Open-source, open-hardware
Firefly is a crypto-native device for Ethereum
Designed to be modified and customized
➜ see you IRL at DevConnect 2025
Built for Ethereum developers
Open Everything
Both hardware and firmware — all open source and ready to be customized
Run Custom Firmware
Modify Firefly to run your own logic — perfect for prototyping dapps or tools.
Human-readable Call Data
Use Firefly to securely execute Ethereum transactions or sign messages.
The Firefly Pixie DevKit
A compact hardware device for signing transactions, attestations, and games.
- 🧠 Open-source firmware
- 🛠️ Flashable via USB-C
- 🎮 Small, durable form factor
- 🔒 Built for secure signing
Getting Started
Connect your Firefly
Connect via USB-C and access your Firefly from your browser on firefly.box/flash.
Flash Your Firmware
Use the Firefly Flasher to select and install the latest Firefly firmware in seconds.
Start Signing
Sign transactions and messages, play games, build dapps, or launch your own Ethereum-native tools.
✨ Want your own Firefly?
We’re giving away Firefly DevKits to Ethereum developers — find us at Ethereum conferences.
Request a free Firefly DevKit