That's a pretty impressive number. I believe it runs at 48 MHz. Not many methods of reaching such a low power level for computing. Even in the iCE40 FPGAs it might be hard to match that depending on the exact task.
There's a $15 Sparkfun board (not shipping yet but they are accepting preorders):
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- 40x40 mm board, Ambiq Apollo3 Blue cpu, 6 uA/MHz supposedly - 48 mhz cpu with 96 mhz burst mode, whatever that means - 1MB of on-chip flash and 384K of ram, very large for an MCU - on-chip special processor for bluetooth, antenna also on board - 2 MEMS microphones and 3D accelerometer on board - Camera connector - CR2032 coin cell holder on the back of the board - Only 4 gpio pads on the board, but maybe some of those sensor inputs to the cpu could be repurposed.
I've got a board on order. It will be interesting to code up a few simple apps to see how it rates with other low power devices. First I'll have to port Forth to it.
Rick C.