Appworthy

Chord Destroyer

Music theory arcade for guitar

EggBag
Download on theApp Store
App Store rating5.0★1 rating
PriceFreeIn-app $0.99
Age4+Store age rating
Size32 MBiPhone download
CategoryGames
DeveloperEggBag

What we found

Full report

Too little checked to say Store information only. We haven’t analysed this app or read its reviews yet.

Money

  • Free to download · in-app purchases $0.99 (1 listed). The store doesn’t say how often these bill.
  • If you subscribe through the store, cancel in iPhone Settings → your name → Subscriptions. Deleting the app doesn’t cancel a subscription.

Not yet tested.

The store currently lists version 1.4, updated 2026-09-19.

Preview

Screenshot 1Screenshot 2Screenshot 3Screenshot 4Screenshot 5Screenshot 6Screenshot 7Screenshot 8

Store screenshots supplied by the developer.

About this app

Alien amp stacks are descending. Each one wears a Roman numeral on its grille, and only one thing can destroy it: the chord that numeral names in the key you are in.

Chord Destroyer takes the part of music theory everyone skips, diatonic harmony, and turns it into an arcade game you can actually finish. Fly the guitar, read the numeral, fire the right notes.

HOW IT PLAYS

A stack descends wearing a numeral: IV, vi, ii. Work out which chord that is in the current key and fire it before the stack crosses the danger line. The right chord blows it apart. The wrong one is absorbed, and the stack lurches closer. In the key of D, vi is B minor. In the key of A, it's F# minor. The numeral means the same thing in every key, and once that clicks, it never stops being useful.

THREE WAYS TO ANSWER

• Multiple choice. Four chords, one right. Start here.

• Name the notes.…

From the developer’s store description.

For developers and the curious

The full report

The evidence, sources, measurements and versions behind every label above.

Findings and evidence

Not yet tested
Not yet tested. No analysis has been published for this app. A missing label is not a clean bill of health.

What reviewers report

No review coverage

No review analysis published for this app.

Measurements

3 measured · 5 not assessed

“Not assessed” means we could not measure it. It is never a zero and never a pass.

From store data and reviews

Developer replies to reviews
Not assessed
Fewer than 50 reviews scanned — too few to state a rate
Price in the store description
The store description doesn’t list prices (most don’t)
Cancelling, in the store description
The store description doesn’t say how to cancel (most don’t)
Themes reported by reviewers
Not assessed
This app's reviews have not been assessed yet
Five-star share of ratings
90% or more five-star
Arithmetic on the stores' own published rating counts. It says nothing about why the ratings fall where they do.

In the app package we scanned

No package has been scanned for this app, so nothing is published about what it ships. That is an absence of evidence, not a finding.

Sensitive permissions
Not assessed
No package has been scanned for this app
Analytics or tracking SDKs in the scanned package
Not assessed
No package has been scanned for this app
Advertising SDKs in the scanned package
Not assessed
No package has been scanned for this app
How we know

Supporting measurements: not a complete list of possible harms or positives. Measurement vocabulary 1.4 · how these are measured

Versions and dates analysed

Not yet tested

Not yet tested. No analysis has been run for this app, so there is no version or date to report.

Store update history

Each store’s release notes, as the developer wrote them. They are the developer’s words, not ours.

App Store

Version 1.4 · 2026-09-19
The aliens are amp stacks now. Destroy one and it breaks up; let one through and it swaggers off the field. Boss fights are rebuilt. The boss arrives, its health is the cabs in its stack, and every hit knocks it back. The end screens tell you which key beat you. New in Practice: a chord chart. Every chord in every key, with the shapes to play it, open and barred. New sound: a bass line under play that walks down the key and quickens as the closest alien nears the danger line, plus new cues for hits, misses and breaches. Accuracy now counts a chord that got through as a failed attempt, so the stars agree with the number beside them. Respects your Reduce Motion setting. Cleaner docks,…

Shortened here; the full notes are on the store listing.

Assessment record

Status
Not yet tested
App identifier
chord-destroyer
Sources used
None recorded
Reviews read
None recorded
Package examined
No package scan
Human inspection
Not completed
How we know
Measurement vocabulary
1.4

Store facts

App Store

What the stores publish. Store ratings are the stores’ numbers, not Appworthy’s, and are never averaged across stores.

App Store

Store rating
5.00 ★ · 1 ratings
Version
1.4
Updated
19 Sep 2026
Price
Free · In-app purchases
Age rating
4+
Size
32 MB
Open in App Store
Developer
EggBag
Category
Games
Listing price
Free · In-app purchases

Purchases the store lists

 What this app sells

From the store listing. Billing terms are read from each purchase’s name — the stores don’t publish them — so treat them as a strong hint, not a disclosure.

Show 1 more purchase we couldn’t categorise

These are really on sale; we just can’t tell from the name whether they recur.

Full Game UnlockTerm not stated$0.99

Method and limits

What this report can and cannot show

What a missing label means

Not yet tested. No analysis has been published for this app, so there is no method to describe for it yet. A missing label is not a clean bill of health: it means nothing has been read, not that nothing is wrong.

Limits of this report

  • A package scan is static. It identifies code and text in one Android build. It does not measure a live ad session, test a deletion request, or count the steps needed to cancel.
  • Reviews keep their sample. A review-only charge shows distinct reviewers, the share and the sample size, and is published only once it clears that label’s published threshold. Calibration labels are machine-drafted and not yet confirmed by a person.
  • Not assessed is a state. It is never a zero and never a pass.
  • A missing label is not a clean bill of health. It means the evidence did not support one, not that the app is problem-free.
Not yet human-reviewed. A human review gives an app hands-on, recorded measurements. None has been run for this app. Hands-on inspections are not yet open.
Review thresholds Read the methodology For developers

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