JITX lets engineers express electronics design in code and use an approved AI to revise it. Flux extends the work across electronics, mechanical design, firmware, and manufacturing in one project.
Flux works as an AI hardware engineer for your team. Give it a requirement. It plans the design, selects parts, creates the schematic, routes the board, designs mechanical parts, and writes firmware. It checks its work with simulation and design rule checks, then provides manufacturing files.
JITX is software-defined electronics. Engineers use Python to describe requirements, constraints, stackups, and engineering rules, and an approved AI can edit that code.[1]
JITX runs on a local computer or your infrastructure with approved AI models. Its documentation lists a VS Code extension, CLI, and JITX app.[4]
Engineers express requirements, constraints, stackups, and engineering rules in Python code.[1]
JITX generates schematics, board structures, routing, fencing, and pin assignments, with a topological autorouter.[1]
JITX can set up HFSS ports, sweeps, boundaries, and metrics from requirements, then use results in the next code edit.[1]
JITX uses code to generate electronics designs. Flux brings electronics, mechanical design, and firmware together in one project. Its AI hardware engineer works across the board and mechanical parts, writes firmware for the board, and provides manufacturing files and orders.
| Feature | Flux | JITX |
|---|---|---|
| Requirements and specification | The AI engineer turns your idea into requirements and a product specification, and checks the design against them. | Requirements, constraints, stackups, and engineering rules are expressed in Python.[1] |
| What it is | AI hardware engineer with its own design tools | Software-defined electronics design expressed as Python code.[1] |
| Where it runs | In your web browser. Nothing to install. Your projects live in the cloud. | VS Code extension and CLI.[4] |
| Who does the design work | The Flux agent. Your engineers review and edit. | Engineers read, review, and run the design code; approved AI can edit it.[1] |
| Schematic and parts | Built in. Picks from 734,000+ public parts. | Generates schematics, board structures, and pin assignments.[1] |
| Board layout and routing | Built in | Generates board structures and routing from code.[1] |
| Placement and routing | The AI engineer places the parts and routes the board like an experienced designer. Your engineers review and edit. | Includes a topological autorouter.[1] |
| High-speed design | The AI engineer routes differential pairs and length-matched buses such as DDR, tunes length and skew, fans out BGAs with blind, buried, and microvias, and sets trace impedance from your stackup. It checks the routed board with S-parameters, TDR, eye diagrams, and crosstalk analysis. Your engineers review and edit. | Uses signal-integrity constraints and HFSS results in the design workflow.[1] |
| Flex and rigid-flex boards | Built in. Named stackups for rigid and flex areas, coverlay and stiffeners, hatched flex pours, bending lines with a folded 3D view and folded STEP files, flex design checks, and Gerber, ODB++, and IPC-2581 files. The AI engineer routes each area on its own layers. | Not built in. JITX focuses on code-defined electronics design.[4] |
| Parts and sourcing | 734,000+ public parts, with live prices and stock from distributors | The team defines the electronics design in Python code.[1] |
| Simulation and design rule checks | SPICE, power delivery network, full-wave electromagnetic, signal integrity, thermal, and mechanical simulation, plus design rule checks | HFSS setup includes ports, sweeps, boundaries, and metrics from requirements.[1] |
| Firmware | Writes firmware for the board it designed | Not built in. JITX focuses on code-defined electronics design.[4] |
| Wiring harnesses | Built in. Flux designs the wiring harnesses between the boards: connectors, pinouts, and wires, in the same project. | Not built in. JITX focuses on code-defined electronics design.[4] |
| Manufacturing files | Gerber, ODB++, IPC-2581, bill of materials, pick-and-place, and more; Flux can check the files before you order, including copper gaps, silkscreen, board outline, BOM, and pick-and-place files. | Not built in. JITX focuses on code-defined electronics design.[4] |
