Adafruit ItsyBitsy 32u4 3V 8MHz
Dev BoardUltra-compact 3.3V Arduino-compatible board with ATmega32u4 at 8MHz, native USB HID, 23 GPIO pins, 2KB RAM, 28KB flash, and Micro USB. Measures 35mm × 17mm — smaller than a Feather with equivalent AVR
Atmel ATmega32u4 AVR2 KB28 KB23 GPIO
~$10View
Adafruit ItsyBitsy 32u4 5V 16MHz
Dev BoardUltra-compact 5V Arduino-compatible board with ATmega32u4 at 16MHz, native USB HID, 23 GPIO pins, 2KB RAM, 28KB flash, and Micro USB. Measures 35mm × 18mm — small form factor with full Arduino Leonard
Atmel ATmega32u4 AVR2 KB28 KB23 GPIO
~$10View
Adafruit Pro Trinket 5V
Dev BoardCompact ATmega328P-based Arduino-compatible board at 16 MHz, 5V, with 28KB flash, 18 GPIO, Micro USB, FTDI header, and mounting holes — a miniaturized UNO with battery-friendly power management.
ATmega328P @ 16 MHz2 KB28 KB
~$10View
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More to explore — popular traits shared by devices with Flash: 28 KB.