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Entertainment · head to head

Castro vs Synthesia

Castro logo

Castro

Entertainment

Podcast app with episode inbox

From
Free
Rated
-
Full reviewWebsite
Synthesia logo

Synthesia

Video Production

AI video creation with digital presenters

From
Free
Rated
-
Full reviewWebsite

The short version

  • Each has a real cost: Castro iOS/Apple-only, no Android support; Synthesia free plan limited to 10 minutes of video per month
  • They diverge on capability: Castro covers Podcast app, Synthesia covers AI avatars.

Where they differ

Only the attributes on which Castro and Synthesia actually diverge.

Attributes where Castro and Synthesia differ
AttributeCastroSynthesia
Pricing modelUnknownfreemium
PlatformsiOS, Apple Watch, iPadWeb
CategoryEntertainmentVideo Production
Founded20132017

Identical on both: starting price (Free), free tier (Yes), user rating (Not yet rated).

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 Synthesia

  • AI avatars
  • 140+ languages
  • Video templates
  • Brand customization
  • API access
  • LMS integrations
  • PowerPoint
  • Api support

Both cover

  • Web support

What people use each for

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

Castro

  • Podcast managementnot Synthesia
  • Listeningnot Synthesia

Synthesia

  • Training video creation with AI avatarsnot Castro
  • Multilingual video localisation with AI dubbingnot Castro
  • Enterprise video production and managementnot 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

Synthesia

  • Free plan limited to 10 minutes of video per month
  • Starter plan limited to 10 minutes of video per month
  • Creator plan capped at 30 minutes of video per month
  • SSO/SAML authentication restricted to Enterprise tier

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

Synthesia

Free
  • BasicFree
    • 1,200 credits per month
    • Up to 10 minutes of video per month
    • 9 AI avatars
  • Starter$29/month
    • 14,500 credits per year
    • Up to 120 minutes of video per year
    • 125+ AI avatars
  • Creator$89/month
    • 44,000 credits per year
    • Up to 360 minutes of video per year
    • 180+ AI avatars

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 Synthesia if

  • You need ai avatars.
  • You want to start without paying.
  • You also want 140+ languages.
Synthesia review

Questions people ask

Is Castro or Synthesia better?
Neither clearly leads. Castro starts at Free and Synthesia at Free, and user ratings are close enough to be indistinguishable. Choose on capability and platform support.
Which is cheaper, Castro or Synthesia?
Castro starts at Free and Synthesia at Free.
Does Castro or Synthesia run on more platforms?
Castro runs on iOS, Apple Watch, iPad. Synthesia runs on Web.
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 Synthesia is typically brought in for.
What can Castro do that Synthesia cannot?
Castro covers Podcast app, Inbox system, Triage view, Playback. Synthesia covers AI avatars, 140+ languages, Video templates, Brand customization. Both handle Web support.

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
Synthesia: How much does Synthesia cost?

Synthesia offers a free Basic plan with 10 minutes of video per month, Starter at $29 per month with 120 minutes per year, and Creator at $89 per month with 360 minutes per year. Annual billing provides 38% savings. Enterprise plans are available with custom pricing.

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
Synthesia: What is included in Synthesia's free plan?

The free Basic plan includes 1,200 credits per month (approximately 10 minutes of video), 9 AI avatars, 3 personal avatars, and access to 160+ languages and voices. No credit card is required.

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
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
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