| Quotes and orders | Quotes and orders for boards, 3D printing, CNC machining, and wire harnesses, from the project. | Not built in. JITX focuses on code-defined electronics design.[4] |
| Import from other tools | Imports complete projects from Altium, OrCAD and Allegro, KiCad, PADS and Xpedition, CADSTAR, Eagle, Fusion Electronics, EasyEDA, DipTrace, and SOLIDWORKS PCB. Flux imports Labcenter Proteus SDF netlists with Specctra board exports. IPC-2581 revision B and C files become board projects with reusable footprint parts. | Enterprise lists integrations with KiCad, Altium, Siemens Xpedition, and PLM.[2] |
| Versions, branches, and merges | Full change history. The AI engineer forks a design into a second version, keeps both, and merges the changes that you pick. | Not built in. JITX focuses on code-defined electronics design.[4] |
| Who reviews the work | The whole team, in one live project in the browser: electrical, layout, mechanical, and firmware engineers | Engineers read and review the code, and their approved AI can edit it.[1] |
| Product images, videos, and documents | Product images, product videos, datasheets, and regulatory documents, made from the design in the project. | Not built in. JITX focuses on code-defined electronics design.[1] |
| Price | See current pricing | Free for open-source designs under CERN OHL-Permissive v2; Enterprise is locally hosted for proprietary designs.[2] |
| Plus the mechanical parts too | ||
| Mechanical CAD | Built in, kernel agnostic. From an enclosure to a complete robot arm. | Not built in. JITX focuses on code-defined electronics design.[4] |
| Mechanical simulation | Finite-element stress, thermal, and airflow simulation | Not built in. JITX focuses on code-defined electronics design.[4] |
| Mechanical manufacturing | STEP, STL, and 3MF files, plus quotes for 3D printing, CNC machining, sheet metal, and laser cutting | Not built in. JITX focuses on code-defined electronics design.[4] |
| CNC toolpaths and G-code | The AI engineer writes the toolpaths, the G-code, a toolpath preview, and a setup sheet for the parts that it designed. | Not built in. JITX focuses on code-defined electronics design.[4] |
Flux places the parts and routes the board like an experienced designer, and it respects your design intent and your layout rules.
Flux picks from 734,000+ public parts. It checks live prices and stock across distributors before it puts a part on the board.
Flux checks every board against your layout rules and the capabilities of your fabricator.
Flux reads the datasheet of every part and checks the design against its pinouts, ratings, and limits.
Import an existing ECAD project, then connect the electronics with mechanical parts and firmware in the same project.
Example request
“Design a power controller board, its enclosure, and the firmware for the board.”
Altium Designer 
OrCAD and Allegro 
KiCad 
PADS, Xpedition, and NX 
CADSTAR 
Eagle and Fusion 
EasyEDA 
SolidWorks 
CATIA 
Creo 
Onshape Import complete projects, part libraries, and 3D models. Schematics, parts, and placement come across, and routing from most formats.
Imported designs are ready to edit right away. Ask "move the USB cutout 3 cm left" or "make the enclosure tighter", and Flux does the work.
Flux hands you the files that your manufacturer needs: Gerber, ODB++, IPC-2581, bill of materials, and pick-and-place for the board, and STEP, STL, or 3MF for the mechanical parts.
Orchestration
Hand Flux a complete product. The lead AI engineer splits it into workstreams, starts parallel threads across projects, manages them, and reports back.
Each workstream runs in its own agent thread. The main board, the daughterboards, and the enclosure come together at the same time.
The lead engineer starts work in other projects and tracks it all from one place.
It monitors every thread, steers work that goes off the brief, and collects the results.
Changes that move an interface or resize a board wait for your approval.
Flux writes a brief for each board with its outline, mounting holes, connectors, and the enclosure openings they line up with. Each board gets its own project and its own AI engineer, and all three are designed in parallel. Flux then places the finished boards in the main assembly and measures clearances and connector alignment in millimeters.
Verification lab
Flux doesn't stop at generating designs. The AI engineer simulates and checks its own work with professional-grade solvers, and it shows you the results.
