Choosing the Right ESP32 SuperMini – C3, S3, C6, H2 Compared

Why SuperMini Boards Are Taking Over #

ESP32 SuperMini boards have exploded in popularity - and it's easy to see why: Their ultra-compact size (just 22.5 x 18 mm) makes them perfect for wearables, embedded builds, and anywhere space is tight. But it’s not just about the footprint.

Until recently, many makers were cautious about SuperMini boards due to unreliable batches - USB issues, unstable boot modes, or flaky power rails were common with some no-name versions. That’s changed. Reputable vendors are now consistently delivering well-built SuperMinis, and suddenly these boards are becoming the go-to picks for many makers.

With five versions available - C3, C3 Plus, S3, C6, and H2 - each with different cores and wireless stacks, the real question is, which one fits your project?

That’s exactly what this guide is for.

Quick Comparison #

Size Comparison #

While all ESP32 Super Mini boards aim for ultra-compactness, their physical sizes aren’t exactly identical. The ESP32-C3 SuperMini set the baseline at 22.52 x 18 mm, but:

• The ESP32-S3 SuperMini and ESP32-H2 SuperMini are slightly longer - 1 extra pin row, making them a bit taller while maintaining compatibility.
• The ESP32-C6 SuperMini stretches that even further with 2 extra rows of pins compared to the C3, offering more GPIOs but increasing the height slightly.

CPU and Architecture #

Now onto what’s inside those boards.

• RISC-V: Found in the C3, C6, and H2 variants. These single-core chips prioritize power efficiency and a streamlined toolchain, ideal for low-power or compact projects.
• Xtensa: The S3 SuperMini features a dual-core Xtensa LX7 CPU running at up to 240 MHz - much more capable for performance-heavy tasks like real-time image processing or multitasking peripherals.

If you’re curious about how these cores differ more broadly, we break it all down in this ESP32 architecture comparison.

Wireless Capabilities #

Wi-Fi #

Bluetooth #

Zigbee / Thread (IEEE 802.15.4) #

Battery Support #

Onboard LED #

Each SuperMini variant includes an onboard LED for status indication, but the type and capabilities vary significantly. Some boards feature basic single-color LEDs for simple status feedback, while others include programmable RGB LEDs that allow full color control for more sophisticated visual feedback in your projects.

Common Features #

All SuperMini boards share:

• Compact design optimized for space
• Standard interfaces: UART, I2C, SPI
• Consistent pinouts (core functions mapped similarly)
• Reset & Boot buttons for manual flashing

Complete Specifications #

Use Case Scenarios #

Quick Decision Guide #

C3 vs C3 Plus: What's Different? #

Both the ESP32-C3 SuperMini and the C3 SuperMini Plus are built around the same chip - the ESP32-C3 RISC-V core with 4MB of flash, 400 KB SRAM, and support for Wi-Fi 4 and Bluetooth 5 (LE). They also share the same pinout and overall form factor, even though the plus sometimes might be a little bit longer.

First, the antenna: the original C3 SuperMini uses a small onboard PCB antenna. It works well for most general-use projects, but if you need stronger or more stable signal - especially in noisy environments or over longer distances - the C3 Plus offers a U.FL connector so you can add an external antenna.

Second, the LED: the C3 SuperMini includes a basic blue status LED on GPIO8. It’s great for simple feedback like boot status or blinking heartbeat. The Plus version, however, upgrades this with an onboard RGB LED, giving you full color control - ideal for projects that need richer visual feedback without adding extra hardware.

Choose C3 for minimal design. Choose C3 Plus for RGB visuals or better wireless range.

3D-Printed Enclosures #

Protect your SuperMini with custom 3D-printed cases designed for a perfect fit.

Conclusion #

Choosing the right ESP32 SuperMini comes down to understanding your project's priorities. Each variant brings something unique to the table, whether it's the H2's ultra-low power consumption for battery-powered mesh networks, the S3's dual-core processing power for demanding applications, or the C6's cutting-edge Wi-Fi 6 and multi-protocol support for smart home hubs.

The beauty of the SuperMini lineup is that there's no wrong choice - just different tools for different jobs. And with prices hovering around $3-6, you can afford to experiment with multiple boards to find your perfect match.

Explore Detailed Board Pages #

📖 Deep dives with pinouts, specifications, and project ideas: