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@YosysHQ

Yosys Headquarters

Yosys Open SYnthesis Suite

YosysHQ - Open Source EDA

OSS CAD Suite: the one-stop shop for our tools

If you want to use our EDA tools, the easiest way is to install the binary release OSS CAD suite, which contains all required dependencies and related tools. Find the documentation here. We also have an OSS CAD Suite github action for using the tools in a github CI workflow.

Tabby CAD Suite is a commercial extension of OSS CAD Suite available from YosysHQ GmbH that additionally includes the Verific frontend for industry-grade SystemVerilog and VHDL support, formal verification with SVA, and formal apps.

Our Projects

Front-ends for applications built on top of Yosys:

  • sby: formal property checking
  • mcy: mutation coverage
  • eqy: equivalence checking

Other notable projects:

  • riscv-formal: formally check compliance with the RISC-V specification
  • picorv32: A Size-Optimized RISC-V CPU
  • nerv: A very simple educational RISC-V CPU for demonstrating riscv-formal

Community

Support us

Like what we do? Please consider either buying a license for the Tabby CAD Suite or becoming a sponsor.

Pinned Loading

  1. yosys yosys Public

    Yosys Open SYnthesis Suite

    C++ 4.8k 1.2k

  2. nextpnr nextpnr Public

    nextpnr portable FPGA place and route tool

    C++ 1.8k 378

  3. sby sby Public

    SymbiYosys (sby) -- Front-end for Yosys-based formal verification flows

    Python 559 108

  4. oss-cad-suite-build oss-cad-suite-build Public

    Multi-platform nightly builds of open source digital design and verification tools

    Shell 1.8k 141

Repositories

Showing 10 of 45 repositories
  • apicula Public

    Project Apicula 🐝: bitstream documentation for Gowin FPGAs

    YosysHQ/apicula's past year of commit activity
    Python 700 MIT 109 35 4 Updated Oct 20, 2026
  • yosys Public

    Yosys Open SYnthesis Suite

    YosysHQ/yosys's past year of commit activity
    C++ 4,823 ISC 1,181 482 100 Updated Oct 20, 2026
  • nextpnr Public

    nextpnr portable FPGA place and route tool

    YosysHQ/nextpnr's past year of commit activity
    C++ 1,777 ISC 377 128 (1 issue needs help) 23 Updated Oct 20, 2026
  • eqy Public

    Equivalence checking with Yosys

    YosysHQ/eqy's past year of commit activity
    Python 66 15 22 0 Updated Oct 20, 2026
  • oss-cad-suite-build Public

    Multi-platform nightly builds of open source digital design and verification tools

    YosysHQ/oss-cad-suite-build's past year of commit activity
    Shell 1,772 ISC 141 49 5 Updated Oct 20, 2026
  • property-ir Public
    YosysHQ/property-ir's past year of commit activity
    Python 12 1 0 0 Updated Oct 20, 2026
  • prjpeppercorn Public

    Project Peppercorn - GateMate FPGA Bitstream Documentation

    YosysHQ/prjpeppercorn's past year of commit activity
    Python 47 ISC 7 1 1 Updated Oct 19, 2026
  • icestorm Public

    Project IceStorm - Lattice iCE40 FPGAs Bitstream Documentation (Reverse Engineered)

    YosysHQ/icestorm's past year of commit activity
    Python 1,193 ISC 244 50 20 Updated Oct 18, 2026
  • sby Public

    SymbiYosys (sby) -- Front-end for Yosys-based formal verification flows

    YosysHQ/sby's past year of commit activity
    Python 559 108 46 11 Updated Oct 14, 2026
  • mcy Public

    Mutation Cover with Yosys (MCY)

    YosysHQ/mcy's past year of commit activity
    C++ 101 ISC 20 1 1 Updated Oct 13, 2026

Most used topics

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