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Design · head to head

Cadence Allegro vs Subframe

Cadence Allegro logo

Cadence Allegro

Design

High-speed PCB design and constraint-driven routing for complex boards

From
On request
Rated
-
Full reviewWebsite
Subframe logo

Subframe

Design

The AI-native design tool built for code

From
Free
Rated
-
Full reviewWebsite

The short version

  • Only Subframe has a free tier, so it costs nothing to try first.
  • Each has a real cost: Cadence Allegro cadence publishes no prices; resellers quote Allegro X from roughly $5,700 per seat per year on lease or about $18,000 perpetual with support, so the entry cost is several times a mainstream PCB tool and budget approval usually needs a business case.; Subframe free plan limited to 1 project and 10 pages
  • Prices and features above were last checked on 31 August 2026.

Where they differ

Only the attributes on which Cadence Allegro and Subframe actually diverge.

Attributes where Cadence Allegro and Subframe differ
AttributeCadence AllegroSubframe
Starting priceOn requestFree
Pricing modelquotefreemium
Free tierNoYes
PlatformsWindows, LinuxWeb

Identical on both: user rating (Not yet rated), category (Design).

What each one covers

Drawn from each product's published feature list. An absence here means we hold no record of it - not that the product lacks it.

Only in Cadence Allegro

  • Constraint Manager
  • High-speed routing
  • Rigid-flex and embedded components
  • 3D canvas
  • Sigrity integration
  • Team design
  • Manufacturing output

Only in Subframe

Nothing recorded that Cadence Allegro does not also cover.

What people use each for

The jobs each tool is most often brought in to do.

Cadence Allegro

  • Routing a DDR5 or high-speed SerDes board where length matching and impedance rules must be enforced during layout, not checked afterwardsnot Subframe
  • A rigid-flex design with multiple stackups that a general-purpose PCB tool cannot represent correctlynot Subframe
  • A team of PCB designers working concurrently on partitions of one large backplanenot Subframe
  • An organisation that already runs Sigrity or Clarity analysis and wants the layout constraints and the simulation to share one rule setnot Subframe

Subframe

  • Creating production-ready interfaces without static mockupsnot Cadence Allegro
  • Syncing design components with code as single source of truthnot Cadence Allegro
  • Building responsive designs with auto layoutnot Cadence Allegro
  • Real-time multiplayer collaboration with layer commentingnot Cadence Allegro
  • Exporting Radix UI and Tailwind CSS code via CLInot Cadence Allegro

Where each one falls short

Documented limitations, not opinions. Every one is a constraint you would hit in normal use.

Cadence Allegro

  • Cadence publishes no prices; resellers quote Allegro X from roughly $5,700 per seat per year on lease or about $18,000 perpetual with support, so the entry cost is several times a mainstream PCB tool and budget approval usually needs a business case.
  • The learning curve is steep and the interface carries decades of accumulated convention, so a designer coming from another tool needs weeks to become productive and formal training is effectively mandatory.
  • Capability is split across product tiers and add-ons, so the feature you assumed was in Allegro may be an extra SKU, and the quoted configuration deserves a line-by-line check against your actual requirements.
  • Perpetual licences still carry annual maintenance to stay on current releases, and lapsing maintenance means paying to rejoin later, so the perpetual option is only cheaper over a long horizon.
  • Library and part data management is a project in its own right; teams that treat it as an afterthought end up with inconsistent footprints that surface as manufacturing defects rather than design errors.

Subframe

  • Free plan limited to 1 project and 10 pages
  • Free plan includes limited AI features compared to Pro
  • Pro plan billed per editor, not per team

Pricing, plan by plan

Cadence Allegro

On request
  • Allegro X PCB Designer$undefined/year
    • Constraint-driven layout and routing
    • High-speed and rigid-flex support
    • Sold as annual lease or perpetual licence
  • Allegro X Enterprise$undefined/year
    • Team design and concurrent editing
    • Integrated signal and power integrity
    • Data management and library control

Subframe

Free
  • FreeFree
    • 1 project
    • Up to 10 pages
    • 2 prototypes
  • Pro$29/month
    • Unlimited projects
    • Unlimited pages
    • Unlimited prototypes

Which should you pick?

Choose Cadence Allegro if

  • You need constraint manager.
  • You work on Windows, Linux.
  • You also want high-speed routing.
Cadence Allegro review

Choose Subframe if

  • You want to start without paying.
Subframe review

Questions people ask

Is Cadence Allegro or Subframe better?
Neither clearly leads. Cadence Allegro starts at On request and Subframe at Free, and user ratings are close enough to be indistinguishable. Choose on capability and platform support.
Which is cheaper, Cadence Allegro or Subframe?
Subframe has a free tier; the other does not. Paid plans start at On request for Cadence Allegro and Free for Subframe.
Does Cadence Allegro or Subframe run on more platforms?
Cadence Allegro runs on Windows, Linux. Subframe runs on Web.
Can I use Subframe for free?
Yes. Subframe has a free tier, so you can try it without paying. Cadence Allegro starts at On request.
What is Cadence Allegro best used for?
Cadence Allegro is most often used for routing a ddr5 or high-speed serdes board where length matching and impedance rules must be enforced during layout, not checked afterwards, a rigid-flex design with multiple stackups that a general-purpose pcb tool cannot represent correctly, a team of pcb designers working concurrently on partitions of one large backplane, an organisation that already runs sigrity or clarity analysis and wants the layout constraints and the simulation to share one rule set. Of those, routing a ddr5 or high-speed serdes board where length matching and impedance rules must be enforced during layout, not checked afterwards and a rigid-flex design with multiple stackups that a general-purpose pcb tool cannot represent correctly are not what Subframe is typically brought in for.
What can Cadence Allegro do that Subframe cannot?
Cadence Allegro covers Constraint Manager, High-speed routing, Rigid-flex and embedded components, 3D canvas.

Answered from the vendors’ own pages

Cadence Allegro: Can I still buy a perpetual Allegro licence?

Yes. Cadence channel partners quote both annual lease and perpetual licences for Allegro X, with perpetual starting around $18,000 including support. OrCAD X is more commonly sold as lease only.

Subframe: Is there a free version of Subframe?

Yes, Subframe offers a free plan with 1 project, up to 10 pages, 2 prototypes, unlimited team members, and limited AI features.

Source
Cadence Allegro: How does Allegro differ from OrCAD?

OrCAD X is schematic capture and mainstream PCB layout; Allegro X is the high-speed implementation environment with the full constraint manager. They share a database, so moving up does not mean redrawing.

Subframe: How is the Pro plan priced?

Subframe Pro costs $29 per editor per month, with unlimited projects, pages, prototypes, and AI usage.

Source
Cadence Allegro: Is there a free or student version?

Cadence offers time-limited evaluation and academic programmes, but there is no free commercial tier.

Subframe: Are viewer seats free?

Yes, Subframe offers free viewer seats across all pricing plans, allowing team members to view without an editor license.

Source
Cadence Allegro: Do I need Sigrity as well?

Only if you need signal or power integrity simulation. Allegro enforces constraints but does not simulate; Sigrity is a separate purchase.

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