Professional PCB design follows a predictable three-stage process. Flux accelerates each stage by removing friction points, whether that's import complexity, routing tedium, or manufacturing tolerances. Here's what the workflow looks like:
Describe
Start with your schematic: component placement, trace routing, and electrical rules. Most free PCB design software gives you full manual control over placement and routing. Flux takes a different approach: import schematics from KiCad, Cadence, or Altium (Pro plan), then use AI Auto Layout to suggest placement and routing in seconds. Your AI hardware engineer learns your design rules and applies them consistently across the board.
Example: "Design a smart humidity sensor with WiFi and USB-C charging"
Design
Refine your layout, verify electrical rules, and optimize for manufacturing. Free PCB design software handles the fundamentals well. Flux adds a layer on top: the AI hardware engineer reviews your design in real time, flagging problems (trace spacing violations, unshielded critical nets, thermal hotspots) and suggesting fixes before your board reaches the fabricator.
Hand-route the critical 20%. AI routes the other 80%.
Manufacture
Export your design to manufacturers (JLCPCB, PCBWay, Osh Park, others) or your contract manufacturer. Some free PCB design software requires manual DFM compliance checks and output file formatting. Flux includes native templates for major manufacturers, so your design automatically formats for production with correct layer stack, tolerances, and file structure.
Your files. Your manufacturer. No lock-in.
Free PCB design software has come a long way, and tools like KiCad are genuinely excellent. But there are areas where AI-powered design changes what's possible. Here's where Flux adds the most value:
Free PCB design software gives you full manual control, which is great for learning and precision. But for complex boards, manual routing, placement, and rule verification add up. An AI hardware engineer working alongside you can significantly reduce that time.
How Flux solves it: Our AI hardware engineer handles 80% of routing and placement logic. You skip the tedious manual work and focus on design intent.
Free PCB design software typically runs locally, with collaboration through file sharing or version control (KiCad supports Git, for example). For teams that need simultaneous editing, this can add coordination overhead.
How Flux solves it: Real-time multiplayer collaboration is built in. Flux syncs your designs to the cloud and keeps every collaborator in sync.
Free PCB design software is powerful, and with that power comes complexity. Routing trace widths for impedance control, designing layer stacks, understanding differential pair spacing: these are skills that take time to develop. Community forums and documentation help, but the ramp-up to competency can take significant time.
How Flux solves it: Our AI hardware engineer teaches as you design.
Free PCB design software exports standard formats, but manufacturing-specific constraints (tolerances, lead times, cost optimization) often require manual checking. Getting your design fab-ready sometimes means a few extra steps between design and production.
How Flux solves it: Real-time multiplayer editing — like Google Docs for circuit board design. Multiple engineers on the same board simultaneously. Comment, review, and iterate with built-in version history.
When using free PCB design software, the workflow often spans separate tools: design in your EDA, check component availability on distributor sites, export manufacturing files, and upload to your fab separately. Each step works, but the handoffs take time.
How Flux solves it: No context switching, no manual steps, no wasted time.
Routing is where circuit board design projects stall. Flux's AI Auto Layout is a reinforcement learning model trained on professionally routed boards, making intelligent decisions about trace separation, ground continuity, and signal integrity.
Flux AI handles part research, schematic generation, component placement, routing, and design rule checks. Describe what you want to build, and AI delivers a starting point you can refine.
Create and edit schematics with a full component library. Every change syncs instantly to your PCB layout, keeping your design consistent throughout.
Place components, define board outlines, and route traces with AI assistance. Flux supports multi-layer designs with impedance-aware routing and real-time DRC.
Design with real-time inventory, pricing, and alternate part suggestions. Your BOM is always sourced and ready to order.
Validate your design before manufacturing with built-in SPICE simulation. Test circuits, verify parameters, and catch issues early.
Work with your team in real time on the same schematic and layout. Built-in version control, comments, and role-based permissions keep everyone aligned.
Work with Flux.ai like an engineering intern: automating the grunt work, learning your standards, explaining its decisions, and checking in for feedback at key moments.
Desktop install required
100% Browser-based
Design alone, email files
Real-time multiplayer
No AI assistance
AI help built-in
Manual part research
Live inventory
Need separate tools
All-in-one platform
$10K+/seat licenses
Free to start
Loved by engineers pushing hardware design forward.
No, Flux is not free, but it includes a 14-day free trial on all paid plans. Starter costs $20/month, Pro costs $142/month per editor. Students and educators get Pro for free. We believe in being upfront: Flux is a paid tool because building an AI hardware engineer requires significant investment. The 14-day free trial lets you see if the AI-assisted workflow saves you enough time to be worth it.
The most popular free PCB design tools are KiCad (open-source, powerful, community-driven), EasyEDA (cloud-based, beginner-friendly), and LibrePCB (modern UI, growing community). All three are capable tools that have helped millions of engineers ship real hardware. Flux is different in that it adds an AI hardware engineer, real-time multiplayer collaboration, and an integrated component database. If you're happy with your current free tool, that's great. If you want to see what AI adds, Flux's 14-day trial is a good way to compare.
Free tools like KiCad cost nothing. Professional desktop suites (Altium Designer, Cadence, Mentor Graphics) run $7K-15K per year per seat. Flux sits in between at $20/month for Starter or $142/month for Pro. Students and educators get Pro free. The right choice depends on your needs: free tools for zero-cost access, Flux for AI-assisted workflows, desktop suites for maximum feature depth in specialized industries.
AI Compute Units (ACUs) measure how many boards you can design with AI assistance per month. Starter includes 10 ACUs (roughly 10 simple boards, 5 medium boards, or 2 complex boards per month. Pro includes 100 ACUs per month. Additional ACUs cost $2.50 (Starter) or $2.00 (Pro) each. Most users never run out, but if you're designing boards constantly, you can add more anytime.
Yes. KiCad on all plans; Altium and Cadence on Pro. For Altium, export in ASCII format. Binary exports will import empty.
Yes. Gerbers, BOM, and pick-and-place files compatible with any manufacturer. AI checks component availability before export.
Flux AI handles part research, schematic generation, component placement, route optimization, and design rule checks. It works best as a collaborator: it makes suggestions and explains its reasoning, and you make the final call. It accelerates your workflow but does not replace engineering judgment.
In-app chat with real engineers, documentation, YouTube tutorials, and direct support via help@flux.ai. Common issues like DRC violations and import problems are well-documented.
Automated DRC runs continuously, catching overlapping copper, floating traces, and ground fill issues. Click any violation to jump to it. AI Review adds a second layer before export.
Yes. Flux supports real-time collaboration with multiple engineers on the same schematic and layout simultaneously. Changes sync instantly, and version history tracks every edit.
