A $15 board with a touchscreen that can deauth WiFi clients and capture WPA handshakes. The HaleHound CYD sounds too good to be true. After two weeks with one on my bench, I can tell you it's both more capable and more limited than the hype suggests.
I kept seeing this thing pop up everywhere. Reddit threads, YouTube walkthroughs, Discord channels full of custom firmware builds. The pitch is dead simple: why spend $60+ on a Raspberry Pi Zero W build for a Pwnagotchi when you can get a functional WiFi pentesting tool for the price of a burrito? I ordered one to find out.
What Is the HaleHound CYD, Really?
First, let's kill a misconception. The HaleHound CYD isn't a boxed product with a barcode and a warranty card. It's a community project built around the "Cheap Yellow Display" board, a generic ESP32 development board with a 2.8-inch ILI9341 touchscreen you can grab on AliExpress or Amazon for roughly $10-15. "HaleHound" refers to the firmware that turns this cheap dev board into a WiFi security testing tool.
The hardware underneath is an ESP32 microcontroller from Espressif Systems. Dual-core chip, built-in 2.4 GHz WiFi and Bluetooth. Same silicon powering countless IoT projects, smart home gadgets, and yes, WiFi deauthers. The CYD board packages it with a touchscreen, micro-USB port, and SD card slot in a form factor roughly the size of a credit card.
Here's the thing nobody's saying about the HaleHound CYD: it's not a single tool. It's a platform. The firmware ecosystem includes deauthentication attacks, beacon flooding, probe request sniffing, and handshake capture. Different builds emphasize different capabilities. Some are forks of Stefan Kremser's (Spacehuhn) ESP32 deauther project, others are custom community builds that go in completely different directions.
I've shipped enough security tooling to know that the real question isn't "what can this do on paper" but "what actually works when you're standing in a hallway trying to capture a handshake."
How WiFi Deauthentication Attacks Actually Work
Before judging the HaleHound CYD's capabilities, you need to understand the core attack it enables. A WiFi deauthentication attack exploits a design flaw in the 802.11 protocol. Management frames, including deauthentication frames, are sent unencrypted and unauthenticated in WPA2. Any device on the same frequency can forge a deauth frame telling a client to disconnect from its access point.
As Palo Alto Networks' Cyberpedia explains, this is a denial-of-service attack targeting the communication between a user and a WiFi access point. But the real value for pentesters isn't the DoS itself. It's what happens after: when the disconnected device automatically reconnects, it performs a fresh WPA handshake. If you're listening with the right tool, you capture that handshake and crack it offline.
I've used this exact attack vector in authorized penetration tests with professional tools like the WiFi Pineapple. The question is whether a $15 ESP32 board can pull it off reliably enough to be useful.
Short answer: yes, with significant caveats.
HaleHound CYD vs Pwnagotchi: Two Very Different Tools
The comparison that keeps coming up is HaleHound CYD vs Pwnagotchi, and honestly, it's misleading. These tools solve different problems.
The Pwnagotchi, created by security researcher evilsocket, runs on a Raspberry Pi Zero W and uses an A2C-based reinforcement learning model to optimize handshake capture. It learns from its environment over time, getting better at choosing targets and timing attacks. Full Linux stack, bettercap for network manipulation, captured handshakes in PCAP format ready for hashcat.
The HaleHound CYD does none of that. No AI, no Linux, no bettercap. Firmware flashed directly to the ESP32's bare metal. What it offers instead is immediate, tactile interaction through its touchscreen: scan for networks, select a target, launch a deauth, monitor results. It's a dedicated WiFi remote control, not an autonomous hacking companion.
| Feature | HaleHound CYD | Pwnagotchi |
|---|---|---|
| Cost | ~$15 | $50-80+ (Pi Zero W + e-ink + battery) |
| AI/ML Learning | No | Yes (A2C reinforcement learning) |
| Operating System | Bare-metal firmware | Raspberry Pi OS (Linux) |
| Display | 2.8" color touchscreen | e-ink display |
| WiFi Bands | 2.4 GHz only | 2.4 GHz only (without external adapter) |
| Handshake Capture | Basic (firmware-dependent) | Advanced (bettercap + PCAP) |
| Setup Difficulty | Moderate (firmware flashing) | Higher (Linux configuration) |
| Portability | Excellent (tiny, low power) | Good (needs battery pack) |
| Extensibility | Limited | High (full Linux ecosystem) |
Having worked with both, here's my take: the Pwnagotchi is a serious tool for someone who wants to learn WiFi security deeply. The HaleHound CYD is a gateway drug. I mean that as a genuine compliment. Not everyone needs reinforcement learning when they're still wrapping their head around how deauth frames work.
