Wokwi

Overview

Wokwi is a microcontroller simulator with firmware debugging for embedded projects. It is a strong fit for makers and developers who want to work across several boards and languages before moving to hardware, though its paid plans meter fast-build capacity.

Key features

Wokwi supports Arduino Uno, Nano and Mega, ATtiny85, the ESP32 family, STM32C031, STM32L031, STM32F103C8 and Raspberry Pi Pico. It simulates AVR, ESP32, STM32 and RP2040 targets, and lets users export firmware for Raspberry Pi Pico. That range gives projects room to move between common microcontroller families without changing simulators; the trade-off is that simulation is not the same workflow as developing directly against physical hardware.

Language support includes Arduino (C/C++), MicroPython, CircuitPython and Rust. Protocol coverage spans WiFi, HTTP, HTTPS, WebSocket, MQTT, NTP, CoAP, DNS, TCP and UDP, plus UART, I2C and SPI. This makes Wokwi useful for both connected IoT prototypes and projects centered on communication between components, rather than only basic board-level experiments.

Pricing

Community costs €0.00 per free, billed monthly. It includes unlimited simulations, unlimited public projects and Virtual WiFi, making it a capable starting point for personal exploration or projects that can remain public. The public-project condition matters if a project needs to stay private.

Hobby costs €5.60 per month with annual billing and includes 100 monthly fast build minutes. Hobby+ costs €8.10 per month with annual billing and raises that allowance to 500 minutes. These tiers suit users who need faster builds but should compare the quota with their expected monthly iteration: the allowance is finite, unlike Community's unlimited simulations.

Wokwi Pro costs €20.00 per month with annual billing and includes 1,000 monthly fast build minutes plus 2,000 monthly CI minutes. It is the clearest fit for teams or workflows that need automated builds, but the plan's value depends on using both monthly allowances. The plan terms provided do not state seat counts or a trial duration.

Platforms

Wokwi supports Linux, macOS, Windows and the web. That breadth makes it accessible across major desktop systems as well as through a browser, without limiting the listed platform choice to a single operating system.

Who it's for

Choose Wokwi for embedded learners, makers and developers who want to simulate and debug firmware across AVR, ESP32, STM32 and RP2040 targets, especially when a project uses its supported languages or network and serial protocols. It is less suitable as the sole choice for a hardware-first workflow, or when private projects are required on the free plan.

Pros and cons

• Pros: Unlimited free simulations and public projects make it possible to explore without a simulation-count cap.
• Pros: Four supported languages and a broad mix of network and device protocols cover varied embedded projects.
• Pros: Firmware debugging and Raspberry Pi Pico export extend its usefulness beyond simple simulation.
• Cons: Fast-build capacity is capped monthly on paid plans, so frequent iteration may require choosing a higher tier.
• Cons: Community projects are public, which rules out that plan for work that must remain private.
• Cons: Simulation cannot replace development directly against physical hardware for workflows that depend on the device itself.

Alternatives

IoT Development Tools is a broader category to browse when you want to compare options beyond Wokwi.

• Arm Keil MDK is worth considering for its Keil Studio, Keil μVision and Cortex-M device support.
• PlatformIO IDE is a free alternative with Linux, macOS, Windows and self-hosted platform support.
• Arduino IDE is a free, open-source option if Arduino IDE 2's autocompletion, code navigation and live debugging are a closer fit.
• e² studio is free with no paid version, though separate compiler packages are not included and may carry their own licensing or evaluation terms.
• ESP-IDF Extension for VS Code is a free VS Code extension for ESP-IDF.
• MPLAB X IDE is free and supports most Microchip microcontrollers and digital signal controllers.
• Renesas Flexible Software Package is free of charge on any Renesas device.
• STM32CubeIDE is a free-to-download proprietary ST application if that tool is the better match for your workflow.

Verdict

Wokwi is a strong choice for anyone who wants to simulate and debug embedded firmware across several popular microcontroller families, languages and protocols. Its unlimited free simulations lower the barrier to experimentation; look elsewhere if private projects on a free tier or development directly on physical hardware are essential.