.now keeps a full archive of every FCM toolbox release, including older versions that the Play Store has already replaced. The APKs work on devices without Google Play Services (Huawei, GrapheneOS, Amazon Fire) and are signature-verified so you can be confident the file is genuine.