| Category | Winner | Why |
|---|---|---|
| Wireless Protocols | ESP32-C6-DevKitC-1 | The C6 has WiFi 6 (802.11ax), BLE 5.3, Thread, Zigbee 3.0, and Matter — five protocols on one chip. The C3 has WiFi 4 (802.11n) and BLE 5.0 only. For any project that might touch smart home mesh networking, the C6 is the only viable option. |
| Deep Sleep Power | ESP32-C3-DevKitM-1 | The C3 draws 5uA in deep sleep versus the C6's 7uA. That 2uA difference adds up in coin-cell or small-battery deployments where the device sleeps 99% of the time. For a door sensor on a CR2032, the C3 can last months longer. |
| Memory and Storage | ESP32-C6-DevKitC-1 | The C6 ships with 8MB flash and 512KB SRAM versus the C3's 4MB flash and 400KB SRAM. The extra flash matters when running both WiFi and Thread stacks simultaneously, and the 28% more SRAM helps with Matter's memory-intensive protocol stack. |
| GPIO and Peripherals | ESP32-C6-DevKitC-1 | The C6 breaks out 30 GPIO pins versus the C3's 22. It also has a dedicated low-power RISC-V co-processor at 20MHz that can monitor sensors and GPIOs while the main core sleeps — a feature the C3 lacks entirely. |
| WiFi Efficiency | ESP32-C6-DevKitC-1 | WiFi 6 (802.11ax) on the C6 includes Target Wake Time (TWT), which lets the access point schedule when the device wakes to transmit. This dramatically reduces WiFi power consumption for periodic reporting. The C3's WiFi 4 has no equivalent power scheduling. |
| Price | ESP32-C3-DevKitM-1 | The C3 DevKitM costs approximately $8 versus $9 for the C6 DevKitC. At single-unit quantities the $1 difference is negligible, but at production volumes of 10,000+ units it adds up to meaningful BOM savings when the extra protocols are not needed. |
Data from PAM Finds