ESP32 vs ESP8266: Which Board Should You Buy?

November 4, 2026

ESP32 WROOM Wi-Fi and Bluetooth development board

The ESP32 and ESP8266 are the two most popular low-cost Wi-Fi chips for IoT projects. Both program easily from the Arduino IDE, but they suit different jobs.

Short answer: buy an ESP32 for most new projects. Choose an ESP8266 when you only need simple Wi-Fi and want the smallest budget.

ESP32 vs ESP8266 comparison

Feature	ESP8266	ESP32 (classic)
CPU	Single core, 80 to 160 MHz	Dual core, up to 240 MHz
Wi-Fi	2.4 GHz	2.4 GHz
Bluetooth	No	Classic and BLE
GPIO	About 17	Up to 34
Analog inputs (ADC)	1 channel, 10-bit	Up to 18 channels, 12-bit
Touch pins	No	Yes
Logic level	3.3 V	3.3 V

The exact number of usable pins depends on the board, because some pins are reserved or not broken out.

When to choose the ESP8266

An ESP8266 board handles tasks such as sending a sensor reading to a dashboard, switching a relay over Wi-Fi or running a small web server. If your project needs one or two sensors and nothing more, it is a sensible choice.

NodeMCU V2.1 ESP8266 is a breadboard-friendly option for beginners.
Wemos D1 Mini suits compact builds.
ESP-01 is a tiny module for adding Wi-Fi to another microcontroller.

When to choose the ESP32

Pick an ESP32 when your project needs Bluetooth, several analog sensors, more pins or more processing power. The second core also helps when Wi-Fi and your own code need to run side by side.

ESP32 WROOM development board is a solid general-purpose choice.
ESP32-S3 DevKitC-1 N16R8 adds extra memory for displays and on-device AI experiments.
ESP32-C3 USB-C board is a small, single-core board for low-cost Wi-Fi and BLE projects.
AI Thinker ESP32-CAM adds a camera for image projects.

Things to check before you buy

Voltage: both chips use 3.3 V logic. Do not connect a 5 V signal directly to a GPIO pin.
USB chip: boards use chips such as CP2102 or CH340. You may need to install the matching driver.
Size and headers: confirm the pin count and whether headers are soldered, so the board fits your breadboard or shield.

Frequently asked questions

Is ESP32 code compatible with ESP8266?

Much of your Arduino code carries over, but some libraries and pin numbers differ. For example, Wi-Fi uses WiFi.h on ESP32 and ESP8266WiFi.h on ESP8266.

Which is better for a beginner?

Either works. If you are unsure, the ESP32 gives you more room to grow. If you have never used a microcontroller, you may prefer to start with an Arduino Uno R3.