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Castro vs Unreal Engine

Castro logo

Castro

Entertainment

Podcast app with episode inbox

From
Free
Rated
-
Full reviewWebsite
Unreal Engine logo

Unreal Engine

Entertainment

The world's most open and advanced real-time 3D creation tool

From
Free
Rated
-
Full reviewWebsite

The short version

  • Each has a real cost: Castro iOS/Apple-only, no Android support; Unreal Engine 5% royalty triggered on any project exceeding $1 million in gross revenue across all revenue sources
  • They diverge on capability: Castro covers Podcast app, Unreal Engine covers Real-time ray tracing.
  • Prices and features above were last checked on 30 August 2026.

Where they differ

Only the attributes on which Castro and Unreal Engine actually diverge.

Attributes where Castro and Unreal Engine differ
AttributeCastroUnreal Engine
PlatformsiOS, Apple Watch, iPadPC, macOS, Linux, PlayStation, Xbox, Nintendo Switch, iOS, Android, VR, AR
Founded20131991

Identical on both: starting price (Free), pricing model (Unknown), free tier (Yes), user rating (Not yet rated), category (Entertainment).

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 Castro

  • Podcast app
  • Inbox system
  • Triage view
  • Playback
  • Discovery
  • Podcast services
  • Apple services
  • Account security

Only in Unreal Engine

  • Real-time ray tracing
  • Nanite geometry
  • Lumen global illumination
  • Blueprint visual scripting
  • C++ programming
  • World composition
  • Animation systems
  • Audio engine

What people use each for

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

Castro

  • Podcast managementnot Unreal Engine
  • Listeningnot Unreal Engine

Unreal Engine

  • AAA game developmentnot Castro
  • Indie game creationnot Castro
  • Architectural visualizationnot Castro
  • Film and TV productionnot Castro
  • VR/AR experiencesnot Castro

Where each one falls short

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

Castro

  • iOS/Apple-only, no Android support
  • No unified inbox for managing multiple podcast accounts
  • Recent ownership change (2024) may affect long-term development

Unreal Engine

  • 5% royalty triggered on any project exceeding $1 million in gross revenue across all revenue sources
  • Smaller mobile game ecosystem compared to Unity, with fewer optimized mobile libraries and live-ops services

Pricing, plan by plan

Castro

Free
  • FreeFree
    • Core podcast management
    • Inbox/queue/archive
    • CarPlay support
  • Castro Plus$24.99/year
    • Custom per-podcast settings
    • Trim Silence
    • Enhance Voices

Unreal Engine

Free
  • Game DevelopmentFree
    • Nanite geometry
    • Lumen global illumination
    • Blueprint visual scripting
  • Non-Game Commercial$1850/year
    • No royalties
    • Enterprise features

Which should you pick?

Choose Castro if

  • You need podcast app.
  • You want to start without paying.
  • You work on iOS, Apple Watch, iPad.
  • You also want inbox system.
Castro review

Choose Unreal Engine if

  • You need real-time ray tracing.
  • You want to start without paying.
  • You work on PC, macOS, Linux, PlayStation, Xbox, Nintendo Switch, iOS, Android, VR, AR.
  • You also want nanite geometry.
Unreal Engine review

Questions people ask

Is Castro or Unreal Engine better?
Neither clearly leads. Castro starts at Free and Unreal Engine at Free, and user ratings are close enough to be indistinguishable. Choose on capability and platform support.
Which is cheaper, Castro or Unreal Engine?
Castro starts at Free and Unreal Engine at Free.
Does Castro or Unreal Engine run on more platforms?
Castro runs on iOS, Apple Watch, iPad. Unreal Engine runs on PC, macOS, Linux, PlayStation, Xbox, Nintendo Switch, iOS, Android, VR, AR.
Can I use Castro for free?
Both have a free tier, so you can try either at no cost before committing.
What is Castro best used for?
Castro is most often used for podcast management, listening. Of those, podcast management and listening are not what Unreal Engine is typically brought in for.
What can Castro do that Unreal Engine cannot?
Castro covers Podcast app, Inbox system, Triage view, Playback. Unreal Engine covers Real-time ray tracing, Nanite geometry, Lumen global illumination, Blueprint visual scripting.

Answered from the vendors’ own pages

Castro: How much does Castro cost?

Castro 3 is free to download with optional Castro Plus subscription at $24.99/year (includes one-week free trial).

Source
Unreal Engine: What is Unreal Engine's royalty structure?

Unreal Engine is free upfront with a 5% royalty on gross revenue worldwide after a project exceeds $1 million in lifetime gross revenue. This includes in-app purchases, advertising, and direct sales but excludes indirect revenue.

Source
Castro: What platforms does Castro support?

Castro is available on iPhone with an Apple Watch app and is expanding to iPad (launched August 4, 2025). There is no Android version.

Source
Unreal Engine: What platforms can Unreal Engine target?

Unreal Engine supports PC, VR, AR, gaming consoles, and mobile devices. The royalty fee applies across all platforms.

Source
Castro: What are the key features of Castro Plus premium subscription?

Castro Plus adds custom per-podcast settings including Episode Limit, Trim Silence, Enhance Voices, Mono Mix, Skip Intros, and variable playback speed.

Source
Unreal Engine: What are Unreal Engine's graphics capabilities?

Unreal Engine 5 features Nanite virtualized geometry and Lumen global illumination, enabling photorealistic AAA workflows. Nanite replaces traditional LOD systems with 128-triangle clusters and software rasterization for superior visual fidelity.

Source
Castro: How does Castro organize podcasts?

Castro uses an inbox/queue/archive split system where the inbox contains notifications of new episodes and the queue serves as an active playlist.

Source
Unreal Engine: Do non-game developers pay royalties?

No. Non-game commercial teams pay $1,850 per seat per year instead of royalties. This covers enterprise use cases outside traditional game development.

Source
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