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Design · head to head

Cadence Allegro vs Zeplin

Cadence Allegro logo

Cadence Allegro

Design

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

From
On request
Rated
-
Full reviewWebsite
Zeplin logo

Zeplin

Design

Design handoff and developer collaboration

From
Free
Rated
-
Full reviewWebsite

The short version

  • Only Zeplin 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.; Zeplin the free plan is limited to 1 project and 100 screens and works only in a personal workspace
  • They diverge on capability: Cadence Allegro covers Constraint Manager, Zeplin covers Design specs.
  • Prices and features above were last checked on 31 August 2026.

Where they differ

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

Attributes where Cadence Allegro and Zeplin differ
AttributeCadence AllegroZeplin
Starting priceOn requestFree
Pricing modelquotesubscription
Free tierNoYes
PlatformsWindows, LinuxWeb, Desktop, Mobile
FoundedUnknown2014

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 Zeplin

  • Design specs
  • Asset export
  • Code snippets
  • Design tokens
  • Comments
  • Version control
  • Handoff workflow
  • Accessibility checks

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 Zeplin
  • A rigid-flex design with multiple stackups that a general-purpose PCB tool cannot represent correctlynot Zeplin
  • A team of PCB designers working concurrently on partitions of one large backplanenot Zeplin
  • An organisation that already runs Sigrity or Clarity analysis and wants the layout constraints and the simulation to share one rule setnot Zeplin

Zeplin

  • Handing off design specs from Figma or Sketch to developersnot Cadence Allegro
  • Sharing screens, assets and style guides with an engineering teamnot Cadence Allegro
  • Reviewing and commenting on design versionsnot 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.

Zeplin

  • The free plan is limited to 1 project and 100 screens and works only in a personal workspace
  • Free plan AI reviews are capped at 3 per week
  • Role based permissions require the Advanced plan or higher
  • Single sign on, multi factor authentication, activity logs and invoiced billing are Enterprise only
  • Priority 24 hour support is Enterprise only
  • Basic plan caps screens at 1,000 per project and is priced per project rather than per seat
  • Enterprise pricing is by quote with no published rate

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

Zeplin

Free
  • FreeFree
    • 1 project
    • 1 workspace
    • Basic specs
  • Starter$19/month
    • Unlimited projects
    • Multiple workspaces
    • Advanced specs
  • Professional$49/month
    • Everything in Starter
    • Team collaboration
    • Admin controls

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 Zeplin if

  • You need design specs.
  • You want to start without paying.
  • You work on Web, Desktop, Mobile.
  • You also want asset export.
Zeplin review

Questions people ask

Is Cadence Allegro or Zeplin better?
Neither clearly leads. Cadence Allegro starts at On request and Zeplin at Free, and user ratings are close enough to be indistinguishable. Choose on capability and platform support.
Which is cheaper, Cadence Allegro or Zeplin?
Zeplin has a free tier; the other does not. Paid plans start at On request for Cadence Allegro and Free for Zeplin.
Does Cadence Allegro or Zeplin run on more platforms?
Cadence Allegro runs on Windows, Linux. Zeplin runs on Web, Desktop, Mobile.
Can I use Zeplin for free?
Yes. Zeplin 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 Zeplin is typically brought in for.
What can Cadence Allegro do that Zeplin cannot?
Cadence Allegro covers Constraint Manager, High-speed routing, Rigid-flex and embedded components, 3D canvas. Zeplin covers Design specs, Asset export, Code snippets, Design tokens.

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.

Zeplin: How much does Zeplin Advanced cost?

Advanced costs $12 per seat per month when paid annually, with annual subscriptions offering 2 months off versus monthly rates.

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.

Zeplin: What's the difference between Free and Basic plans?

Free covers 1 project with 100 screens and 30-day version history. Basic offers 1-12 projects with practically unlimited screens per project and 1-year version history.

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.

Zeplin: Can I add unlimited team members?

Yes, Free and Basic plans allow unlimited team members. Advanced/Enterprise assign roles with Reviewers being free and unlimited.

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.

Zeplin: What can Reviewers do?

Reviewers can view designs and documentation and approve requests, but lack access to developer specs.

Source
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