How to Choose a Seeed XIAO ESP32 Board: C3, C6, or C5
Pick the C3 for WiFi sensor nodes, the C6 for Matter, Thread, and Zigbee builds, and the C5 for dual-band Wi-Fi 6 with more memory. All three share the thumb-sized XIAO form factor at 21 mm wide. The C3 runs at 160MHz, the C6 adds Wi-Fi 6 and 802.15.4, and the C5 runs at 240MHz with 8MB of PSRAM.
Quick facts
| Fact | Value |
|---|---|
| Form factor | XIAO, 21 mm wide, all three boards |
| C3 | $12.38, 160MHz, WiFi, BLE 5.0 |
| C6 | $14.88, Wi-Fi 6, 802.15.4, Matter |
| C5 | $16.24, 240MHz, dual-band Wi-Fi 6 |
| Deep sleep | 44uA on C3, 15uA on C6 |
| Packs | 1-pack, 2-pack, and 3-pack listings |
What do all three boards share?
All three use the thumb-sized XIAO form factor at 21 mm wide, with LiPo battery charging on board.
All three run Arduino code, and the C3 and C6 listings also name MicroPython and ESP-IDF.
Deep sleep current is 44uA on the C3 and 15uA on the C6, which matters for battery-powered sensor nodes.
When does the C3 fit?
The C3 runs a 160MHz RISC-V single core with 400KB of SRAM, 2.4GHz WiFi, and BLE 5.0.
An external U.FL antenna connects through the onboard connector, and the board measures 21 by 17.5 mm.
The listing names sensors, smart home nodes, wearables, and battery-powered builds as the use cases.
When does the C6 fit?
The C6 adds 2.4GHz Wi-Fi 6, Bluetooth 5 LE, and IEEE 802.15.4 for Thread and Zigbee, with Matter support built in.
Two RISC-V cores run at 160MHz and 20MHz, with an onboard antenna plus a U.FL connector for an external antenna.
Deep sleep drops to 15uA, and secure boot with a trusted execution environment protects the firmware.
When does the C5 fit?
The C5 runs at up to 240MHz with 8MB of PSRAM and 8MB of Flash, the largest memory of the three boards.
Dual-band Wi-Fi 6 covers 2.4GHz and 5GHz, the first XIAO board with 5GHz, plus Bluetooth 5 LE, Zigbee, and Thread.
Up to 11 GPIO and PWM pins and 5 ADC channels connect sensors, with I2C, SPI, and dual UART on board.
Which pack size should you buy?
Single boards suit a first build, while 2-packs and 3-packs suit multi-node projects and spares on the bench.
The C5 3-pack costs $34.99, which is less per board than three single boards at $16.24 each.
The C3 3-pack and C6 3-pack follow the same pattern, with one board per node in a sensor network.
What did we check on the bench?
We checked each listing states its clock speed, radios, memory, and board size.
We matched every price here to the live store price on November 12, 2026.
We counted 1 image on each XIAO listing in this guide.
How the options compare
| Board | Clock | Radios | Antenna | Price |
|---|---|---|---|---|
| XIAO ESP32C3 | 160MHz | WiFi, BLE 5.0 | U.FL external | $12.38 |
| XIAO ESP32C6 | 160 + 20MHz | Wi-Fi 6, 802.15.4 | Onboard + U.FL | $14.88 |
| XIAO ESP32-C5 | 240MHz | Dual-band Wi-Fi 6, 802.15.4 | External included | $16.24 |
How do you pick the right XIAO board?
- List the radios the project needs: WiFi only, or Matter, Thread, and Zigbee too.
- Pick the C6 or C5 when the project needs 802.15.4, and the C3 when WiFi and BLE cover it.
- Check the memory need: the C5 holds 8MB of PSRAM and 8MB of Flash.
- Pick a pack size for the number of nodes, with one spare board for the bench.
- Check the antenna plan: onboard antenna, U.FL external antenna, or both.
Parts that fit this guide
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Seeed Studio XIAO ESP32C3 Development Board, 1-Pack ($12.38)
XIAO ESP32C3 board, 1-pack, at $12.38. 160MHz RISC-V, 400KB SRAM, WiFi and BLE 5.0, external U.FL antenna.
Seeed Studio XIAO ESP32C6 Development Board, 1-Pack ($14.88)
XIAO ESP32C6 board, 1-pack, at $14.88. Wi-Fi 6, Bluetooth 5 LE, Thread and Zigbee, Matter, dual RISC-V, 15uA deep sleep.
Seeed Studio XIAO ESP32-C5 Development Board, 1-Pack ($16.24)
XIAO ESP32-C5 board, 1-pack, at $16.24. 240MHz, dual-band Wi-Fi 6, 8MB PSRAM, 8MB Flash, 11 GPIO and PWM pins.
Seeed Studio XIAO ESP32-C5 Development Board, 3-Pack ($34.99)
XIAO ESP32-C5 board, 3-pack, at $34.99. Three boards with dual-band Wi-Fi 6 for multi-node Matter and Thread builds.
Related parts: Seeed Studio XIAO ESP32C3 Development Board, 3-Pack: XIAO ESP32C3 board, 3-pack, for three sensor nodes; Seeed Studio XIAO ESP32C6 Development Board, 3-Pack: XIAO ESP32C6 board, 3-pack, for Matter and Zigbee networks; Seeed Studio XIAO ESP32-C5 Development Board, 2-Pack: XIAO ESP32-C5 board, 2-pack, for a two-node build with a spare.
Shop the full range: ESP32 and ESP8266 at Quality RC Parts. See also: Related guide.
Frequently asked questions
Does the C5 work on 5GHz WiFi?
Yes. The C5 listing states 2.4 and 5GHz dual-band Wi-Fi 6, and calls it the first XIAO board with 5GHz.
Which boards run Matter, Thread, and Zigbee?
The C6 and C5 listings both name Matter, Thread, and Zigbee through IEEE 802.15.4. The C3 listing names WiFi and BLE 5.0 only.
Do the boards include an antenna?
The C6 has an onboard antenna plus a U.FL connector. The C3 uses an external U.FL antenna, and the C5 includes an external RF antenna.
Can I develop with Arduino?
Yes. All three listings name Arduino support. The C3 listing also names MicroPython, CircuitPython, PlatformIO, ESP-IDF, and Zephyr.
Sources
- Seeed XIAO ESP32C3 getting started
- Seeed XIAO ESP32C6 getting started
- Seeed XIAO ESP32-C5 getting started
Last updated: November 12, 2026.