KiCad vs DipTrace: Free and Unlimited, or Paid Once and Tiered

Licensing is the real difference

DipTrace sells five perpetual editions, and the line between them is pins and signal layers. Starter is $75 for 300 pins and 2 signal layers, Lite $145 for 500 pins and 2 layers, Standard $395 for 1,000 pins and 4 layers, Extended $695 for 2,000 pins and 6 layers, and Full $995 for unlimited pins and layers. You pay once, 5.x updates are included, and DipTrace says major upgrades from 6.x on cost 25% of the full price.

KiCad has no editions. Every user gets every feature, the PCB editor goes to 32 copper layers, and the GPL license puts no restriction on what you design with it.

DipTrace also has free routes. Freeware never expires but is limited to 300 pins, 2 signal layers and non-profit use, and a 30-day trial unlocks everything. Hobbyists can apply for a non-profit license (Lite free, Full $348), and enrolled students and schools can get a free full-featured academic license.

How fast a real board hits a pin limit

Pin counts climb faster than people expect, because every pad counts. A board with a 48-pin microcontroller, a 16-pin USB-C connector, three SOT-23 regulators and forty two-terminal passives is already about 153 pins. Add a second chip, a debug header and a few more connectors and you are past the 300 pins of Freeware or Starter. A single large BGA can take a board past 500 on its own.

The layer limit has a useful nuance. Plane layers do not count against the signal-layer limit, so a four-layer stackup with signals on the outer layers and solid ground and power planes inside fits a 2-signal-layer edition. Route a signal on an inner layer and you need Standard or higher. DipTrace's File, Schematic Information and File, Design Layout Information dialogs report pin counts, so you can check a design against an edition before buying.

Platforms and where your files live

KiCad ships native builds for Windows, macOS and Linux. DipTrace runs on Windows (XP through 11, 32- and 64-bit) and on macOS 10.15.4 Catalina or later from an official DMG package. On Linux, DipTrace runs through Wine, which is a compatibility layer rather than a native build, so Linux users should try the trial before paying.

Both are local desktop applications that work offline. DipTrace publishes the specification of its XML project format and offers an AI Plugin SDK, so plugins (including ones written with AI coding assistants) can read and change designs. KiCad's project manager shows Git status in its file tree and supports Python plugins through its Plugin and Content Manager.

Moving designs between them

The two directions are not symmetric. DipTrace imports KiCad schematics, boards and libraries, alongside Altium, EAGLE, OrCAD, PADS, P-CAD, EasyEDA Pro and Pulsonix projects. KiCad's documented import formats do not include DipTrace.

The bridge is EAGLE. DipTrace's release notes list EAGLE schematic and PCB XML export, and KiCad imports EAGLE XML schematics and boards as a project. Export both from DipTrace with the same base name, import them into KiCad, and expect cleanup: run ERC and DRC and compare netlists before trusting the result.

Simulation and layout depth

DipTrace's schematic includes a SPICE simulator that it says handles analog, digital and mixed-signal circuits with behavioral models. Its layout side lists push-and-shove routing, differential pairs with phase and length tolerance, length matching, a shape-based autorouter, and calculation of trace, transmission-line and differential-pair parameters.

KiCad covers the same core: ngspice simulation, differential-pair routing, length tuning, DRC, and a PCB Calculator with a transmission-line tool. For most two- and four-layer boards, the deciding factor is which interface you work faster in. DipTrace pitches its interface as easy to learn, and both tools give you a free way to find out.

Where ProtoFlow fits

ProtoFlow is a free desktop PCB design app for Windows, macOS and Linux. Its free plan includes the full editor and AI with no card and no expiry: plain-language schematic drafting with real parts, an AI Copilot, LCSC, DigiKey and Mouser search, ERC, layout with an autorouter, DRC, a 3D view, and Gerber, drill and JLCPCB BOM and CPL files. It imports KiCad, Altium and EAGLE projects, so a DipTrace design can come across through the EAGLE XML route above.