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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++ 4.3k 1k

  2. nextpnr nextpnr Public

    nextpnr portable FPGA place and route tool

    C++ 1.6k 286

  3. sby sby Public

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

    Python 491 89

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

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

    Shell 1.4k 110

Repositories

Showing 10 of 42 repositories
  • nextpnr Public

    nextpnr portable FPGA place and route tool

    YosysHQ/nextpnr’s past year of commit activity
    C++ 1,619 ISC 286 114 (1 issue needs help) 16 Updated Feb 24, 2026
  • yosys Public

    Yosys Open SYnthesis Suite

    YosysHQ/yosys’s past year of commit activity
    C++ 4,294 ISC 1,037 491 92 Updated Feb 24, 2026
  • apicula Public

    Project Apicula 🐝: bitstream documentation for Gowin FPGAs

    YosysHQ/apicula’s past year of commit activity
    Verilog 639 MIT 84 22 4 Updated Feb 24, 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 1,359 ISC 110 79 7 Updated Feb 24, 2026
  • sby Public

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

    YosysHQ/sby’s past year of commit activity
    Python 491 89 43 8 Updated Feb 23, 2026
  • eqy Public

    Equivalence checking with Yosys

    YosysHQ/eqy’s past year of commit activity
    C++ 58 10 21 0 Updated Feb 23, 2026
  • test-actions Public
    YosysHQ/test-actions’s past year of commit activity
    C++ 0 ISC 0 0 1 Updated Feb 20, 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 32 733 0 3 Updated Feb 11, 2026
  • prjpeppercorn Public

    Project Peppercorn - GateMate FPGA Bitstream Documentation

    YosysHQ/prjpeppercorn’s past year of commit activity
    Python 33 ISC 3 0 2 Updated Feb 11, 2026
  • prjpeppercorn-test-cases Public

    Project Peppercorn GateMate Test Cases

    YosysHQ/prjpeppercorn-test-cases’s past year of commit activity
    Verilog 13 ISC 7 0 0 Updated Feb 10, 2026

Most used topics

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