Open Your Podcast Directly in the Castro App

Turn any castro.fm link into a smart link that launches Castro on your show or a specific episode, so a tap from your bio or socials drops iPhone listeners one button away from Subscribe.

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  • Free forever
  • No credit card
  • Works on iPhone & Android

Trusted by 50,000+ creators and marketersBuilt for podcasters whose fans triage in Castro

What Is a Castro Deep Link?

Castro is a distinctive iOS podcast app built around an Inbox-and-Queue workflow that lets meticulous listeners triage each new episode before they commit to it. The hitch: when one of those listeners taps a plain castro.fm link from elsewhere, mobile usually loads a web page first, inserting a step between curiosity and the Subscribe button.

A Castro deep link removes that step. Share a short LinkTwin link rather than a raw castro.fm URL, and a tap on iPhone opens the Castro app directly on your show or the episode you’re promoting, landing the listener right where they can subscribe and send it to their Inbox or Queue in a single tap.

When Castro isn’t installed, the link gracefully opens castro.fm in the browser, so the same link is safe to drop into your Instagram bio, show notes, an email, or a QR code no matter which player each fan favours. One branded short URL, the right app every time, and a full log of every tap.

Why Podcasters Use It

Land in the Castro Inbox, Not a Web Page

Castro listeners decide fast, get your show in front of them in-app before the moment passes.

Straight into Castro

No web-page detour. Listeners land in the Castro app on your show, ready to subscribe in one tap.

Into the Inbox & Queue

Reach Castro fans where they triage, so your new episode is one tap from their listening queue.

One link, every channel

Use the same smart link across bios, posts, and show notes, it routes to the right device on its own.

Know what converts

Built-in analytics reveal which post, channel, or episode actually sends listeners to Castro.

How to Create a Castro Deep Link

From a castro.fm URL to an app-opening, trackable link in about a minute, no code required.

  1. Copy your Castro URL

    Grab the link to your show or a single episode from the Castro share sheet or your browser’s address bar.

  2. Paste it into LinkTwin

    Drop the URL into the generator above. LinkTwin detects the Castro link and prepares the app handoff for you.

  3. Brand your short link

    Use the generated link as-is, or add a custom alias (like /listen) or your own domain for a polished URL.

  4. Share it everywhere

    Add it to your bio, newsletter, and posts. Every tap opens Castro when possible, and every tap is tracked.

Paste a link from any of these addresses and LinkTwin opens it in the Castro app. When the app is not there, the same page opens in the browser, so the link never breaks.

  • castro.fm
  • Opens your show or episode in the Castro app
  • One tap to subscribe and triage it into the Inbox or Queue
  • Falls back to castro.fm in the browser when the app isn’t installed
  • Track clicks by country and device on every link

What happens on each device

  • iPhone or iPad with the Castro app Opens in the Castro app
  • Android phone Opens the same page in the browser
  • A phone without the Castro app Opens the same page in the browser
  • A computer Opens the same page in the browser

Castro has no Android app, so Android visitors get the web page.

TikTok never lets a link out on its own, so LinkTwin shows a short guide to TikTok's own Open in browser, two taps away. On X, it takes one tap on iPhone, and app links open directly on Android. If an app is not installed, the visitor gets the normal web page.

Ways Podcasters Use Castro Deep Links

However you promote your show, a deep link gets Castro fans to Subscribe faster.

Episode drops

Share one link when an episode lands; Castro fans tap once and triage it straight into their Inbox.

Subscribe pushes

Run an “add me on Castro” campaign and measure which channel converts the most listeners.

Link-in-bio

Send your social audiences into the Castro app from a single, trackable bio link.

Multi-app menus

List this next to your other player links so each listener opens the app they actually use.

Analytics

Castro Link Tracking for Creators

Castro gives hosts no per-link analytics, so a tracked LinkTwin link is the clearest way to see what your promotion drives.

  • Real-time clicksWatch total and unique clicks update live as listeners tap your Castro links.
  • Geo & deviceBreak clicks down by country and device to understand where your Castro audience comes from.
  • Channel attributionTag each link with UTM parameters to learn which platform sends the most subscribers.
  • Retargeting pixelsAdd Meta, Google, TikTok or X pixels to retarget everyone who clicked toward your podcast.

See how click analytics works

Castro Deep Links: Frequently Asked Questions

Still wondering about something? Ask us directly.

How do I make my Castro link open in the app?

Paste your castro.fm show or episode URL into LinkTwin and share the short link it gives you. On an iPhone with Castro installed, the link opens the app directly on that page, where listeners can subscribe and triage in one tap. Without the app, it opens castro.fm in the browser instead, all handled automatically.

Can I deep link to one episode instead of my whole show?

Yes. LinkTwin supports both show-level and individual episode links. Each opens in the correct place inside the Castro app, with a web fallback if the app isn’t installed, so you can promote a specific episode the instant it publishes.

What happens for Android listeners or on desktop?

Castro is an iOS-only app, so on Android and desktop the LinkTwin link simply opens the castro.fm web page in the browser. You still share a single link, it sends iPhone fans into the app and routes everyone else somewhere sensible.

Can I track how many listeners clicked my Castro link?

Absolutely. Every LinkTwin link records total clicks, unique clicks, country, device and referrer in real time. You can also add UTM tags or retargeting pixels, which is handy since Castro doesn’t tell you which post or channel a tap came from.

Is the Castro deep link generator free?

Yes. LinkTwin includes a free-forever plan with 10 links and 500 clicks a month, ideal for getting started. You only upgrade if you need a custom domain, more clicks, or advanced features like A/B testing and retargeting. No credit card required.

Every app below has its own page, and the same link opens each one in its own app.

Turn Taps Into Subscribers

Create a free Castro deep link that opens your show in the app and tracks every click.

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