KiCad Autorouting in 2026: Every Option That Actually Works

The KiCad project removed its legacy autorouter years ago and has kept the position since: the built-in tools are for interactive and assisted manual routing, and automation is left to external programs. That is a defensible engineering stance, hand-routed boards are usually cleaner, but for dense digital boards, quick prototypes, and revision churn, an autorouter saves real hours, which is why the question keeps coming up on every KiCad forum.

FreeRouting is the long-standing free answer: export a Specctra DSN from KiCad, run the Java application, let it route, then import the SES session file back. It works, it is genuinely free, and it remains the default recommendation in most forum threads. The cost is the workflow itself: a Java runtime, a three-file round trip per iteration, and manual cleanup when the import disagrees with your board setup.

ProtoFlow skips the export dance because it reads and writes KiCad formats natively: open the .kicad_pcb, run the built-in ProtoRoute autorouter, inspect the result with DRC, and save straight back, the same file KiCad reopens afterward. Routing runs locally on your machine, and the same editor covers interactive routing, ratsnest inspection, and Gerber export if you want to finish there instead.

It is free on Mac and Windows, which makes it the lowest-friction answer for the common case: "I have a KiCad board, route it, give it back."

Quilter applies physics-driven AI to place and route boards in the cloud, and DeepPCB routes uploaded designs as a pay-as-you-go service. Both can produce strong results on suitable boards and both operate outside your machine: you upload the design, wait for the run, and bring the result back. Evaluate them when routing quality on dense boards matters more than iteration speed or keeping files local.

Want the fastest local loop with no format juggling: ProtoFlow. Want the established open-source tool and do not mind the DSN round trip: FreeRouting. Want to stay strictly inside stock KiCad: a community routing plugin. Want a cloud service to attempt the whole board: Quilter or DeepPCB. Whichever routes the board, run DRC in KiCad afterward and review the result like any other automated output.