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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 351

  3. sby sby Public

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

    Python 548 105

  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 136

Repositories

Showing 10 of 45 repositories
  • yosys Public

    Yosys Open SYnthesis Suite

    YosysHQ/yosys's past year of commit activity
    C++ 4,766 ISC 1,167 451 96 Updated Sep 22, 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 1,722 ISC 136 47 4 Updated Sep 22, 2026
  • nextpnr Public

    nextpnr portable FPGA place and route tool

    YosysHQ/nextpnr's past year of commit activity
    C++ 1,755 ISC 351 125 (1 issue needs help) 19 Updated Sep 21, 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 35 841 0 1 Updated Sep 21, 2026
  • icestorm Public

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

    YosysHQ/icestorm's past year of commit activity
    Python 1,187 ISC 243 49 20 Updated Sep 21, 2026
  • apicula Public

    Project Apicula 🐝: bitstream documentation for Gowin FPGAs

    YosysHQ/apicula's past year of commit activity
    Python 689 MIT 102 30 1 Updated Sep 20, 2026
  • prjtrellis Public

    Documenting the Lattice ECP5 bit-stream format.

    YosysHQ/prjtrellis's past year of commit activity
    Python 470 103 37 16 Updated Sep 20, 2026
  • sby Public

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

    YosysHQ/sby's past year of commit activity
    Python 548 105 45 12 Updated Sep 19, 2026
  • property-ir Public
    YosysHQ/property-ir's past year of commit activity
    Python 10 1 0 0 Updated Sep 18, 2026
  • eqy Public

    Equivalence checking with Yosys

    YosysHQ/eqy's past year of commit activity
    Python 64 15 21 0 Updated Sep 16, 2026

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