SPICE simulation of analog, power, and mixed-signal circuits, with Monte Carlo, temperature sweep, and noise analysis, run and read by the AI engineer.
Full-wave simulation of the routed board: signal integrity, power integrity, impedance, S-parameters, crosstalk, and antennas.
Electrical and manufacturing rule checks on every schematic and board.
Reads the datasheet of every part and checks the design against its pinouts, ratings, and limits.
Flux runs PCB thermal analysis of the routed board at stated operating powers, plus heat and airflow simulation of the enclosure, before you build.
Airflow and cooling through the enclosure, so vents, fans, and heat sinks work before the first prototype.
Finite-element stress analysis of brackets, enclosures, and mounts.
Sourcing
Flux connects directly to major electronics and mechanical parts distributors. The AI engineer picks chips, connectors, screws, and standoffs that are in stock, compares prices across distributors, and replaces parts that are at end of life before the product goes to production.
Digi-Key 
LCSC 
Mouser 
Arrow 
Verical 
TME 
HQonline 
McMaster-Carr 
MISUMI 
JLCMC Manufacturing
Flux gets quotes directly from the fabricators for circuit boards and assembly, 3D printing in plastic and metal, CNC machining, sheet metal, laser cutting, injection molding, casting, and wiring harnesses. The AI engineer compares price and lead time, checks the design against each fabricator's rules, keeps the quote current as the design changes, and places the order when you confirm.
JLCPCB 
PCBWay 
OSH Park 
AISLER 
Craftcloud JLC 3D printing PCBWay 3D printing 
Shapeways 
OSH Cut 
SendCutSend 
MiniProto One Flux project holds the board, mechanical parts, and firmware. The AI hardware engineer can update the board and mechanical parts together.
Give Flux a requirement. It creates the product specification and checks the design against it.
Flux designs mechanical parts alongside the electronics, so mounting holes, connectors, and enclosure features stay in the same project.
Flux provides 734,000+ public parts with live pricing and stock from distributors.
Flux runs circuit, electromagnetic, thermal, and mechanical simulation, plus design rule checks.
Flux provides manufacturing files and project-based quotes and orders for boards, mechanical parts, and wire assemblies.
One platform
Flux is not a collection of disconnected CAD applications. It is one AI-native engineering platform where every discipline shares the same project, the same data, and the same AI engineer.
Parametric enclosures, brackets, and mounts, fitted to the real board's mounting holes and connectors. Bring in your own STEP models. One parts library for the whole product: chips and connectors, devices that are not on the board, and mechanical hardware such as screws and standoffs.
Firmware for the board Flux designed, for example on Arm Cortex-M, RISC-V, AVR, or Pico, then built, analyzed, and unit tested.
Model-agnostic AI
Flux pairs frontier AI models with a state-of-the-art agent harness built for CAD and EDA. The models bring reasoning. Flux brings the engineering tools, project context, and workflows that turn that reasoning into working hardware.
Adaptive splits every engineering job into tasks and gives each task to the model that does it best for the price. Hard design decisions go to frontier models. Routine work goes to fast, low-cost models. Independent tasks run in parallel, so complete devices come together faster. Your team works with one AI engineer, and Flux handles the delegation behind the scenes.
Work with the frontier models your team already trusts, inside Flux.
Every model gets Flux's specialized engineering tools, project context, and workflows.
When a better model ships, your team gets it without switching engineering platforms.
Avoid depending on any one model provider for your engineering capacity.
Adaptive matches each engineering step to the model that does it best, from deep design decisions to routine checks.
See current pricing
Trial terms depend on your current offer.
See current pricing
Trial terms depend on your current offer.
See current pricing
Trial terms depend on your current offer.
See current pricing
Teams subscriptions start paid.
Eligible individual plans include a free trial. Teams subscriptions start paid; trial and pricing terms depend on your current offer. See all plans
Use JITX when your team wants to define electronics in Python and run it on its infrastructure. Choose Flux when the project includes electronics, mechanical design, and firmware in one place.
Explore individual plan offers, or book a demo with our team.
