ESP32 vs Raspberry Pi Pico W: Which Should You Buy?

Both the ESP32 and the Raspberry Pi Pico W cost less than a sandwich, both have Wi-Fi and Bluetooth, and both will happily blink an LED and post a sensor reading to the internet. So which one belongs in your next project? Short answer: the ESP32 is the better default for connected gadgets, and the Pico W wins when you want clean documentation, MicroPython that just works, or the unusual timing tricks of PIO. Here is the longer answer.

The short version

If you want a side-by-side of every spec, the ESP32 vs Pico W comparison page has it. This article is about the stuff the spec sheet does not tell you.

Connectivity

On paper the Wi-Fi is the same generation: single-band 2.4 GHz 802.11n. In practice the ESP32 radio is more mature. It has been in the field since 2016, and the Espressif stack handles reconnects, power-save modes, SoftAP, mesh and ESP-NOW. The Pico W stack is good for the usual jobs (connect, serve a page, call an API) but has fewer advanced features and is less forgiving of a weak signal.

Bluetooth is where the ESP32 pulls ahead for hobbyists. You get classic Bluetooth (handy for audio and serial profiles) plus BLE. The Pico W radio supports BLE well through the Pico SDK and MicroPython, but classic Bluetooth support is limited. If you want to pair with a phone and stream audio, pick the ESP32. If BLE sensors are enough, either works.

CPU, PIO and the ADC

The ESP32 is simply faster: 240 MHz with a hardware FPU against 133 MHz with none. For anything with floating-point maths (filters, orientation fusion, audio) the gap is large. The Pico makes up for it with PIO, programmable I/O state machines that generate precise protocols with no CPU load. WS2812 LEDs, VGA, custom serial, quadrature decoders and logic-analyser tricks are all easier on a Pico. ESP32 has RMT and I2S, which cover a lot of the same ground but with more configuration.

ADC quality is the Pico's weak spot and the ESP32's too, in a different way. The RP2040 ADC has only three external channels (GPIO26 to GPIO28) and its noise gets worse when the onboard switching supply is in power-save mode. The classic ESP32 ADC covers more channels but is nonlinear near the ends of its range, so you calibrate it or live with errors of a few percent. For real measurement, add an external ADS1115 over I2C, and a voltage divider to bring higher voltages into range.

GPIO, power and price

The Pico W exposes 26 usable GPIO, all of them freely assignable thanks to flexible muxing. A typical ESP32 DevKit exposes around 25 usable pins, but with a pile of restrictions: some are input-only and some are strapping pins (see ESP32 pins you should not use). Check the ESP32 pinout and the Pico pinout before you design a PCB or wire a breadboard.

On power, neither board is a coin-cell champion. The Pico W has a very simple sleep story: its dormant mode saves power on the chip, but board-level draw stays far above the best ESP32 deep sleep figures, and it has no real-time clock. A well-chosen ESP32 board can sleep at tens of microamps. If you run on batteries, read Best Microcontroller for Battery-Powered Projects, and plug your numbers into the battery life calculator.

Software and documentation

• ESP32: Arduino core, ESP-IDF, MicroPython, CircuitPython (on supported chips), PlatformIO. The ecosystem is huge, so most libraries just work.
• Pico W: C/C++ SDK, MicroPython (the official, polished one), CircuitPython, and an Arduino core. Raspberry Pi documentation is excellent and beginner friendly.
• Tutorials: both have thousands. ESP32 has more IoT projects, Pico has more learning material for beginners.

Pitfalls to know before you buy

• ESP32 ADC2 vs Wi-Fi. On the classic ESP32, ADC2 pins cannot be read while Wi-Fi is active. Use ADC1 pins (GPIO32 to GPIO39).
• ESP32 strapping pins. GPIO0, 2, 5, 12 and 15 affect boot. A sensor pulling GPIO12 high can stop the chip starting.
• Pico W ADC noise. Keep the switching supply out of power-save (drive the pin that controls it high), average several readings, and use ADC_VREF with a clean reference if accuracy matters.
• Pico W has only 3 ADC channels and no hardware floating point, so heavy maths is slower than you may expect.
• Pico W sleep is not very low. Do not expect years on a small battery without extra hardware.
• Both are 3.3 V logic. Connecting 5 V signals directly can damage them. Level shift or divide down.

Decision table

Our recommendation

Buy an ESP32 if the project talks to the internet, runs on a battery, or needs Bluetooth. The ESP32-C3 is a great modern pick: cheap, low power, and RISC-V. The ESP32-S3 is the choice when you need more power or USB.

Buy a Pico W if you are learning, you love tidy documentation, or your project depends on PIO. If you want a faster upgrade with more RAM and a hardware FPU, look at the Pico 2 W. When you can, buy two boards and learn both: at this price it costs less than one bad evening of debugging. Planning a wiring job? The printable Pro Pinout Pack puts every pin on one sheet.