SF Balancer is a free planner for Satisfactory 1.0 and later. Lay out your factory as recipe blocks on a map, like in Satisfactory Modeler, and see the real belt flow between them: what is short, what is left over, and the mergers, splitters and load balancers each connection needs. It runs in your browser, with no sign-up.
It is free and open source (MIT). There is no account: your factories are saved in your browser, and the Share link carries the factory in the address itself.
Yes. "Import from Modeler" reads the .sfmd file right in your browser (nothing is uploaded) and adds it as a new factory. Splurgers and storage containers become direct connections, an empty container becomes an input, and the rates are recalculated from the game recipes, with clock speeds and node purity.
A port turns red only when nothing upstream can give more: a miner, extractor or input at its limit. If a block runs below its fixed machine count because one input is short, only that input is flagged, not the others.
Like in the game: a splitter divides evenly among the outputs that accept items and a merger alternates between its inputs. That is why the planner tells you when a connection needs a load balancer, and why an Awesome Sink, container or export only takes what is left over.
Yes. Biomass Burners, coal, fuel and nuclear generators burn their fuel (with water and waste where the game has them), and the balance bar shows the MW made, the MW your machines and extractors use (with the game's overclock curve) and the net. Miners are not counted yet.
Satisfactory 1.0 and later (recipe data from 1.1), with belts from Mk1 (60/min) to Mk6 (1,200/min) and pipes Mk1 (300 m³/min) and Mk2 (600 m³/min).