Altium vs KiCad: an honest comparison for professional PCB design

Altium Designer and KiCad sit at opposite ends of the EDA market: one is a premium commercial suite, the other a free, open-source project that has quietly become a serious professional tool. If you're deciding between them — or defending a choice to switch — here's an honest comparison, without the tribalism.

Short answer: For the vast majority of boards, modern KiCad does professional-grade work — including stackup, controlled impedance, and length matching, on up to 32 copper layers. Altium's clearest remaining edges are supply-chain intelligence (ActiveBOM), high-speed constraint management (xSignals), signal- and power-integrity simulation, HDI, and Altium 365 data management. For most teams the real difference isn't the editor — it's the workflow around it.

Cost: the obvious difference#

Altium Designer is a commercial subscription, typically a few thousand US dollars per seat per year. KiCad is free under the GNU GPL, with no seat count, no feature tiers, and no license server.

For a solo engineer, a student, or a small hardware team, that difference alone often decides it. The boards you design in KiCad are entirely yours to manufacture and sell.

Schematic capture and PCB layout#

This is closer than the price gap suggests.

KiCad supports up to 32 copper layers, so layer count itself is almost never the limiting factor. And it now handles the fundamentals of high-speed layout well: a proper stackup editor, an impedance calculator, and length- and delay-matching in the router — so controlled-impedance and matched-length work is well within reach. Altium's genuine advantages sit above that baseline, and they're worth naming specifically.

Where Altium genuinely still wins#

These are the advantages Altium users consistently point to. They're specific, not vague — and they matter most as boards and teams get more complex:

• Supply-chain intelligence. ActiveBOM ties your BOM to live distributor pricing, stock, lifecycle (end-of-life / new-revision flags), and alternates via Octopart. In KiCad you check availability yourself — sourcing is manual.
• High-speed constraint management. Altium's xSignals define topology-aware constraints across a whole signal path — through series resistors, connectors, and multiple components — alongside a built-in signal-integrity simulator. KiCad does per-net and per-pair length/delay tuning well, but not xSignals-style path constraints or SI simulation.
• HDI and advanced vias. Blind, buried, and microvias with full rule-driven management across complex HDI stackups, plus back-drilling. KiCad's via/HDI handling is more limited.
• Power integrity. A dedicated PDN / IR-drop analyzer. KiCad has no built-in power-integrity simulation.
• ECAD–MCAD and data management. Altium 365 brings cloud collaboration, managed components, and real-time mechanical-clearance checks with MCAD without round-tripping files. KiCad exports clean STEP models but leaves the data-management workflow to you.
• Multi-board systems and mature rigid-flex. System-level connectivity across multiple boards and harnesses, and a more mature rigid-flex flow.
• Draftsman. A parametric documentation tool for fabrication and assembly drawings.

The through-line: Altium reduces setup and rework the more complex the board and the larger the team. For a solo engineer or a small team on a standard board, most of that never comes into play — which is exactly why KiCad wins so often.

Manufacturing outputs: where the "is it professional?" question really lives#

Ask why someone thinks KiCad "isn't professional enough" and it usually isn't about the editor. It's about everything after you finish the layout:

• Exporting Gerbers, drill files, a BOM, and a pick-and-place file by hand, every revision.
• Files getting out of sync — a Gerber set from one revision, a BOM from another.
• No standard, repeatable manufacturing package to hand a fab or a client.

Altium bakes a lot of this into "Output Jobs." KiCad can produce every one of those outputs — it ships kicad-cli, a command-line tool that exports Gerbers, drill files, BOM, and more without opening the GUI — but wiring that into a repeatable process is left to you.

That gap is a process problem, not a KiCad limitation. And it's exactly the gap GoForFab closes: connect a KiCad project and every push regenerates the full manufacturing package automatically — Gerbers, BOM, CPL, DRC/ERC reports, 3D renders — so your outputs are always current and always reproducible.

Version control and collaboration#

Altium has enterprise data management (Altium 365 / Concord Pro). KiCad's files are plain text and Git-friendly, but KiCad doesn't prescribe a workflow — so many KiCad users still email board_final_v2.zip around.

The good news: because KiCad files are text, Git works beautifully once you set it up. A proper Git workflow gives you history, diffs, and reproducible releases — the professional-grade traceability people assume only Altium offers.

When to choose which#

Choose Altium if: you need live supply-chain intelligence in your BOM (ActiveBOM), topology-aware high-speed constraints (xSignals) or signal/power-integrity simulation, HDI with blind/buried/microvias, multi-board system design, or your organization runs on Altium 365 for managed data and ECAD–MCAD collaboration.

Choose KiCad if: you want a free, fully-owned toolchain that covers the vast majority of real-world boards, you're a student or small team, or you're willing to put a little structure around outputs and version control to reach the same professionalism.

The honest conclusion#

KiCad is a professional tool. The stereotype that it "isn't ready for real hardware" is a decade out of date for the editor itself. What's usually missing is the workflow — automated outputs, version control, a standard manufacturing package — and none of that requires Altium's price tag. It just requires setting it up once.

That's the whole idea behind GoForFab: give a KiCad project the automated, professional output pipeline that makes the "is it professional?" question disappear.