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November 11, 2026

Velxio

Education & ResearchScientific Computing and Simulation15
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Free, open-source online circuit and microcontroller simulator that runs real firmware and SPICE simulations in your browser.

Circuit SimulationPhysics SimulationMicrocontroller Simulation
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Product facts

Type
Web App / SaaS
Category
Education & Research › Scientific Computing and Simulation
Pricing
Freemium
Launched
Nov 11, 2026
Listed
Nov 11, 2026
Website
velxio.dev

Overview

DiscordGitHubX

Velxio is a free, open-source online circuit and microcontroller simulator that runs entirely in the web browser with no cloud computing required. It combines real-time SPICE simulation powered by ngspice-WASM with multi-architecture CPU emulation on a single canvas for building circuits, writing firmware, and debugging.

Core Capabilities

  • Multi-Architecture Support: Covers 6 CPU architectures (AVR8, ARM Cortex-M, ARM Cortex-A, RISC-V, Xtensa, Linux) and 35 development boards including Arduino Uno/Mega/ATtiny85, ESP32 series, RP2040/RP2350, STM32, and Raspberry Pi.
  • SPICE Simulation: Uses ngspice compiled to WebAssembly for nodal analysis. GPIO pins drive real nets, ADCs read solved node voltages, and probes can report RMS, DC, and current values.
  • Digital Logic: Simulates pure gate-level circuits such as adders, comparators, decoders, and flip-flops.
  • Custom Chips: Build custom chips using C, Rust, or AssemblyScript via the Wokwi Custom Chips API and compile them to WASM.
  • Development Toolchain: Includes Monaco Editor, Serial Monitor, arduino-cli compilation, Library Manager, plus an oscilloscope, voltmeter, ammeter, signal generator, and over 100 interactive electronic components.
  • Partner Hardware: Simulates real hardware from manufacturers like DFRobot, M5Stack, Seeed Studio, and Pimoroni.

Who It's For

Designed for electronics hobbyists, embedded developers, and educational institutions. Schools can provision Pro accounts for students under a single institutional contract, starting at $34 per student per year (minimum 5 students). Individual users can choose Free, No AI, or Maker plans to unlock STM32, Raspberry Pi Linux boards, custom WiFi networks, and AI-assisted features as needed.

Key features

  • Multi-Architecture Board Emulation: Run 35 boards across 6 architectures—including AVR8, ARM, RISC-V, and Xtensa—directly in your browser.
  • Real-Time SPICE Simulation: Node analysis powered by ngspice-WASM solves analog circuits roughly 60 times per second.
  • Digital Logic Simulation: Simulate gate-level circuits like adders and flip-flops without a microcontroller.
  • Custom Chips: Build custom chips in C, Rust, or AssemblyScript using the Wokwi Custom Chips API.
  • Built-In Instruments: Includes an oscilloscope, voltmeter, ammeter, and signal generator.
  • Monaco Editor: Built-in code editor for writing firmware.
  • arduino-cli Compilation: Compile firmware in the browser using arduino-cli.
  • Library Manager: Manage Arduino libraries, with 100 MB of storage on the free plan.
  • Serial Monitor: View serial output directly.
  • Runs Locally: All simulations run in your local browser—no cloud required.
  • AI-Assisted Modes: Paid plans offer Agent and Tutor modes where AI helps build circuits or teach concepts.
  • CI Integration: Paid plans include 200 CI minutes per month, supporting velxio-cli and GitHub Action.

Releases

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Initial · Velxio

Q&A

Is Velxio free?AI-generated
The core simulator is free forever, including 30+ development boards and basic AI chat. STM32, Raspberry Pi Linux boards, custom WiFi networks, and advanced AI features require a paid subscription.
Which boards and architectures are supported?AI-generated
It supports 35 development boards across 6 CPU architectures (AVR8, ARM Cortex-M, ARM Cortex-A, RISC-V, Xtensa, Linux), including Arduino, ESP32 series, RP2040/RP2350, STM32, and Raspberry Pi.
Do simulations run in the cloud?AI-generated
No. All simulations run locally in your browser—no cloud required.
How do I build custom chips?AI-generated
Use the Wokwi Custom Chips API to write custom chips in C, Rust, or AssemblyScript, compile them to WASM, and use them on the canvas.
How can schools use Velxio?AI-generated
Educational institutions can sign a single contract to provision Pro accounts for an entire class without individual billing. With education discounts, pricing starts at $34 per student per year, with a minimum of 5 students.
How does SPICE simulation work?AI-generated
ngspice is compiled to WebAssembly and performs full nodal analysis about 60 times per second. GPIO pins drive real nets, and ADC inputs read the solved node voltages.
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