browser based so no install. i use it for US residential wood calcs, NDS beams/columns (sawn lvl glulam), joist spans, ASCE 7-22 wind and seismic, SDPWS shear walls with Simpson holdowns. output actually shows the formula with your numbers plugged in w code refs. plan check liked the verify link on the pdf they open online and walk through calcs. free tier for clcultion get me started. For printing the calculation package we need to subscribe.