ESP8266 vs ESP32 vs ESP32-S2

Product details
	ESP8266	ESP32	ESP32-S2

Website	https://www.espressif.com/en/products/socs/esp8266	https://www.espressif.com/en/products/socs/esp32	https://www.espressif.com/en/products/socs/esp32-s2
Release date	2014	2016	2019
CPU	Tensilica LX106 32 bit @ 80 MHz (up to 160 MHz)	Tensilica Xtensa LX6 32 bit Dual-Core @ 160 / 240Mhz	Tensilica Xtensa LX7 32 bit Single-Core @ 240Mhz
Coprocessor		ULP	ULP (RISC-V)
RAM	160 KB (36 KB available to user)	520 KB	320 KB
ROM		448 KB	128 KB
UART	2	3	2
SPI	Yes 2	Yes 4	Yes 4 (OSPI)
Wi-Fi	Yes 802.11b/g/n (max 65Mbps)	Yes 802.11b/g/n	Yes 802.11b/g/n
Bluetooth®	No	Yes 4.2 BR/EDR + BLE	No
USB Host	No	No	Yes
Ethernet (LAN, RJ45)	No	Yes 10/100Mbps	No
RTC Memory		16 KB	16 KB
External SPIRAM	16 MB up to	16 MB up to	128 MB up to
External Flash			1 G up to
ESP-MESH	Yes	Yes	Yes
CAN		2.0
GPIO	17 (up to)	32 (up to)	43
Hall effect sensor	No	Yes	No
Temperature sensor	No	Yes	Yes
Capteurs tactiles	No	10	14
I²C	Yes up to 1	Yes up to 2	Yes up to 2
I2S	2	2	1
ADC	Yes 10 bit	Yes 12 bit SAR ADC up to 18 channels	Yes 12 bit SAR ADC up to 20 channels
DAC	No	Yes 8 bit up to 2 channels	Yes 8 bit up to 2 channels
PWM	No	Yes up to 8	Yes 8
SDMMC	No	Yes	No
RMT (remote control)	No	Yes	Yes
LCD Interface	No	No	Yes
Camera Interface	No	No	Yes
Secure flash		1024-bit OTP secure boot	4096-bit OTP secure boot
Cryptography support		AES, SHA-2, RSA, ECC, RNG	AES-128/192/256, SHA-2, RSA, RNG, HMAC, Digital Signature
Deep sleep consumption	20 µA	10 µA	5 µA
Dimensions
Height	5 mm	6 mm
Width	5 mm	6 mm

More comparisons