PCB123Sunstone Circuits
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Related Products
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About
PCB123 is a full-feature design tool for Printed Circuit Board designers of all levels. Introduced as a free tool in 2002, PCB123 still operates on a risk-sharing business model: We don't get paid until you succeed at designing your PCB. And to help ensure your success, we staff our technical support department with professionals that can answer your questions. So what's to stop you? Easy-to-use, and professional-grade PCB CAD software that's free and fully supported. We don’t throttle our tool and charge you for a license to give you full functionality. We get paid when you order boards – it really is that simple. software developer’s kit, with programmatic access to the PCB123 database, you can expand the tool for your own purposes. Our PCB layout specialists are available to help you stretch your resource dollars & speed your PCB prototyping cycle. Submit basic design information to get a quote.
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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.
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Platforms Supported
Windows
Supported
Mac
Not Supported
Linux
Not Supported
Cloud
Not Supported
On-Premises
Not Supported
iPhone
Not Supported
iPad
Supported
Android
Not Supported
Chromebook
Not Supported
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Platforms Supported
Windows
Supported
Mac
Supported
Linux
Supported
Cloud
Not Supported
On-Premises
Not Supported
iPhone
Not Supported
iPad
Not Supported
Android
Not Supported
Chromebook
Not Supported
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Audience
PCB design tool
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Audience
Hardware engineers, makers, electronics students, educators, researchers, and hardware startups.
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Support
Phone Support
Supported
24/7 Live Support
Not Supported
Online
Supported
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Support
Phone Support
Not Supported
24/7 Live Support
Not Supported
Online
Supported
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API
Offers API
Not Supported
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API
Offers API
Not Supported
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Screenshots and Videos |
Screenshots and Videos |
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Pricing
$0
FREE to use
Free Version
Supported
Free Trial
Not Supported
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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
Supported
Free Trial
Not Supported
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Reviews/
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Reviews/
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Pros & Cons from Real UsersPros
Cons
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Training
Documentation
Supported
Webinars
Not Supported
Live Online
Supported
In Person
Not Supported
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Training
Documentation
Supported
Webinars
Not Supported
Live Online
Not Supported
In Person
Not Supported
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Company InformationSunstone Circuits
Founded: 2002
United States
www.sunstone.com/pcb123-lp
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Company InformationProtoFlow
Founded: 2026
United States
www.protoflow.ai/
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Alternatives |
Alternatives |
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Categories |
Categories |
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PCB Design Features
3D Visualization
Supported
Autorouting
Supported
Collaboration Tools
Supported
Component Library
Supported
Design Rule Check
Supported
Differential Pair Routing
Not Supported
Schematic Editor
Supported
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PCB Design Features
3D Visualization
Supported
Autorouting
Not Supported
Collaboration Tools
Supported
Component Library
Supported
Design Rule Check
Supported
Differential Pair Routing
Not Supported
Schematic Editor
Supported
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Integrations
KiCad EDA
Not Supported
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