NodMusicScore vs Chord Invaders
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
NodMusicScore
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Turn pages for Music Scores & PDFs Hands-Free Keep your hands on your instrument, in your cooking bowl, or busy with work while effortlessly navigating through your documents. This app uses advanced face tracking to turn pages with simple head movements and facial gestures—no touching required. Perfect For: • Musicians reading sheet music during practice or performance • Chefs following recipes with messy hands • Students reviewing study materials while taking notes • Anyone multitasking with hands-free document navigation Powerful Gesture Controls: • Turn head left to go forward • Turn head right to go back • Move lips left or right for page navigation • Customizable sensitivity for your comfort • Multiple trigger options—use what works best for you Key Features: • Fast, accurate face tracking using ARKit and Vision frameworks • Works with any PDF document • Import files from Files app or iCloud • Full-screen viewing optimized for iPad • Adjustable gesture sensitivity and debounce settings • Mirror mode for natural left/right controls • Clean, distraction-free interface • Privacy-first: all processing happens on your device How It Works: Simply load your PDF, position your device, and use natural head or facial movements to navigate. The app instantly responds to your gestures, keeping your workflow smooth and your hands completely free. Device Requirements: • Best experience on devices with TrueDepth camera (iPhone X and later, iPad Pro) • Works on all iOS devices with front camera using Vision fallback • iOS 15.0 or later Transform the way you read documents. Download now and experience true hands-free navigation.
Chord Invaders
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Chord Invaders is a chord-detection game for acoustic and electric guitar. Chord names fall from the top of the screen — play the chord on your real guitar before it reaches the bottom and watch it explode. The app listens through your iPhone's microphone and recognizes what you play in real time. Hit chords earn points. Missed chords cost lives. SEVEN LEVELS, ORGANIZED BY KEY • Level 1: G major (G, C, D) • Level 2: G expanded (adds Em) • Level 3: C major (introduces F) • Level 4: D major (introduces Bm barre) • Level 5: E major blues (A, E, B7, C#m) • Level 6: Mixed minor keys (Am, Dm, E, F, G, C) • Level 7: Color chords (7ths, sus chords, Cadd9) PER-CHORD FEEDBACK After each session, see your accuracy per chord, average reaction time, and a personalized recommendation telling you what to practice next. CHORD DIAGRAMS Every level shows the chord shapes — finger positions, frets, and barre lines — alongside a short note on the music theory behind why those chords are grouped. BUILT-IN TUNER A vertical-bar guitar tuner helps you get in tune before you play. PRIVACY No accounts, no logins, no analytics. Audio is processed entirely on your device and never recorded or transmitted.
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Verdict
The clearest difference is in-app purchases: NodMusicScore at none against Chord Invaders's 1. Chord Invaders's advantage is iOS requirement (15.0 vs 18.5). On price, ads and device support 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. Chord Invaders sells 1 one-off in-app purchase. NodMusicScore asks for nothing beyond the download.
| Parameter | NodMusicScore | Chord Invaders |
|---|---|---|
| Price | Free | Free |
| Update frequency | — | Every 4 days |
| Ads | No | No |
| In-app purchases | No — better | Yes |
| Devices | iPhone, iPad | iPhone, iPad, iPod — better |
| Requires iOS | 18.5 | 15.0 — better |
| Further details — not scored | ||
| Size | 17 MB | 2 MB |
| Age rating | 4+ | 4+ |
| Developer | Bowen Chang pty ltd | Neerav Mehta |
In-app purchases
NodMusicScore
No in-app purchases
Chord Invaders
- Unlock All Levels$1.99
Questions
Is NodMusicScore free?
Is Chord Invaders free?
Do NodMusicScore or Chord Invaders have ads?
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