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Design · head to head

Linearity Curve vs ProtoPie

Linearity Curve logo

Linearity Curve

Design

Professional vector design for Mac and iPad

From
Free
Rated
-
Full reviewWebsite
ProtoPie logo

ProtoPie

Design

Create advanced interactive prototypes

From
Free
Rated
-
Full reviewWebsite

The short version

  • Each has a real cost: Linearity Curve limited to Apple ecosystem (Mac, iPad, iPhone) with no Windows or Linux support; ProtoPie the free plan allows 2 prototypes, 8 scenes per prototype and 50MB of cloud storage
  • They diverge on capability: Linearity Curve covers Vector editing, ProtoPie covers Interactive prototyping.
  • Prices and features above were last checked on 30 August 2026.

Where they differ

Only the attributes on which Linearity Curve and ProtoPie actually diverge.

Attributes where Linearity Curve and ProtoPie differ
AttributeLinearity CurveProtoPie
Pricing modelUnknownfreemium
PlatformsMac, IosWindows, Macos, Web, Ios, Android
Founded20172013

Identical on both: starting price (Free), free tier (Yes), 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 Linearity Curve

  • Vector editing
  • Auto Trace
  • Typography tools
  • Pen tool
  • iCloud sync
  • Adobe Creative Cloud
  • iCloud encryption
  • Data protection

Only in ProtoPie

  • Interactive prototyping
  • Data binding
  • Advanced interactions
  • Animation
  • Collaboration
  • Cloud sharing
  • Device testing
  • Code export

Both cover

  • Sketch
  • Figma

What people use each for

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

Linearity Curve

  • Vector illustrationnot ProtoPie
  • Logo designnot ProtoPie
  • UI designnot ProtoPie
  • Print designnot ProtoPie

ProtoPie

  • Interactive prototype designnot Linearity Curve
  • User testing and handoff managementnot Linearity Curve
  • Team design collaborationnot Linearity Curve

Where each one falls short

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

Linearity Curve

  • Limited to Apple ecosystem (Mac, iPad, iPhone) with no Windows or Linux support
  • Requires annual or monthly subscription for commercial use, unlike competitors offering lifetime purchase options
  • Free plan is severely limited to only 3 Curve files and 5GB storage

ProtoPie

  • The free plan allows 2 prototypes, 8 scenes per prototype and 50MB of cloud storage
  • Free prototypes carry a watermark and shareable links require the Basic plan
  • Saving prototypes locally requires the Pro plan
  • Team libraries and handoff recordings require the Pro plan
  • Basic caps storage at 500MB and prototypes at 20
  • Single sign on, private servers, custom fonts and custom hardware integrations are Enterprise only
  • Enterprise requires a minimum of 3 seats and is priced by quote
  • Connect Core is a paid add on at $20 per user per month

Pricing, plan by plan

Linearity Curve

Free
  • StarterFree
    • 50 lifetime credits
    • 3 Curve files
    • 5GB storage
  • Pro$11.99/month
    • 250 monthly credits
    • Unlimited files
    • 100GB storage
  • Business$65/month
    • 500 monthly credits
    • 500GB storage
    • Brand management

ProtoPie

Free
  • FreeFree
    • 2 prototypes
    • 8 scenes per prototype
    • 50MB cloud storage
  • Basic$25/month
    • 20 prototypes
    • 10 scenes per prototype
    • 500MB storage
  • Pro$47/month
    • Unlimited prototypes
    • Unlimited handoff recordings
    • 5GB team storage

Which should you pick?

Choose Linearity Curve if

  • You need vector editing.
  • You want to start without paying.
  • You work on Mac, Ios.
  • You also want auto trace.
Linearity Curve review

Choose ProtoPie if

  • You need interactive prototyping.
  • You want to start without paying.
  • You work on Windows, Macos, Web, Ios, Android.
  • You also want data binding.
ProtoPie review

Questions people ask

Is Linearity Curve or ProtoPie better?
Neither clearly leads. Linearity Curve starts at Free and ProtoPie at Free, and user ratings are close enough to be indistinguishable. Choose on capability and platform support.
Which is cheaper, Linearity Curve or ProtoPie?
Linearity Curve starts at Free and ProtoPie at Free.
Does Linearity Curve or ProtoPie run on more platforms?
Linearity Curve runs on Mac, Ios. ProtoPie runs on Windows, Macos, Web, Ios, Android.
Can I use Linearity Curve for free?
Both have a free tier, so you can try either at no cost before committing.
What is Linearity Curve best used for?
Linearity Curve is most often used for vector illustration, logo design, ui design, print design. Of those, vector illustration and logo design are not what ProtoPie is typically brought in for.
What can Linearity Curve do that ProtoPie cannot?
Linearity Curve covers Vector editing, Auto Trace, Typography tools, Pen tool. ProtoPie covers Interactive prototyping, Data binding, Advanced interactions, Animation. Both handle Sketch, Figma.

Answered from the vendors’ own pages

Linearity Curve: Does Linearity Curve have a free plan?

Yes, Linearity offers a free Starter plan with 50 lifetime credits, 1 basic brand kit, and 5GB cloud storage. No credit card is required to access the free tier.

Source
ProtoPie: How much does ProtoPie cost?

ProtoPie offers a free plan ($0/month), Basic at $25/month, and Pro at $47/month per editor. Annual billing offers up to 26% savings. Enterprise pricing is custom for minimum 3 seats.

Source
Linearity Curve: Can I use Linearity Curve on multiple devices?

Yes, Linearity Curve is available on Mac, iPad, and iPhone, with real-time collaboration allowing teams to see changes instantly across devices.

Source
ProtoPie: Is there a free version of ProtoPie?

Yes. The free plan includes 2 prototypes, 8 scenes per prototype, and 50MB cloud storage. Perfect for trying the platform.

Source
Linearity Curve: What file formats can I export from Linearity Curve?

Linearity Curve supports exporting to industry-standard formats including .ai, SVG, PDF, PNG, JPG, and TIFF, making it compatible with other design tools.

Source
ProtoPie: What is included in the Pro plan?

Pro plan at $47/month includes unlimited prototypes, unlimited handoff recordings, 5GB team storage, local saving, and team libraries per editor.

Source
Linearity Curve: Does Linearity Curve have AI-powered vectorization?

Yes, Linearity Curve includes an Auto Trace feature with three modes (Sketch, Photography, Illustration) that uses AI to instantly vectorize images into editable paths. It also includes AI-powered background removal.

Source
ProtoPie: What add-on products does ProtoPie offer?

Connect Core ($20/month per user), Connect Enterprise and Connect Embedded (custom pricing), and User Testing (custom pricing, annual-only for Pro plan users).

Source
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