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About

CircuitSim is a full SPICE circuit simulator with a 3,000+ component library and a modern schematic editor. No install, free to get started. Built for students, educators, and professionals. It runs in a browser tab and needs no admin rights, so it works on Chromebooks and locked-down school laptops. Run seven kinds of analysis: interactive, interactive operating point, transient, AC sweep, DC operating point, DC sweep, and parameter sweep. Results plot on oscilloscope-style charts, with probes you can drop anywhere in the circuit. Define custom parts from SPICE model text or import KiCad symbols. CircuitSim also imports Multisim Live designs ahead of that product's retirement on September 15, 2026. It is the only browser tool that opens .csim, .ms14, and .msjs files, and it rebuilds the schematic with wiring, placement, net labels, probes, and simulation settings intact. Classroom licensing adds seat assignment, anonymous student seats, and private student work.

About

ProtoFlow is an AI-native desktop electronic design automation (EDA) tool for schematic capture and PCB design. Describe a circuit in plain language to create an editable first draft, search real electronic parts and footprints, inspect datasheets, clean up wiring, and continue manually in familiar schematic and board editors. ProtoFlow supports ERC/DRC review, 3D board inspection, Git-backed versioning and visual diffs, comments and collaboration, plus manufacturing outputs including Gerber, drill, BOM, and placement files. Designs remain normal editable geometry, and users should verify symbols, footprints, connections, and manufacturing data before production. ProtoFlow can read and write native KiCad files and export to established EDA workflows. A free plan is available without a credit card, with paid options for higher AI usage. It is built for hardware engineers, makers, students, educators, researchers, and electronics startups.

Platforms Supported

Windows
Mac
Linux
Cloud
On-Premises
iPhone
iPad
Android
Chromebook

Platforms Supported

Windows
Mac
Linux
Cloud
On-Premises
iPhone
iPad
Android
Chromebook

Audience

Engineering students, professors and teachers, makers and hobbyists, and practicing engineers

Audience

Hardware engineers, makers, electronics students, educators, researchers, and hardware startups.

Support

Phone Support
24/7 Live Support
Online

Support

Phone Support
24/7 Live Support
Online

API

Offers API

API

Offers API

Screenshots and Videos

Screenshots and Videos

Pricing

$2.99
Free Version
Free Trial

Pricing

Free
Free plan with no expiration or credit card required. Paid plans and add-on credits are available for increased AI access and higher usage limits.
Free Version
Free Trial

Reviews/Ratings

Overall 0.0 / 5
ease 0.0 / 5
features 0.0 / 5
design 0.0 / 5
support 0.0 / 5

This software hasn't been reviewed yet. Be the first to provide a review:

Review this Software

Reviews/Ratings

Overall 0.0 / 5
ease 0.0 / 5
features 0.0 / 5
design 0.0 / 5
support 0.0 / 5

This software hasn't been reviewed yet. Be the first to provide a review:

Review this Software

Training

Documentation
Webinars
Live Online
In Person

Training

Documentation
Webinars
Live Online
In Person

Company Information

CircuitSim
Founded: 2025
United States
circuitsim.com

Company Information

ProtoFlow
Founded: 2026
United States
www.protoflow.ai/

Alternatives

Alternatives

SpeedUp

SpeedUp

SpeedUp AI
TINA-TI

TINA-TI

Texas Instruments
Autodesk EAGLE

Autodesk EAGLE

Autodesk
CircuitLogix

CircuitLogix

Logic Design

Categories

Categories

PCB Design Features

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

Integrations

KiCad EDA

Integrations

KiCad EDA
Claim CircuitSim and update features and information
Claim CircuitSim and update features and information
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Claim ProtoFlow and update features and information