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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.

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  1. yosys yosys Public

    Yosys Open SYnthesis Suite

    C++ 4k 977

  2. nextpnr nextpnr Public

    nextpnr portable FPGA place and route tool

    C++ 1.5k 267

  3. sby sby Public

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

    Python 464 82

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

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

    Shell 1.1k 97

Repositories

Showing 10 of 41 repositories
  • yosys Public

    Yosys Open SYnthesis Suite

    YosysHQ/yosys’s past year of commit activity
    C++ 3,991 ISC 977 487 119 Updated Aug 20, 2025
  • nextpnr Public

    nextpnr portable FPGA place and route tool

    YosysHQ/nextpnr’s past year of commit activity
    C++ 1,493 ISC 267 103 (1 issue needs help) 12 Updated Aug 20, 2025
  • 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 1,137 ISC 97 67 5 Updated Aug 20, 2025
  • prjpeppercorn Public

    Project Peppercorn - GateMate FPGA Bitstream Documentation

    YosysHQ/prjpeppercorn’s past year of commit activity
    Python 23 ISC 3 1 0 Updated Aug 19, 2025
  • riscv-formal Public

    RISC-V Formal Verification Framework

    YosysHQ/riscv-formal’s past year of commit activity
    Verilog 145 ISC 34 6 3 Updated Aug 19, 2025
  • prjpeppercorn-test-cases Public

    Project Peppercorn GateMate Test Cases

    YosysHQ/prjpeppercorn-test-cases’s past year of commit activity
    Verilog 9 ISC 6 0 0 Updated Aug 18, 2025
  • apicula Public

    Project Apicula 🐝: bitstream documentation for Gowin FPGAs

    YosysHQ/apicula’s past year of commit activity
    Verilog 583 MIT 77 15 2 Updated Aug 16, 2025
  • mcy Public

    Mutation Cover with Yosys (MCY)

    YosysHQ/mcy’s past year of commit activity
    C++ 86 ISC 14 2 1 Updated Aug 7, 2025
  • eqy Public

    Equivalence checking with Yosys

    YosysHQ/eqy’s past year of commit activity
    C++ 45 7 17 0 Updated Aug 7, 2025
  • sby Public

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

    YosysHQ/sby’s past year of commit activity
    Python 464 82 40 8 Updated Aug 7, 2025

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