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What is Flux?

Flux is online PCB design software for hardware startups, electronics engineers, and product teams. Teams can develop schematics, lay out printed circuit boards, run simulations, and check design rules in a web browser, without installing a desktop EDA application. The AI assistant supports component research, schematic generation from a plain-language circuit description, component placement, trace routing, and design review. Engineers remain responsible for setting constraints and approving the final design. Flux supports simultaneous editing, project comments, and access permissions for collaborative hardware development. Teams can reuse community designs and parts, check live component prices and availability, and prepare manufacturing outputs including Gerber, BOM, and pick-and-place files. For migration, Flux imports Altium ASCII and Cadence EDIF schematic files, plus KiCad component libraries. PCB layouts are not included in these imports. Trial access includes a limited AI allowance. After the trial, editing or exporting private projects and using AI require a paid subscription. AI usage is metered in Agent Compute Units (ACUs), with included allowances varying by plan. Public-project and community access remain available.

What is CircuitSim?

CircuitSim is an extensive SPICE circuit simulation platform that boasts a collection of more than 3,000 components alongside a modern schematic editor, all available online for free without any installation requirements. It is tailored for students, teachers, and professionals, functioning directly within a web browser, which allows it to be used seamlessly on devices like Chromebooks and school-issued laptops that may have restricted access. Users can engage in seven different analysis types, encompassing both interactive and transient analyses, with results visualized on oscilloscope-style graphs, and they have the option to place probes throughout the circuit for detailed observation. The platform also enables the creation of custom components from SPICE model text and the import of symbols from KiCad, greatly enhancing the simulation experience and versatility. CircuitSim further facilitates the importation of designs from Multisim Live prior to its planned discontinuation on September 15, 2026, making it a distinctive browser-based alternative capable of handling .csim, .ms14, and .msjs files while maintaining wiring, component arrangement, net labels, probes, and simulation settings intact. Additionally, there are classroom licensing options that introduce features like seat assignments, anonymous student seating arrangements, and dedicated private project spaces for students, which significantly enriches the learning environment. This comprehensive approach ensures that educators have the tools necessary to effectively oversee their classrooms while taking full advantage of sophisticated simulation technologies.

Media

Media

Integrations Supported

Additional information not provided

Integrations Supported

Additional information not provided

API Availability

API Availability

Pricing Information

$50/month (billed monthly)
USD. Monthly billing: Explore $50/month; Build $100/month; Pro $250/month. Annual billing (monthly equivalents): Explore $40/month; Build $80/month; Pro $200/month, billed annually. Teams $158/editor/month, or $120/editor/month billed annually. Enterprise: custom pricing.

14-day free trial with limited AI usage; selected plan starts afterward unless canceled. After the trial, editing or exporting private projects and using AI require a paid plan. Public-project/community access remains available. Pro trial requires a $250 hold (monthly) or $200 hold (annual).

AI usage is metered in Agent Compute Units (ACUs). Explore includes 40 ACUs/month; Build 120; Pro 400. Optional pay-as-you-go AI usage on Build and Pro costs $2/ACU; Teams supports optional pay-as-you-go and pooled usage.
Free Trial Offered?

Pricing Information

$2.99
Free Version

Supported Platforms

SaaS

Supported Platforms

SaaS
Chromebook

Customer Service / Support

Web-Based Support

Customer Service / Support

Web-Based Support

Training Options

Documentation Hub
Online Training

Training Options

Documentation Hub

Company Facts

Organization Name

Flux

Date Founded

2019

Company Location

United States

Company Website

www.flux.ai/p

Company Facts

Organization Name

CircuitSim

Date Founded

2025

Company Location

United States

Company Website

circuitsim.com

Categories and Features

AI CAD

Not specified

Engineering

Collaboration
Design Analysis
Design Export
Electrical Engineering

PCB Design

3D Visualization
Autorouting
Collaboration Tools
Component Library
Design Rule Check
Differential Pair Routing
Schematic Editor

Categories and Features

Circuit Simulation

Not specified

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