Hacky-Fi Is a USB Multi-Tool for Your Keychain
Turn your keychain into a multi-tool with Hacky-Fi, an ultra-compact RP2350-based USB dongle for automation and hardware hacking on the go.
Whether you’re deep in a penetration test, reverse-engineering IoT hardware, or tinkering with a DIY build, your success heavily depends on having the right gear at hand. The Flipper Zero proved that multi-tools can be portable, but even the greatest device is useless if it’s sitting on your desk when you are away. If you forget to pack it, you’re stuck on the sidelines the moment a project — or a vulnerability — presents itself.
Hacky-Fi was designed to ensure that you are never caught without a USB hacking tool when you need it most. This device takes the form of an ultra-compact USB-C dongle — small enough to live on a keychain yet capable of acting as a powerful programmable hardware interface. It is built around the Raspberry Pi RP2350A microcontroller, paired with a 0.85-inch LCD display, two programmable buttons, an RGB status LED, 2MB of onboard flash, and a microSD slot for expandable storage.
The device enumerates as a USB Human Interface Device (HID), allowing it to simulate keyboard input, launch scripts, or automate repetitive workflows across Windows, Linux, Android, and macOS once plugged in. Users can store multiple scripts on the SD card and switch profiles without reflashing firmware.
The onboard screen can display menus, payload names, icons, or status messages, while the RGB LED signals modes and success states. That visual confirmation addresses a long-standing limitation of past USB automation tools, which often leave users guessing whether a payload executed correctly.
Hacky-Fi supports MicroPython and CircuitPython for quick scripting and education, alongside C/C++ for lower-level control. That means the same device can serve as a classroom teaching aid for USB HID concepts, a portable macro pad for creators, or a rapid-prototyping platform for embedded developers.
Example use cases include one-click automation, browser workflows, media controls, and controlled cursor simulations. The developers also position Hacky-Fi as a research and training tool for authorized security demonstrations.
As embedded computing continues to shrink, powerful tools are being freed from bulky development boards. Instead, they’re becoming everyday carry items — small enough to forget in your pocket, but capable enough to matter when you need them. If you'd like to snag a Hacky-Fi for yourself, they are being offered up on Kickstarter with rewards starting at about $61.
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