ESP32 vs ESP32-S3 vs ESP32-C6: which chip for your project

"ESP32" is no longer one chip. It is a family that spans two different CPU architectures and a decade of radio standards. Picking the right member saves you money, power and weeks of surprises. This guide compares the three you are most likely to choose between in 2026: the original ESP32, the ESP32-S3 and the ESP32-C6.

01One family, three jobs

The original ESP32, launched in 2016, is the workhorse. Dual Xtensa LX6 cores, 2.4 GHz Wi-Fi and Bluetooth (Classic plus LE). It is cheap, proven and documented to death. Most tutorials and shields still assume it.

The ESP32-S3 is the "do more" chip. It keeps the dual-core Xtensa design but moves to LX7 cores with extra vector instructions aimed at small machine-learning and signal-processing workloads. Crucially it adds a native USB controller and supports larger PSRAM, which is why it has become the default for camera, audio and AI projects.

The ESP32-C6 is the "connect to everything" chip. It drops Xtensa for an open RISC-V core and brings the radios forward: Wi-Fi 6, Bluetooth 5 LE, and an 802.15.4 radio for Thread and Zigbee. That 802.15.4 support is what lets it join Matter-over-Thread smart-home networks that the older chips cannot.

02Side by side

The shared features are easy to forget in the noise: all three run 2.4 GHz Wi-Fi and Bluetooth LE, all three are programmed with the same tools, and all three are inexpensive. The table below shows where they part ways.

03Cores and performance

The original ESP32 and the S3 both use two Xtensa cores and clock up to 240 MHz, so for ordinary code they feel similar. The difference shows up in two places:

• Vector instructions on the S3. The LX7 cores add SIMD-style instructions that Espressif's libraries use to accelerate small neural networks, FFTs and image processing. For a wake-word detector or a camera pipeline, the S3 is meaningfully faster than the classic ESP32.
• RISC-V on the C6. The C6 uses a single 160 MHz RISC-V core plus a tiny low-power core that can keep sensors running while the main core sleeps. It is not aimed at heavy compute; it is aimed at low-power, always-connected nodes.

If raw dual-core throughput matters, the ESP32 or S3 are your choices. If staying connected on microamps between events matters more, the C6's low-power core is the interesting part.

04USB and radios

Two practical differences change how a board feels to use.

Native USB. The classic ESP32 has no USB hardware of its own, so boards add an external USB-to-serial chip (a CP2102 or CH340) just to flash and print to the serial monitor. The S3 and C6 both include a USB controller on the die. On the S3 it is full USB-OTG, so the board can present itself as a keyboard, a mass-storage drive or a custom USB device. On the C6 it is a USB Serial/JTAG unit, which handles programming and debugging without an extra chip. Either way you get one fewer component and, on the S3, real USB device roles.

Radios. This is the headline reason to reach for a C6. On top of Wi-Fi and Bluetooth LE it carries an 802.15.4 radio, the same physical layer used by Thread and Zigbee. That means a single C6 can be a Matter device over Thread, talk to Zigbee sensors, and still fall back to Wi-Fi. The ESP32 and S3 cannot do 802.15.4 at all. The C6 is also the first of the three with Wi-Fi 6, which brings better behaviour on busy networks rather than raw speed on this class of device.

05When each one wins

1. Pick the original ESP32 when you want the cheapest, most documented option, you are following an existing tutorial or shield, and you do not need native USB or Thread. It still does Wi-Fi and BLE perfectly well.
2. Pick the ESP32-S3 when you want native USB for a cleaner board or custom USB roles, you are doing camera, audio or on-device AI, or you simply want the strongest general-purpose chip of the three. This is the safe default for new designs.
3. Pick the ESP32-C6 when you need Thread, Zigbee or Matter, you want Wi-Fi 6, or you are building a battery node that must stay connected on very little power. Its low-power core and 802.15.4 radio are the draw.

A quick way to decide: if the words "Matter", "Thread" or "Zigbee" appear in your spec, go C6. If "camera", "audio", "AI" or "USB device" appear, go S3. If none do and cost rules, the classic ESP32 is fine.

06Moving code between them

Good news: all three share Espressif's ESP-IDF and the Arduino-ESP32 core, so most high-level code moves across with a recompile. A short sketch that connects to Wi-Fi and prints a sensor value runs on all three unchanged.

#include <WiFi.h>

void setup() {
  Serial.begin(115200);
  // Same API on ESP32, ESP32-S3 and ESP32-C6
  WiFi.begin("your-ssid", "your-password");
  while (WiFi.status() != WL_CONNECTED) {
    delay(300);
    Serial.print(".");
  }
  Serial.printf("\nIP: %s\n", WiFi.localIP().toString().c_str());
  Serial.printf("Chip: %s\n", ESP.getChipModel());  // prints the family
}

void loop() {}

What does not port automatically:

• Pin numbers. GPIO maps differ between the families, so anything that hard-codes a pin needs a check.
• Peripherals the classic chip lacks. Code that uses native USB or 802.15.4 only builds for the chips that have them.
• Low-level assembly. If you wrote Xtensa-specific assembly or used LX7 vector intrinsics, that will not run on the C6's RISC-V core.

07FAQ

SGP Lab — written by the team that designs and builds SGP hardware in Europe. We test every example on our own boards before publishing.