Key takeaways
- Decide which stage you want AI to take first: drafting from a prompt, placing or routing a board you prepared, working from requirements, or assisting inside a suite you already use. Compare tools only within that group.
- Write one specific brief with a few deliberate traps, such as USB-C CC resistors or an antenna keep-out, and paste the same text into every tool.
- Score each tool on the same eight checks: real parts, files you can edit and keep, ERC, an independent KiCad DRC with your fab's rules, placement respected, fab outputs, cost to finish and data terms.
- Judge your own review time, not the demo. The best tool is the one that gets you to a board you would order with the least fixing.
Choose AI PCB software by running the same small brief through each candidate and checking what comes back, not by comparing feature lists. In one afternoon you can test what matters: real parts, files you can edit and keep, a clean result in an independent DRC, what it costs to finish the board, and what leaves your machine.
First decision
Decide which stage you want AI to take
The tools in this space cover different parts of the flow, so comparing them head to head only makes sense inside a group. Start by deciding which stage you want help with, then test only the tools that cover it. The names below are examples we have read about on the vendors' own pages, listed alphabetically; our comparison page has the full table with sources and dates.
Prompt to board
Draft a design from a written brief
Cherry Blossom, Flux, PCBEditor, ProtoFlow and Trace take a written prompt toward a board, with different limits on what is free and what stages they cover.
Routing services
Place or route a board you prepared
DeepPCB and Quilter are cloud services for a design you prepare in your own ECAD tool: Quilter places and routes it, and DeepPCB routes a placed board.
Requirements first
Start from requirements or a block diagram
Tools such as CELUS and Circuit Mind start from requirements and work toward the architecture, schematic or bill of materials, then hand off to a layout tool.
Established suites
AI inside the tool your team already uses
Cadence describes Allegro X AI as automating placement, power planes and critical-net routing. KiCad 10 is free and open source, with no built-in AI.
The brief
Write one brief and reuse it for every tool
Pick a board you understand well enough to judge: small, conventional and with one or two details that a careless design gets wrong. Write it once, specifically, and paste the same text into every tool. Changing the brief between tools makes the comparison meaningless.
A sensor board built around an ESP32-S3 module with native USB.
Powered from USB-C at 5 V, with a 3.3 V regulator sized for Wi-Fi current peaks.
One I2C temperature sensor, a status LED, a reset button and a boot button.
Two layers, 40 × 30 mm, USB-C on the short edge, antenna overhanging the opposite edge.
Use JLCPCB's standard two-layer rules and parts that JLCPCB can assemble.
This brief has traps on purpose: the USB-C CC resistors, the strapping pins and enable delay on the ESP32-S3, the regulator current, and the antenna keep-out. A tool that gets all four right without being told is doing real work.
The checks
Score every tool on the same checks
| Check | How to test it | Why it matters |
|---|---|---|
| Real, orderable parts | Open the BOM and look up three part numbers at the distributor | A design built from generic symbols leaves the part hunt to you |
| Files you can edit and keep | Save the native project, then export to KiCad or your own ECAD tool and open it there | If you cannot leave, you cannot check the work or switch tools later |
| Clean schematic | Run ERC and read every warning | Floating enables and shorted outputs show up here first |
| Clean board in an independent DRC | Open the export in KiCad, load your fab's rules, refill zones, run DRC; count errors and unconnected items | A tool's own check is not a second opinion |
| Your placement respected | Place a few parts yourself, lock them, then let the tool route | Placement is where your judgement goes; a tool that moves it undoes your work |
| Fab outputs | Export Gerbers, drills, BOM and placement files; open the Gerbers in a viewer | What the factory builds is the files, not the screen |
| Cost to finish | Note every point where the tool asks for payment, credits or an upgrade | A trial that ends mid-board costs more than its price says |
| What leaves your machine | Read the terms on data use and training, and look for an opt-out | Unreleased hardware is confidential until you decide otherwise |
# one block per tool, filled in as you gotool: ____________ date: __________time to a reviewable board: ___ minreal parts (3 of 3 orderable): yes / noopens in KiCad: yes / noERC: ___ errors DRC (KiCad, fab rules, refilled): ___ errors, ___ unconnectedplacement kept: yes / noGerbers open cleanly: yes / nopaid to finish: $____ where it asked: ____________training opt-out: yes / no / not statedmy review time: ___ min
Reading the result
Judge the review time, not the demo
The number that matters most is the last one on the scorecard: how long it took you to get from what the tool produced to a board you would order. A tool that produces something impressive in two minutes and leaves you an hour of fixes is slower than one that takes ten minutes and leaves you fifteen. Time your own review honestly, including the datasheet checks.
No tool in 2026 produces a board you should order without checking it, and the credible vendors do not claim otherwise.
If you cannot open the files, you cannot run your own checks on them.
Which checker, how many attempts, whether every attempt counted, and on which boards. Without those, a score is marketing.
Useful for this test, but check what it covers, how long it lasts and what the terms say about your data.
Our own tool
Holding ProtoFlow to the same test
Run ProtoFlow through the same checks as everything else. It is a desktop app for Windows, macOS and Linux that takes a written brief through schematic, PCB layout, SPICE simulation and manufacturing files, and opens and saves KiCad, Altium and EAGLE projects, so the independent DRC check is a matter of opening the saved project in KiCad. The free plan includes the full PCB editor and a small daily AI allowance (5 Basic and 10 Pro AI messages a day), with no card and no expiry.
Where it falls short: the free AI allowance is small, it does no signal-integrity analysis, it needs a desktop install, and every AI draft needs an engineer's review. AI training on prompts and designs is on unless you turn off "Help improve ProtoFlow AI" in the app's privacy settings; for EU and UK users it is off unless they opt in. Our published results come with their conditions: 98 of 99 small boards clean on PCBWorld-Bench (13 October 2026, KiCad's DRC, one attempt per board, every attempt counted, with Claude Opus 5.5 as a paid setup), and the Rodeostat routed with all 372 connections, zero KiCad errors and no part moved. That is evidence for those boards. Your brief is the test that counts.
Frequently asked questions
How do I choose AI PCB design software?
Decide which stage you want AI to handle, then run the same small brief through each tool that covers it. Check the parts are real, the files open in KiCad or your own ECAD tool, the board passes an independent DRC with your fab's rules, and note the cost to finish and the data terms. Pick the one that leaves you the least review work.
What should I test during a free trial of an AI PCB tool?
One complete board, start to finish: a brief you understand, then the BOM, an export to your own ECAD tool, ERC and DRC, the Gerbers and the point where the tool asks for payment. A trial that ends before you reach fab files has not told you much.
Do AI PCB tools train on my designs?
Some do by default, so read each tool's terms before uploading confidential work. ProtoFlow may use AI prompts and design data to train its models unless you turn off "Help improve ProtoFlow AI" in the app's privacy settings; for EU and UK users it is off unless they opt in.
Is a benchmark score enough to choose a tool?
No. A score helps only when it states the checker, the boards, the number of attempts and whether every attempt counted, and even then it covers those boards. Your own brief, scored the same way for every tool, is the test that applies to your work.
Sources
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