Luna Lines vs Understudy
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Luna Lines
This app helps actors memorize lines by turning scripts into interactive rehearsal partners. Record scenes, mark your part, and practice with generated voices or your own recordings. Scripts are available offline and can be organized in a library.
- Record and rehearse scripts
- Mark lines as 'Me' or 'Them'
- Practice with repetition patterns
- Offline script access
- Organize scripts in a library
- Generate character voices (Pro)
- Share scripts across devices
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Learn your lines by hearing them. Luna Lines turns any script into a rehearsal partner: record the scene, mark your part, and practice with space to say every line out loud. RECORD AND REHEARSE FOR FREE No account needed. Record your lines and your scene partners' lines in your own voice, then mark each one as Me or Them. Pick a repetition pattern, and Luna Lines plays the other characters and leaves a pause for Your Turn. Unlimited lines, always free. ALWAYS KNOW YOUR CUE The now-playing cue shows who's speaking and lights up when it's your turn. Rehearsals play like music, so you can run lines from the Lock Screen, AirPods, Apple Watch or CarPlay. YOUR SCRIPTS, READY OFFLINE Keep every script organized in a library with folders, right on your iPhone. Practice with saved scripts and recordings without a connection, and read comfortably with larger text, dark mode and your character highlighted. A SCENE PARTNER WHENEVER YOU NEED ONE With Pro, generate voices for the other characters and give them their lines in moments, so you can rehearse even when no one is around to read with you. LUNA LINES PRO For actors who want to go further, and a way to support our small team. Pro requires an account and is available as a monthly or yearly subscription. • Turn PDFs, photos and paper scripts into editable lines. Luna Lines finds the scenes and characters for you. • Generate voices for every scene partner. • Export PDFs without a watermark. Scanning and voice generation are unlimited under our fair use policy. Scanned lines are yours to keep. TRY PRO EVERY MONTH Create a free account to get monthly credits for Pro features. Recording and rehearsing stay free, with or without an account. DESIGNED FOR iPHONE DUO Controls move to the side, so your script gets the whole screen. SHARE ACROSS DEVICES Share your scripts across devices and keep practicing wherever you are. From an audition side to opening night, make a little time to run lines every day. Terms of Use: https://lunalines.app/terms Privacy Policy: https://lunalines.app/privacy Say hi: hello@lunalines.app or @appsfromluna on Instagram
Understudy
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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
Screenshots
Verdict
The clearest difference is iOS requirement: Understudy at 14.0 against Luna Lines's 26.0. On price, update cadence, ads and in-app purchases there is nothing between them.
Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS
Both are free to download. Luna Lines sells 2 in-app purchases, starting at $4.99 per month and Understudy sells 5 in-app purchases, starting at $4.99 per month. Whichever you choose, the download price is not the number that matters.
Luna Lines ships an update every 3 weeks, Understudy monthly. The most recent releases landed on November 8, 2026 and October 31, 2026 respectively.
| Parameter | Luna Lines | Understudy |
|---|---|---|
| Price | Free | Free |
| Rating | 3.5 (11 ratings) — better | — |
| Positive reviews | 57.1% of reviews | — |
| Number of ratings | 11 — better | — |
| Update frequency | Every 3 weeks — better | Monthly |
| Ads | No | No |
| In-app purchases | Yes | Yes |
| Monetization | Freemium | — |
| Devices | iPhone, iPad | iPhone, iPod |
| Requires iOS | 26.0 | 14.0 — better |
| Further details — not scored | ||
| Size | 32 MB | 42 MB |
| Age rating | 4+ | 4+ |
| Developer | Luna Technologies Inc. | Shingo Otsuhata |
In-app purchases
Luna Lines
- Lines Pro$4.991 Month
- Lines Pro$19.991 Year
Understudy
- Understudy Pro (Monthly)$4.991 Month
- Understudy Pro (Yearly)$29.991 Year
- Buy me a coffee$0.99
- Add a donut$1.99
- Add a sandwich$3.99









