They seem to be making their own eFPGA architecture, so there's no vendor tool to compare against for their primary purpose. The closest you'll get is xc7 (Xil

They seem to be making their own eFPGA architecture, so there's no vendor tool to compare against for their primary purpose. The closest you'll get is xc7 (Xilinx) vs vendor, one of which is surely Xilinx 7. But the Yosys xc7 support is limited and not the best supported, so it's not a great comparison either.