Chords Genius vs 421Grid
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Chords Genius
Identify chords by entering their notes and discover close matches. This tool offers chord sequences, scales, and a calculator to find notes within a chord. Hear chords and scales, with VoiceOver support for accessibility.
- Chord identification by note entry
- Close matching chord alternatives
- Chord sequence suggestions
- Chord calculator
- Scale suggestions
- Audio playback for chords and scales
- VoiceOver support
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What is that chord? Enter the notes in any order and find out what the chord is and any close matching chords. A complete tool for songwriters / musicians. FEATURES Keyboard & guitar interface for easy note entry. * Get close matching chord alternatives. * Offers a variety of chord sequences that go with your chosen chord. * Includes Chord Calculator; enter the name of a chord (e.g. Fm9) and see what notes it comprises. * Get all possible scales that work with your chord. * Hear each chord and scales. * VoiceOver supported.
421Grid
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Turn Practice into Progress. Inspiration into Execution. Whether you’re a drumline veteran, music educator, or aspiring percussionist, this app is your personal drumming lab—designed to help you experiment, customize, and level up your chops with precision. Built for Rudimental Drummers Who Want More Forget flipping through old notebooks or searching YouTube for exercises you can’t customize. With this app, you can build your own practice grids, apply the legendary 4-2-1 structure, and modify exercises using accents, subdivisions (triplets, fivelets, sixteenths), or even alternate stickings—all with just a few taps. Customize Everything Shift the beat. Change the direction. Reverse your sticking. Or layer complexity to push your brain and hands to the limit. Every exercise becomes your own. Designed for Students and Educators Music teachers: Quickly generate custom warmups or technique builders for your drumline. Students: Practice smarter, not just harder—with structured routines and unlimited variations. Why Drummers Are Calling This a Game-Changer: • Reinforces fundamentals through creative repetition • Encourages daily practice through customization and challenge • Perfect for drumline auditions, solo prep, or just sharpening your hands • No internet? No problem. Train anywhere you take your sticks. Ready to Break Through Your Plateaus? This isn’t just another drumming app. It’s your creative practice engine, your daily workout, and your edge over the competition. Download now and redefine your rudimental journey.
Screenshots
Verdict
The clearest difference is price: Chords Genius at Free against 421Grid's $1.99. Chords Genius also leads on update cadence (every 3 days vs every 3 months) and iOS requirement (9.3 vs 18.0). 421Grid's advantage is in-app purchases (none vs 1). On 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
Chords Genius is free to download; 421Grid costs $1.99 up front. Chords Genius sells 1 one-off in-app purchase. 421Grid asks for nothing beyond the download.
Chords Genius ships an update every 3 days, 421Grid every 3 months. The most recent releases landed on November 6, 2026 and October 30, 2026 respectively.
| Parameter | Chords Genius | 421Grid |
|---|---|---|
| Price | Free — better | $1.99 |
| Rating | 3.7 (3 ratings) — better | — |
| Positive reviews | 0.0% of reviews | — |
| Number of ratings | 3 — better | — |
| Update frequency | Every 3 days — better | Every 3 months |
| Ads | No | No |
| In-app purchases | Yes | No — better |
| Monetization | Free with in-app purchases | — |
| Devices | iPhone, iPad, iPod — better | iPhone, iPad |
| Requires iOS | 9.3 — better | 18.0 |
| Further details — not scored | ||
| Size | 24 MB | 4 MB |
| Age rating | 4+ | 4+ |
| Developer | Felix Mood | N. Wheeler |
In-app purchases
Chords Genius
- Upgrade$1.99
421Grid
No in-app purchases









