ESP32-C3-DevKitM-1 or ESP32-C6-DevKitC-1 — which one?
Both are Espressif entry boards; the difference is the radio generation (Wi-Fi 4 + BLE vs Wi-Fi 6 + BLE 5 + 802.15.4), the USB story (one bridge port vs two Type-C ports with different roles) and flash. A decision table with sources.
Question this page answers: "I'm choosing between the ESP32-C3-DevKitM-1 and the ESP32-C6-DevKitC-1 — which one fits my project?"
Both are official Espressif evaluation boards for RISC-V single-core chips, and both expose nearly all GPIOs on dual headers with an addressable RGB LED on GPIO8. The choice comes down to three published differences.
The decision table
| What you need | C3-DevKitM-1 | C6-DevKitC-1 | Source |
|---|---|---|---|
| Wi-Fi generation | 2.4 GHz Wi-Fi 802.11b/g/n + Bluetooth 5 (LE) | Wi-Fi 6 (802.11ax) in 2.4 GHz | module datasheets: C3-MINI-1 v2.2 §1.1; C6-WROOM-1 v1.4 |
| Extra radio | — | Bluetooth 5 + IEEE 802.15.4 (Zigbee 3.0, Thread 1.3) | C6 guide, component description |
| USB ports | one micro-USB (USB-to-UART bridge); native USB only on pins IO18/IO19 | two Type-C ports — the chip's USB Serial/JTAG controller (USB 2.0 full speed: flashing, console, JTAG) and a UART bridge | both guides; both chip datasheets (peripheral lists) |
| Flash (as assembled) | 4 MB in the on-board module's chip package; the chip itself takes optional package flash up to 8 MB (datasheet v2.5) | 8 MB module SPI flash (module sold in 4 MB and 8 MB versions, datasheet v1.4) | chip/module datasheets |
| Module on board | ESP32-C3-MINI-1 / -1U | ESP32-C6-WROOM-1 / -1U | both guides, component description |
| On-board LED | addressable RGB on GPIO8 | addressable RGB on GPIO8 (WS2812) | both guides |
| Strapping pins to respect | GPIO2, GPIO8, GPIO9 | GPIO4 (MTMS), GPIO5 (MTDI), GPIO8, GPIO9, GPIO15 | both guides, header footnotes |
How to decide
- Matter over Thread, native Thread/Zigbee, or Wi-Fi 6 → C6. Matter over Wi-Fi alone → either chip. Espressif's Matter documentation builds Matter Wi-Fi devices on Wi-Fi SoCs including the ESP32-C series, and the official Arduino-ESP32 feature table marks Matter (Wi-Fi) for both the C3 and the C6 — so a Wi-Fi-only Matter device does not force the C6. What only the C6 adds is the 802.15.4 radio: Matter over Thread, native Thread/Zigbee, and Wi-Fi 6; the same table marks Matter (Thread) for the C6 (and other 802.15.4 chips) but not for the C3.
- Simplest bring-up on a budget → C3. One USB port means one decision; the board is smaller (MINI-1 module) and 4 MB flash is plenty for most Wi-Fi/BLE firmware.
- USB-native workflows (USB CDC console, JTAG over the same cable) → C6. Only the C6 board wires the chip's USB Serial/JTAG controller to its own Type-C connector; on the C3 you would have to wire IO18/IO19 yourself.
- Both boards respect strapping pins — external hardware holding the wrong levels at reset changes boot behavior on either board; the pin lists differ (table above).
What this page cannot tell you
- Real-world range, power consumption or RF performance — datasheet and lab territory, not asserted here.
- Whether a third-party "C3 SuperMini" is right for you — those boards share the chip but have no official Espressif board documentation; this site's C3 board page explains why a bare "C3 SuperMini" search has no exact official-board match.
Boards
- ESP32-C3-DevKitM-1 — 30 contacts, ordering variants, the single USB port.
- ESP32-C6-DevKitC-1 — 32 contacts, v1.1/v1.2, the two USB ports and their roles.
Next: First flash and the USB ports on C3/C6.
Sources
- ESP32-C3-DevKitM-1 User Guide (esp-dev-kits commit 1b4c83bc) — components, header block, strapping footnote.
- ESP32-C6-DevKitC-1 v1.2 User Guide (esp-dev-kits commit 1b4c83bc) — components (radio generation, USB port roles), header block, strapping footnote.
- ESP32-C3-MINI-1/-1U Datasheet v2.2 §1.1 — "Small-sized 2.4 GHz Wi-Fi (802.11b/g/n) and Bluetooth 5 module".
- ESP32-C6-WROOM-1/-1U Datasheet v1.4 — "2.4 GHz Wi-Fi 6 (802.11ax), Bluetooth 5 (LE), Zigbee and Thread"; 4 MB / 8 MB versions.
- ESP32-C3 Series Datasheet v2.5 / ESP32-C6 Series Datasheet v1.6 — optional package flash up to 8 MB (C3); USB Serial/JTAG Controller in the peripheral list (both chips).
- Espressif's SDK for Matter — ESP32-C3 introduction — "The Wi-Fi-enabled SoCs and modules, such as ESP32, ESP32-C and ESP32-S series can be used to build Matter Wi-Fi devices"; 802.15.4 SoCs (incl. ESP32-C6) build Matter Thread devices.
- Arduino-ESP32 libraries feature table — Matter (Wi-Fi) marked for both C3 and C6; Matter (Thread) marked for C6 but not C3.