Flux 3
Summary
PCB design tools have always demanded you context-switch between schematic capture, layout, BOM sourcing, and DRC — each in a separate tool, each with its own learning curve and its own way of losing your work. Flux collapses that loop into a single browser-based environment where an AI agent plans, generates netlists, places components, and checks in with you before moving to the next step.
The agent doesn't hand you a finished board and disappear — the vendor describes a multi-step workflow where the AI surfaces its reasoning at each stage, from architecture decisions down to pull-up resistor sizing on I²C lines, so you can catch a bad assumption before it propagates into layout. Live component sourcing runs inside the tool, which means BOM reality is checked at design time rather than after you've routed a part that's been on allocation for six months. Collaboration and version control are built in, which removes the 'who has the latest Altium file' problem that derails team projects. The ceiling appears on complex, high-density boards where AI layout suggestions will still require significant manual intervention — no tool in this category automates that away cleanly. Teams without a hardware engineering background will also find that explainable AI steps surface reasoning they may lack the context to evaluate.
Bottom line: Flux earns its place on a prototype-to-production pipeline for IoT nodes, RF boards, and power delivery designs where the AI's step-by-step planning genuinely compresses iteration time — but teams building high-layer-count, signal-integrity-critical boards will hit the limits of AI-assisted layout and revert to manual routing in a dedicated EDA tool.
Pricing Plans
Subscription- Price
- $20 per month
Starter
Entry paid plan with monthly ACUs
Pro
Higher tier with more ACUs
Teams
Team plan with project permissions
View full pricing on flux.ai →
Pricing may have changed since last verified. Check the official site for current plans.
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Pros
Sign in to edit- AI generates netlists with explainable intermediate steps, so you can catch a wrong architectural assumption before it's embedded in the layout rather than discovering it in a design review.
- Live component sourcing runs at design time, which means you avoid the respin triggered by specifying a part that's unavailable when you're ready to order.
- Datasheet parsing is handled inside the platform, so pulling pin assignments and electrical specs doesn't require a separate tab and manual transcription that introduces errors.
- Built-in real-time collaboration and version control removes the file-locking and 'latest version' confusion that slows down multi-engineer hardware teams.
- Pre-built templates for common connectivity patterns — BLE, LoRaWAN, USB-C, CAN FD, I²C — give you a validated starting point for the subsystems that appear on almost every embedded board, cutting the time spent on boilerplate.
Cons
Sign in to edit- AI-assisted layout hits a practical ceiling on high-density boards: the agent can place components and suggest routing, but complex signal-integrity constraints — controlled impedance, differential pairs on tight geometries, high-current power planes — require manual intervention that experienced PCB engineers will spend significant time on anyway. Teams building RF or high-speed digital boards at production complexity find the AI layout suggestions are a starting point, not a deliverable.
- The platform is cloud-only with no self-hosted option. Any team subject to ITAR, EAR, or internal IP containment policies cannot use this tool for controlled designs. That's not a workaround situation — those teams switch to on-premise EDA environments regardless of what the AI feature set offers.
- Engineers without a hardware background will find the explainable AI steps expose reasoning they can't confidently evaluate — the tool surfaces why it chose a pull-up value or a protection topology, but acting on that explanation requires the domain knowledge to judge it. Teams without that coverage end up approving steps they can't verify, which shifts risk rather than removing it.
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About
- Platforms
- Web browser
- API Available
- No
- Self-Hosted
- No
- Last Updated
- 2026-07-24T05:05:01.574Z
Best For
Who it's for
- Engineers building prototypes to production PCBs
- Teams needing real-time collaboration and version control
- Designers wanting AI assistance with explainable steps
- Users requiring live component sourcing data
What it does well
- IoT and meshed sensor nodes
- Embedded AI hardware
- Robotics and adaptive systems
- RF, telemetry, and power delivery boards
- Industrial automation controllers
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Frequently Asked Questions
- Is Flux 3 free?
- Flux 3 has a permanent free tier alongside paid upgrades (paid plans from $20 per month). You can keep using a baseline version indefinitely without paying.
- Is Flux 3 open source?
- No — Flux 3 is a closed-source tool. Source code is not publicly available.
- What platforms does Flux 3 support?
- Flux 3 is available on: Web browser.
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Curated lists that include this category
Flux is a browser-based PCB design platform where an AI agent — the vendor calls it Copilot — handles the full design chain: architecture planning, schematic generation, netlist creation, component placement, and design review, with checkpoints for engineer sign-off at each stage. The workflow is prompt-driven; you describe what you want to build, specify the key subsystems and constraints, and the agent produces explainable plans before executing. The page describes use cases spanning IoT sensor nodes, embedded AI hardware, robotics, RF and telemetry boards, industrial automation controllers, and power delivery modules — covering both the analog and digital domains that typically require separate specialist tools.
The differentiating capability is the combination of AI-generated netlists with live component sourcing data. Rather than designing around an ideal BOM and reconciling availability later, the tool surfaces real-world part availability during the design phase — a gap that has historically caused expensive respins when a specified component is unavailable or discontinued. Datasheet parsing is also handled inside the tool, so you’re not toggling between a PDF viewer and your schematic to pull pin assignments or electrical characteristics.
Flux fits teams who move from whiteboard to production PCB and want AI assistance with explainable, reviewable steps rather than a black-box output. It is not self-hosted — all design data lives in Flux’s cloud environment, which is a hard blocker for teams working under export control or strict IP containment policies. There is no on-premise option described on the vendor page. Teams with those constraints will evaluate on-premise EDA tools regardless of the feature set here.
The platform supports a wide range of interface and protocol templates natively — including BLE 5.x, LoRaWAN, CAN FD, USB-C with proper CC configuration, and isolated I²C and SPI buses — which shortens the time to a working reference design for common embedded connectivity patterns. Firmware generation and AI-assisted testing and debugging are also listed as capabilities, extending the tool’s scope beyond the schematic and into the embedded software layer.