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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++ 4.7k 1.2k

  2. nextpnr nextpnr Public

    nextpnr portable FPGA place and route tool

    C++ 1.8k 345

  3. sby sby Public

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

    Python 545 103

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

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

    Shell 1.7k 135

Repositories

Showing 10 of 45 repositories
  • yosys Public

    Yosys Open SYnthesis Suite

    YosysHQ/yosys's past year of commit activity
    C++ 4,745 ISC 1,156 450 96 Updated Sep 10, 2026
  • property-ir Public
    YosysHQ/property-ir's past year of commit activity
    Python 9 1 0 0 Updated Sep 10, 2026
  • nextpnr Public

    nextpnr portable FPGA place and route tool

    YosysHQ/nextpnr's past year of commit activity
    C++ 1,751 ISC 345 123 (1 issue needs help) 25 Updated Sep 10, 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 1,697 ISC 135 50 4 Updated Sep 10, 2026
  • apicula Public

    Project Apicula 🐝: bitstream documentation for Gowin FPGAs

    YosysHQ/apicula's past year of commit activity
    Python 687 MIT 101 29 2 Updated Sep 9, 2026
  • abc Public Forked from berkeley-abc/abc

    ABC: System for Sequential Logic Synthesis and Formal Verification

    YosysHQ/abc's past year of commit activity
    C 35 794 0 1 Updated Sep 9, 2026
  • mcy Public

    Mutation Cover with Yosys (MCY)

    YosysHQ/mcy's past year of commit activity
    C++ 99 ISC 19 1 1 Updated Sep 9, 2026
  • eqy Public

    Equivalence checking with Yosys

    YosysHQ/eqy's past year of commit activity
    Python 62 14 21 0 Updated Sep 9, 2026
  • sby Public

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

    YosysHQ/sby's past year of commit activity
    Python 545 103 45 11 Updated Sep 9, 2026
  • picorv32 Public archive

    PicoRV32 - A Size-Optimized RISC-V CPU

    YosysHQ/picorv32's past year of commit activity
    Verilog 4,384 ISC 1,001 68 18 Updated Sep 7, 2026

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