In active development. Features subject to change.

Stop fighting
the scroll.

Castline is the teleprompter that follows your voice. The page moves when you do. Coming soon to iPhone.

Get notified at launch See how it follows
Castline’s reading screen: large script text with the amber reading line running across it
Follow

Five ways it keeps up.

With Follow on, Castline listens to your pace and matches your words to the script, so the page moves under the amber reading line as you speak.

Talk. It moves.

The page advances only while you’re speaking, at your pace.

Pause. It waits.

Breathe, think, land the line. The script stays put.

Go off script. It holds your place.

Ad-lib as long as you like. Come back and it picks up.

Skip a line. It catches up.

Start a later line and the page scrolls forward to meet you.

Flub a line? Say it again.

Castline comes back with you, without jittery jumps.

Just one amber reading line. No flashing words, nothing extra to track. Your script sits where your eyes need it. Prefer a classic prompter? Set your own scroll speed instead.

Why Follow

A fixed scroll makes you chase it.

Real delivery has pauses, asides and do-overs. Castline is built for all of them.

When you…
Fixed-speed scroll
Castline Follow
Pause for a breath
Keeps scrolling
Waits for you
Go off script
Scrolls past your place
Holds your place
Skip a line
You drag to find it
Catches up
Flub and say it again
You scroll back by hand
Comes back with you
How it works

From script to post, in one app.

Real screens from the current development build. The camera view in step 3 is a mockup.

  1. 01 — Write

    Bring your script.

    Paste in your hook and script, import it, or begin with an AI-written script, then rewrite it in the editor until it sounds like you. When it reads right, tap Read.

    Castline script editor with Paste, Rewrite and Import buttons
  2. 02 — Read or record

    Read it live, or record your take.

    Big, clear text on one amber line. Read from it on a live stream, or hit record and film your next TikTok, Reel or YouTube video. Turn on Follow, or set your own scroll speed and text size.

    Castline reading screen with the amber reading line
  3. 03 — Record

    Practice it. Then record it.

    Run it with the camera off, then record your take while you read, up to 4K. Tap to pause, drag to pick up anywhere.

    Mockup: Castline script over the live front camera while recording
  4. 04 — Post

    Send it everywhere.

    Takes save to Photos. Pick TikTok, Instagram, YouTube and more, and Castline opens each one with your video attached.

    Castline Send this take sheet with TikTok, Instagram and YouTube selected
Features

Built for the take you actually want.

A library for every script

Videos, speaking and reading, each with word counts and read times. Practice scripts included.

Castline script library with Videos, Speaking and Reading tabs

Record while you read

Capture your take with the script on screen, up to 4K, saved straight to Photos.

Classic scrolling

A steady scroll at the words-a-minute you set, with adjustable text size.

Remote control

A Bluetooth keyboard or page-turner, or another iPhone. No internet or account needed.

Rig mode

Mirrored text for teleprompter glass, with controls kept out of the way.

Start from a draft

Paste, import, or begin with an AI-written script, then rewrite until it sounds like you.

Post in seconds

Choose every place you want it. Castline opens each app in turn with your video attached.

Capture stops when you stop.

When the take ends, camera capture ends with it.

A remote that stays local.

The iPhone remote pairs directly between your devices, with no internet or account.

Pricing

Pricing
coming soon.

We’re finalizing plans now. Some features will be part of Castline Plus, an optional upgrade. Join the list and you’ll hear about pricing first.

One email when Castline is ready for iPhone.

Now

Follow, scripts and recording, in active development builds.

Before launch

Plans and pricing, shared with the list first.

Next

Castline launches on iPhone.

Castline is in active development. Features, design and availability shown here are subject to change.

FAQ

Good questions.

When can I get Castline?

Castline is coming soon to iPhone. Join the list and we’ll email you when it’s ready to download.

How does Castline follow my voice?

With Follow on, Castline listens to your pace and matches what you say to your script. The page moves under the amber reading line while you talk and waits when you pause.

What if I ad-lib, skip, or flub a line?

Go off script and Castline holds your place until you come back to your words. Skip a line and it catches up. Say a line again and it comes back with you.

Can I still use a normal scrolling prompter?

Yes. Classic scrolling moves the page at the speed you choose, and you can change the text size, tap to pause, or drag to any line.

Does it work with a remote or teleprompter glass?

Use a Bluetooth keyboard or page-turner, or another iPhone as a remote. Rig mode mirrors your script for teleprompter glass.

How much will it cost?

Pricing is still being finalized. We’ll share plans before launch, and people on the list hear first.

Is anything still changing?

Yes. Castline is in active development, so features and design may change before launch.

Still curious? [email protected] · Need help? Visit Support

The page moves when you do.Coming soon to iPhone.

We’ll only email you about Castline’s launch.