Link	Espressif ESP32	Espressif ESP8266	Ameba RTL8195	Ameba RTL8710
Release date	2016	2014	Jul. 1st 2016	Aug. 1st 2016
Product details
RAM	520 KB	50 KB less than		48 KB available to user
CPU	Tensilica Xtensa LX6 32 bit Dual-Core @ 160 / 240Mhz	Tensilica LX106 32 bit @ 80 MHz (up to 160 MHz)	ARM Cortex M3 32 bit @ 166 MHz	ARM Cortex M3 32 bit @ 83 MHz
Flash	up to 64 MBytes	1, 2, 4, 8 or 16 MB		1MB Built-in
Input Voltage	2.2 V - 3.6 V	3.0 V - 3.6 V	3.0 V - 3.6 V	3.0 V - 3.6 V
Operating Current	80 mA average	80 mA average	80 mA average	80 mA average
Temperature Range	-40°C to 125°C	-40°C to 125°C	-40°C to +125°C	-40°C to +125°C
Standards	FCC/CE/TELEC/KCC	FCC/CE/TELEC/SRRC	FCC/CE/TELEC/SRRC	FCC/CE/TELEC/SRRC
Connectivity
Wi-Fi	Yes 802.11b/g/n	Yes 802.11b/g/n (max 65Mbps)	Yes 802.11b/g/n	Yes 802.11b/g/n
Bluetooth®	Yes 4.2 BR/EDR + BLE	No	No	No
UART	3	2	3x UART	2x UART
I/O
I²C	Yes up to 2	Yes up to 1	Yes up to 4	Yes up to 1
GPIO	34	17 (up to)	30 (up to)	17 (up to)
PCM	Yes up to 1	No	Yes up to 2	No
PWM	Yes up to 8	Yes 4	Yes up to 4	Yes up to 4
ADC	Yes 12 bit SAR ADC up to 18 channels	Yes 10 bit	Yes 2 channels	No
DAC	Yes 8 bit up to 2 channels	No	Yes 1 channel	No
Dimensions
Package	QFN-48	QFN-32	QFN-48	QFN-48
Height	6 mm	5 mm	6 mm	6 mm
Width	6 mm	5 mm	6 mm	6 mm
Links
Website	espressif.com/...	espressif.com/...	amebaiot.com/en/	amebaiot.com/en/
Wikipedia	wikipedia.org/...	wikipedia.org/...
See on Amazon	amazon.com/...	amazon.com/...	amazon.com/...