Comparison

Chords Genius vs 421Grid

Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.

Head to head
About

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.

Highlights
  • Chord identification by note entry
  • Close matching chord alternatives
  • Chord sequence suggestions
  • Chord calculator
  • Scale suggestions
  • Audio playback for chords and scales
  • VoiceOver support
Features
Read full description

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.

About

421Grid

Features
Read full description

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

Chords Genius4 screens
421Grid4 screens

Verdict

The call

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

CostPrice · In-app purchases · Ads · Monetization

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.

UpkeepUpdate frequency

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.

Scorecard4 real differences · 6 level
Chords Genius versus 421Grid: the parameters behind the verdict, then further details
ParameterChords Genius421Grid
PriceFree — better$1.99
Rating3.7 (3 ratings) — better—
Positive reviews0.0% of reviews—
Number of ratings3 — better—
Update frequencyEvery 3 days — betterEvery 3 months
AdsNoNo
In-app purchasesYesNo — better
MonetizationFree with in-app purchases—
DevicesiPhone, iPad, iPod — betteriPhone, iPad
Requires iOS9.3 — better18.0
Further details — not scored
Size24 MB4 MB
Age rating4+4+
DeveloperFelix MoodN. Wheeler

In-app purchases

1 purchases

Chords Genius

One-time1
  • Upgrade$1.99
None

421Grid

No in-app purchases

Questions

Is Chords Genius free?
Chords Genius is free to download, with in-app purchases available.
Is 421Grid free?
421Grid costs $1.99, with no in-app purchases.
Do Chords Genius or 421Grid have ads?
Neither Chords Genius nor 421Grid shows ads.
Which is updated more often, Chords Genius or 421Grid?
Chords Genius ships an update every 3 days, and 421Grid every 3 months. Most recently, Chords Genius was updated on November 6, 2026 and 421Grid on October 30, 2026.

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