Softwr

Design · head to head

ProtoPie vs Spline

ProtoPie logo

ProtoPie

Design

Create advanced interactive prototypes

From
Free
Rated
-
Full reviewWebsite
Spline logo

Spline

Design

3D design tool for the web

From
Free
Rated
-
Full reviewWebsite

The short version

  • Each has a real cost: ProtoPie the free plan allows 2 prototypes, 8 scenes per prototype and 50MB of cloud storage; Spline aI generation features produce inconsistent and often distorted results, failing at basic depth perception tasks
  • They diverge on capability: ProtoPie covers Interactive prototyping, Spline covers 3D modeling.
  • Prices and features above were last checked on 30 August 2026.

Where they differ

Only the attributes on which ProtoPie and Spline actually diverge.

Attributes where ProtoPie and Spline differ
AttributeProtoPieSpline
PlatformsWindows, Macos, Web, Ios, AndroidWeb, iOS, Android, visionOS
Founded20132020

Identical on both: starting price (Free), pricing model (freemium), 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 ProtoPie

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

Only in Spline

  • 3D modeling
  • Real-time collaboration
  • Animations
  • Interactions
  • React
  • Next.js
  • Webflow
  • Framer

Both cover

  • Code export

What people use each for

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

ProtoPie

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

Spline

  • Web 3D experiencesnot ProtoPie
  • Interactive prototypesnot ProtoPie
  • Product visualizationnot ProtoPie

Where each one falls short

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

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

Spline

  • AI generation features produce inconsistent and often distorted results, failing at basic depth perception tasks
  • Limited to simpler designs - not suitable for high-poly, detailed production models
  • Performance degrades with complex scenes containing many objects and materials
  • Limited non-Apple platform coverage compared to cross-platform design tools
  • Tutorials are either too fast for beginners or too basic for advanced users

Pricing, plan by plan

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

Spline

Free
  • FreeFree
    • Unlimited projects
    • Basic exports
    • Community support
  • Pro$9/month
    • Advanced exports
    • Custom domains
    • Password protection
  • Team$19/month
    • Team collaboration
    • Version control
    • Admin controls

Which should you pick?

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

Choose Spline if

  • You need 3d modeling.
  • You want to start without paying.
  • You work on Web, iOS, Android, visionOS.
  • You also want real-time collaboration.
Spline review

Questions people ask

Is ProtoPie or Spline better?
Neither clearly leads. ProtoPie starts at Free and Spline at Free, and user ratings are close enough to be indistinguishable. Choose on capability and platform support.
Which is cheaper, ProtoPie or Spline?
ProtoPie starts at Free and Spline at Free.
Does ProtoPie or Spline run on more platforms?
ProtoPie runs on Windows, Macos, Web, Ios, Android. Spline runs on Web, iOS, Android, visionOS.
Can I use ProtoPie for free?
Both have a free tier, so you can try either at no cost before committing.
What is ProtoPie best used for?
ProtoPie is most often used for interactive prototype design, user testing and handoff management, team design collaboration. Of those, interactive prototype design and user testing and handoff management are not what Spline is typically brought in for.
What can ProtoPie do that Spline cannot?
ProtoPie covers Interactive prototyping, Data binding, Advanced interactions, Animation. Spline covers 3D modeling, Real-time collaboration, Animations, Interactions. Both handle Code export.

Answered from the vendors’ own pages

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
Spline: What is Spline's pricing?

Spline offers a Free plan with watermarked web exports, Starter at $12/month (billed annually) removing watermarks, Professional at $20/month with unlimited projects, and Enterprise with custom pricing. Viewers are unlimited on all plans.

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
Spline: Can Spline export 3D models to other tools?

Spline's export/import format support is more limited compared to traditional 3D tools like Blender. It focuses on web-first exports and native app code generation.

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
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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