Best Arduino Alternatives in 2026: 7 Boards Compared

If you only try one board from this list, we would start here. Raspberry Pi's launch post lists the Pico 2 at $5 and describes the RP2350 chip as two Arm Cortex-M33 cores running at 150 MHz, with 520 KB of on-chip SRAM and 4 MB of flash on the board. The same chip can boot into RISC-V cores instead if you want to experiment.

The older Pico is still on sale as well. Raspberry Pi's Pico page lists it from $4 and the wireless Pico W at $6, both based on the RP2040 chip. Raspberry Pi's pages say the boards are programmed in C/C++ and MicroPython, and you can copy a file onto the board over USB like a flash drive. Adafruit's RP2040 listing notes that Arduino support exists through the Earle Philhower core, so you can keep using the Arduino IDE if you prefer.

The catch is the missing radio on the basic Pico 2. Raspberry Pi's page lists Wi-Fi and Bluetooth only on the Pico 2 W, and we could not confirm a price for that model on the pages we checked. If you need wireless on day one, look at the ESP32 below.

ESP32 is not one board but a family of chips from Espressif, and dozens of makers build boards around them. That is both its strength and its headache. On its dev kit page Espressif shows sample prices of $8 for the ESP32-C3-DevKitM-1, $9 for the ESP32-C6-DevKitC-1 and $15 for the ESP32-S3-DevKitC-1, and it labels these as reference prices only.

The chips are the reason people pick them. Espressif's page for the ESP32-S3 describes a dual-core Xtensa LX7 processor at 240 MHz, 2.4 GHz Wi-Fi, Bluetooth 5 (LE) and 45 programmable pins, plus vector instructions for small machine-learning jobs. Its C6 kit is listed with Wi-Fi 6 and Bluetooth LE. For a connected sensor, a smart plug or a small web server, this is the usual first choice.

The honest warning is about confusion. The classic ESP32-DevKitC page lists retailers such as DigiKey, Mouser and Amazon rather than a fixed price, and the exact chip, flash size and pin layout vary by kit. Read the chip name before you order, and check that your tutorial matches your board.

Teensy boards, made by PJRC, are what people reach for when an Arduino or a Pico runs out of speed. PJRC's page lists the Teensy 4.1 with a 600 MHz ARM Cortex-M7 processor, 8 MB of flash, 1024 KB of RAM, 55 digital pins and a hardware floating-point unit. It also has USB host and device ports, three CAN bus ports and an SD card socket, and the 10/100 Ethernet version is the standard 4.1 model.

The Arduino link is a real advantage. PJRC says the main way to program it is the Arduino IDE with the Teensyduino add-on, and it also lists PlatformIO and CircuitPython. That means most Arduino libraries and sketches work with few changes, only much faster.

Price is the catch. SparkFun lists the Teensy 4.1 at $31.50 with headers sold separately, and we did not find a price on PJRC's own product page, so check where you buy. For a blinking LED it is overkill, but for audio effects, LED walls or fast sensor loops it earns its cost.

Adafruit's Feather boards share one small size and pin layout, so you can mix boards and add-on "wings" without rewiring. The Feather RP2040 uses the same chip as the original Pico. Adafruit's listing shows $11.95 for one board, $10.76 each for 10 or more, and $9.56 each for 100 or more.

The listing describes a dual-core Arm Cortex-M0+ chip, 264 KB of SRAM and 8 MB of QSPI flash, with a USB-C connector and a 4-pin STEMMA QT port that lets you plug in I2C sensors with no soldering. Adafruit recommends CircuitPython as the easiest way to start and notes Arduino support through the Earle Philhower core. Headers come in the box but are not soldered on.

Adafruit also sells the SAMD21-based QT Py at $7.50, which Adafruit says shares the Seeed XIAO's size and pinout. The main downside of the Feather RP2040 is price: you pay extra over a Pico for the connectors and the polish. For a hobbyist who wants things to simply plug together, many people find that worthwhile. If you are buying a board only to learn on, the plain Pico is cheaper.

The XIAO line from Seeed Studio is about size. These boards are very small, which makes them suitable for wearables, small sensors and anything that must fit inside a tight case. Seeed's store lists the XIAO ESP32C3 at $4.90, described as using a RISC-V architecture and tagged for 2.4 GHz Wi-Fi and Bluetooth 5.0.

Seeed also sells XIAO boards on other chips, and the series page is titled around tiny Arduino-style boards for tinyML. Battery charging and low-power use are listed among the ESP32C3 version's tags, which fits a small portable build. Because Adafruit says its QT Py shares the XIAO size and pinout, accessories and cases often fit across the two brands.

The catch is that small means fewer pins and less room to solder, so it can be fiddly for beginners. The product page we read also gave few software details, so plan to read Seeed's wiki or a community guide before you start.

The micro:bit is the odd one out here. It is not a bare chip board but a small learning computer with a 5x5 LED display and a lot already on it. The official features page lists a light sensor, temperature sensor, compass, accelerometer, a built-in speaker, a microphone with an indicator light and a gold touch-sensitive logo, plus Bluetooth and radio to talk to other micro:bits.

Because everything is on the board, a child or beginner can build a step counter or a sound meter without wiring a single part. The micro:bit Educational Foundation sells through channel partners and resellers, including Adafruit, SparkFun, Micro Center and DigiKey in the US, and it lists the Go, Single, Club (10 boards) and Classroom (30 boards) packs. The site does not show prices, so check a reseller for the current figure.

It is a lesson tool more than a project board. If you outgrow block coding and want to power something permanent, a Pico or an ESP32 is the next step.

STMicroelectronics sells a wide line of Nucleo boards, each carrying a different STM32 chip. The company's page for the NUCLEO-F446RE says it has Arduino Uno V3 expansion connectors, ST morpho headers that expose all of the chip's pins, and an onboard ST-LINK programmer and debugger. In plain terms, you plug in a USB cable and you can both load code and step through it, with no extra hardware.

This is the board to pick if your goal is a job or a project that will later become a product, because STM32 chips are common in commercial devices. Its Arduino-style headers mean many Uno shields can be fitted, which softens the move.

The tradeoff is the learning curve. ST's own tools are aimed at engineers, and the first hour will feel harder than uploading a sketch. The product page we read did not display a price, and it differs by model and seller, so compare a few before buying.