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Podcasting · head to head

Castmagic vs Postscript

Castmagic logo

Castmagic

Podcasting

AI-powered podcast content generation

From
Free
Rated
-
Full reviewWebsite
Postscript logo

Postscript

Marketing

SMS marketing built for Shopify merchants, with carrier fees billed on top of message rates

From
$49/month
Rated
-
Full reviewWebsite

The short version

  • Only Castmagic has a free tier, so it costs nothing to try first.
  • Each has a real cost: Castmagic free plan limited to 3 files per month; Postscript carrier pass-through fees are billed on top of the per-message rate, roughly $0.00418 per SMS and $0.00841 per MMS in the United States, and are routinely missing from the cost comparisons buyers build.
  • They diverge on capability: Castmagic covers AI transcription, Postscript covers Shopify segmentation.
  • Prices and features above were last checked on 31 August 2026.

Where they differ

Only the attributes on which Castmagic and Postscript actually diverge.

Attributes where Castmagic and Postscript differ
AttributeCastmagicPostscript
Starting priceFree$49/month
Pricing modelUnknownPer month plus per message sent
Free tierYesNo
PlatformsWebWeb, iOS
CategoryPodcastingMarketing
Founded2022Unknown

Identical on both: 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 Castmagic

  • AI transcription
  • Show notes generation
  • Social media content
  • Blog article creation
  • Quote extraction
  • RSS feeds
  • Google Drive
  • Dropbox

Only in Postscript

  • Shopify segmentation
  • Automated flows
  • Subscriber acquisition
  • Two-way conversations
  • MMS campaigns
  • Revenue attribution
  • Headless SDK
  • Usage-based tiers

What people use each for

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

Castmagic

  • Content generationnot Postscript
  • Show notes creationnot Postscript
  • Social media marketingnot Postscript

Postscript

  • A Shopify direct-to-consumer brand that wants abandoned cart recovery by text rather than another email in an ignored inboxnot Castmagic
  • A brand running a product drop where a timed broadcast to an opted-in list is the whole launch mechanismnot Castmagic
  • A merchant segmenting by past purchase and variant to send replenishment reminders at the right intervalnot Castmagic
  • A store on headless Shopify or a custom stack that still wants SMS built on order data through the SDKnot Castmagic

Where each one falls short

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

Castmagic

  • Free plan limited to 3 files per month
  • Pricing based on audio hours consumed
  • Not a full podcast hosting solution

Postscript

  • Carrier pass-through fees are billed on top of the per-message rate, roughly $0.00418 per SMS and $0.00841 per MMS in the United States, and are routinely missing from the cost comparisons buyers build.
  • The cheapest per-message rates require the $500 a month plan, so a small sender pays more than double the headline low rate per text.
  • The $0 Starter plan carries a $49 minimum monthly spend, so it is not a free tier and quiet months still generate a bill.
  • US SMS marketing carries real legal exposure under consent, quiet hours and carrier registration rules, and the compliance obligation sits with the merchant, not the platform.
  • It is SMS and MMS only, so email, push and on-site messaging live in a separate tool and audience suppression between the two has to be managed across systems.

Pricing, plan by plan

Castmagic

Free
  • FreeFree
    • 3 files per month
    • AI transcription
    • Basic content generation
  • Starter$39/month
    • 40 hours audio per month
    • All generation formats
    • 60+ language support
  • Pro$99/month
    • 100 hours audio per month
    • Priority support
  • Business$295/month
    • Unlimited content generation
    • API access
    • Team collaboration

Postscript

$49/month
  • Starter$49/month
    • $0 base fee but a $49 minimum monthly spend
    • SMS at $0.015 and MMS at $0.045 per message
    • Campaigns, automations, acquisition tools and analytics
  • Growth$100/month
    • Lower per-message rates than Starter
    • Full campaign and automation feature set
    • No contract required
  • Professional$500/month
    • Rates falling towards $0.007 SMS and $0.024 MMS
    • Suited to high-volume senders
    • Upgrade or downgrade at any time
  • Enterprise$undefined/month
    • Custom pricing on a contract
    • Negotiated message rates and support terms

Which should you pick?

Choose Castmagic if

  • You need ai transcription.
  • You want to start without paying.
  • You also want show notes generation.
Castmagic review

Choose Postscript if

  • You need shopify segmentation.
  • You work on Web, iOS.
  • You also want automated flows.
Postscript review

Questions people ask

Is Castmagic or Postscript better?
Neither clearly leads. Castmagic starts at Free and Postscript at $49/month, and user ratings are close enough to be indistinguishable. Choose on capability and platform support.
Which is cheaper, Castmagic or Postscript?
Castmagic has a free tier; the other does not. Paid plans start at Free for Castmagic and $49/month for Postscript.
Does Castmagic or Postscript run on more platforms?
Castmagic runs on Web. Postscript runs on Web, iOS.
Can I use Castmagic for free?
Yes. Castmagic has a free tier, so you can try it without paying. Postscript starts at $49/month.
What is Castmagic best used for?
Castmagic is most often used for content generation, show notes creation, social media marketing. Of those, content generation and show notes creation are not what Postscript is typically brought in for.
What can Castmagic do that Postscript cannot?
Castmagic covers AI transcription, Show notes generation, Social media content, Blog article creation. Postscript covers Shopify segmentation, Automated flows, Subscriber acquisition, Two-way conversations.

Answered from the vendors’ own pages

Castmagic: What does Castmagic do?

Castmagic is an AI-powered content operating system that transforms audio and video files into show notes, blog articles, social media posts, newsletters, and other content formats automatically.

Source
Postscript: Is Postscript only for Shopify?

It is built for Shopify and that is where its segmentation advantage lies, but headless and non-Shopify stores are supported through an SDK with more setup work.

Castmagic: How much does Castmagic cost?

Castmagic offers a free plan (3 files/month), Starter at $39/month (40 hours audio/month), Pro at $99/month (100 hours audio/month), and Business at $295/month with API and team features.

Source
Postscript: What is the real cost per text?

The plan rate plus carrier fees. On Starter that is about $0.015 plus roughly $0.00418 in US carrier fees per SMS, so budget close to two cents a message before discounts.

Castmagic: What languages does Castmagic support?

Castmagic handles multilingual transcription in 60+ languages with timestamps and speaker detection on all plans.

Source
Postscript: Is the Starter plan free?

No. The base fee is $0 but there is a $49 minimum monthly spend, so it functions as a $49 floor.

Postscript: Do I need a contract?

No. Contracts are offered but not required, and plans can be moved up or down at any time under usage-based billing.

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