Understudy: Learn Your Lines
Record lines, practice alone
Only for iPhone
Free · In‑App Purchases · Designed for iPhone. Not verified for macOS.
iPhone
Record your scene partner's lines, then practice the back-and-forth on your own.
◆ Who it's for
Actors, voice actors, comedians, presenters — anyone who has to learn lines and then perform in front of people. Professional or not.
◆ How it works
1. Record your scene partner's lines
2. On the practice screen, play them back and say your own lines out loud
3. Tap to play. The app moves to the next line for you
◆ What you can do
Work without looking at the screen
Tap and swipe are all you need, so you can move around and keep your eyes up. Every action comes back as a small vibration.
Change the playback speed
From 0.5x to 2.0x. Slow it down to check a passage, or speed it up for a quick run-through.
Attach a PDF script
Link a PDF to a work and read it while you record. The file stays on your device — Understudy only points to it, so nothing is uploaded anywhere.
Add bookmarks and jump to a page in one tap.
Bring in audio you already have
Import music or any audio file you've prepared. Useful when you practice against a sound cue.
Export your recordings and share them
Export a scene as a ZIP. Move it to another device, or hand it to the person you're working with. You can also practice against a ZIP someone else recorded, with their voice as your scene partner.
◆ From the developer
At home, on the way to rehearsal, or in the hour before a performance — I wanted something I could practice with anywhere.
That's why I made this. I hope it helps you.
◆ About Understudy Pro
Everything you need to practice stays free. With Understudy Pro you can see more of your data on the Practice Ticket and choose from all 7 ticket designs. You also get the Pro colors, and you can set a color of your own.
Understudy Pro is an auto-renewing subscription, available monthly or yearly. It renews at the same price unless you cancel at least 24 hours before the current period ends. You can cancel any time from Manage subscription in the app.
Terms of Use (EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/
Privacy Policy: https://shimeco.github.io/understudy-pages/privacy.html
Ratings & Reviews
- This app hasn’t received enough ratings or reviews to display an overview.
▼ 1.4.1
Small fixes.
▼ 1.4.0
Understudy is now in English
Record your scene partner's lines, then practice the back-and-forth on your own. Tap and swipe are all you need, so you can practice without looking at the screen. Change the playback speed, keep a PDF script beside you, and bring in audio you already have.
The app follows your device language.
Understudy Pro is here
• Practice Ticket
Look back on your practice, and save or share it as a ticket. You can issue one for free. With Pro you can see more of your data, and choose from all 7 ticket designs. I'm happy with how they turned out — have a look.
• Pro colors and custom color
You get the 5 Pro colors, and you can set a color of your own.
Good to know
Everything you need to practice stays free. All of it. That won't change.
Understudy Pro is for when you want to make the app more your own.
Every screen has also been reworked, so the app stays usable at larger text sizes.
The developer, Shingo Otsuhata, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy .
Data Not Linked to You
The following data may be collected but it is not linked to your identity:
- Usage Data
- Diagnostics
Accessibility
The developer has not yet indicated which accessibility features this app supports. Learn More
Information
- Seller
- Shingo Otsuhata
- Size
- 43.8 MB
- Category
- Productivity
- Compatibility
Requires iOS 14.0 or later.
- iPhone
Requires iOS 14.0 or later. - iPod touch
Requires iOS 14.0 or later. - Mac
Requires macOS 11.0 or later and a Mac with Apple M1 chip or later. - Apple Vision
Requires visionOS 1.0 or later.
- iPhone
- Languages
- English and Japanese
- Age Rating
4+
- 4+
- In-App Purchases
Yes
- Understudy Pro (Yearly) $29.99
- Understudy Pro (Monthly) $4.99
- Add a donut $1.99
- Add a sandwich $3.99
- Buy me a coffee $0.99
- Copyright
- © 2026 Understudy Project