4 layers

Pocket s
ridhinva/pocket-s
Toolkit: Pocket-S: Open-source ESP32-S3 multi-tool alternative to Flipper Zero — Sub-1GHz, NFC, RFID, IR, BLE, WiFi with modular expansion in C
32 parts1MIT
KiCad boards from 1 GitHub repository tagged “bug-bounty”, the most starred first; open any of them in PCBKit.

ridhinva/pocket-s
Toolkit: Pocket-S: Open-source ESP32-S3 multi-tool alternative to Flipper Zero — Sub-1GHz, NFC, RFID, IR, BLE, WiFi with modular expansion in C