[YOUTUBE:25et7KJzb1s|New Halehound CYD Firmware: Complete Walkthrough]
Setting Up the HaleHound CYD: What to Actually Expect
If you've ever flashed firmware onto an Arduino or ESP board, you'll feel at home. If you haven't, the learning curve is steeper than the Reddit posts suggest.
Unlike a Pwnagotchi where you write an SD card image and configure a config.toml file, the CYD requires flashing compiled firmware directly to the ESP32 over USB. Download the firmware binary, install esptool.py or use a web-based flasher, connect via micro-USB, flash. Four steps on paper. In practice, I spent 20 minutes fighting a USB driver issue before remembering I needed the CP2102 driver, then another 10 minutes because I picked the wrong COM port.
Total time for me: about 45 minutes, and I've been flashing microcontrollers for years. A friend who's a solid backend engineer but has zero hardware experience took closer to two hours. Almost all of that was USB driver hell on Windows. If you're on Linux, this goes smoother. If you want to build some comfort with bootable USB workflows first, I wrote about how to reset a Windows machine with a Linux USB which covers similar territory.
Once flashed, the touchscreen interface is surprisingly responsive. Tap to scan, select networks from a list, choose your attack type, go. The UI varies by firmware version, but the better builds are genuinely polished for a community project.
The WPA3 Problem Nobody Wants to Talk About
This is where I get blunt: the HaleHound CYD has a shelf life. So does the Pwnagotchi. And that shelf life is shrinking fast.
WPA3 replaces the Pre-Shared Key (PSK) exchange with Simultaneous Authentication of Equals (SAE). As tech journalist Chris Hoffman at How-To Geek has explained, SAE is resistant to offline dictionary attacks. That matters because offline cracking is the entire attack chain these tools enable. You capture a handshake, crack it with hashcat or aircrack-ng. WPA3 makes that captured handshake essentially useless for password cracking.
The deauth attack itself still works against WPA3 in most implementations. You can still kick devices off the network. But the valuable follow-up, capturing and cracking the reconnection handshake, is dead. WPA3 adoption is accelerating. Every new router shipped in 2025 and 2026 supports it, and most default to it.
This doesn't make the CYD useless today. Plenty of networks still run WPA2. I did a quick scan of my neighborhood and found over 60% still on WPA2. But if you're buying this tool primarily to learn handshake capture, understand that the window is closing.
The real lasting value is in learning how 802.11 works at a protocol level. Understanding management frames, building intuition about wireless security. Those concepts transfer regardless of which WPA version the world runs on.
This is one of those things where the boring answer is actually the right one: the best reason to buy a $15 security tool is education, not exploitation.
Is the HaleHound CYD Worth $15?
Absolutely. But only with the right expectations.
If you're expecting a pocket-sized device that will crack your neighbor's WiFi, you'll be disappointed and potentially breaking the law. If you want a cheap, hands-on way to learn WiFi protocols, deauthentication mechanics, and wireless security fundamentals, this is one of the best $15 you can spend.
I've been building and reviewing security hardware for over a decade, and the trend is obvious: the barrier to entry for security research keeps collapsing. A few years ago, you needed a $200 Alfa adapter and a laptop running Kali to do what this $15 board does through a touchscreen. More people with access to these tools means more people learning, which means better collective defense. It's the same principle behind why I think AI pentesting agents are reshaping offensive security.
The CYD won't replace a professional pentest toolkit. It won't match a Pwnagotchi's sophistication. It won't crack WPA3. But it will teach you more about WiFi security in a weekend than any textbook. And when you outgrow it, you've spent fifteen dollars, not a hundred and fifty.
The best security tools aren't the most expensive ones. They're the ones that make you curious enough to understand what's actually happening on the wire.
If the Raspberry Pi price hikes taught us anything, it's that the hardware hacking community will always find a cheaper path. The HaleHound CYD is proof. The next generation of security researchers isn't starting with enterprise tools. They're starting with a $15 board and a YouTube tutorial. And that's exactly how it should work.
Originally published on kunalganglani.com
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