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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++ 4.1k 991

  2. nextpnr nextpnr Public

    nextpnr portable FPGA place and route tool

    C++ 1.5k 272

  3. sby sby Public

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

    Python 474 82

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

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

    Shell 1.2k 102

Repositories

Showing 10 of 41 repositories
  • riscv-formal Public

    RISC-V Formal Verification Framework

    YosysHQ/riscv-formal’s past year of commit activity
    Verilog 150 ISC 35 7 5 Updated Oct 4, 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 1,180 ISC 102 69 6 Updated Oct 4, 2025
  • yosys Public

    Yosys Open SYnthesis Suite

    YosysHQ/yosys’s past year of commit activity
    C++ 4,056 ISC 991 481 98 Updated Oct 4, 2025
  • prjpeppercorn Public

    Project Peppercorn - GateMate FPGA Bitstream Documentation

    YosysHQ/prjpeppercorn’s past year of commit activity
    Python 26 ISC 3 0 0 Updated Oct 3, 2025
  • sby Public

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

    YosysHQ/sby’s past year of commit activity
    Python 474 82 41 9 Updated Oct 2, 2025
  • nextpnr Public

    nextpnr portable FPGA place and route tool

    YosysHQ/nextpnr’s past year of commit activity
    C++ 1,530 ISC 271 105 (1 issue needs help) 12 Updated Oct 2, 2025
  • apicula Public

    Project Apicula 🐝: bitstream documentation for Gowin FPGAs

    YosysHQ/apicula’s past year of commit activity
    Verilog 589 MIT 77 16 2 Updated Oct 2, 2025
  • prjpeppercorn-test-cases Public

    Project Peppercorn GateMate Test Cases

    YosysHQ/prjpeppercorn-test-cases’s past year of commit activity
    Verilog 10 ISC 6 0 0 Updated Sep 25, 2025
  • eqy Public

    Equivalence checking with Yosys

    YosysHQ/eqy’s past year of commit activity
    C++ 46 8 18 0 Updated Sep 22, 2025
  • icestorm Public

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

    YosysHQ/icestorm’s past year of commit activity
    Python 1,096 ISC 234 46 20 Updated Sep 22, 2025

Most used topics

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