Comparison

Clustering vs Keys Trainer

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

Head to head
About

Clustering

This music practice tool allows improvisers to set up chordal structures and use them as practice material. Explore root movements through various cycles to discover new musical ideas and enhance your practice routine.

Highlights
  • Set up chordal structures
  • Use clusters for practice
  • Explore root movements
  • Practice through cycles (fourths, chromatic)
  • Enhance musical practice
Features
Read full description

Clustering is a musical practice tool for iOS. It lets you setup a cluster (or any chordal structure) and use it for practice material. By taking the cluster through a series of root movements, you can bring some fun and interesting discoveries into your practicing. I've always found clusters to be very inspiring and challenging. Take an inspiring chord/sound through the cycle of fourths, or chromatically or just repeat it. It's such a great way to enhance your practicing.

About

Keys Trainer

Master key signatures and scales with this music learning app. Practice identifying keys, understanding note sharps/flats, and instantly recognizing scale layouts on a keyboard. Features include customizable practice, passive viewing, and a challenging game mode.

Highlights
  • Key signature recognition
  • Scale layout identification
  • Customizable learning range
  • Intelligent training based on performance
  • Practice, View, Game, and Search modes
  • Earn coins, medals, and trophies
Features
Read full description

Do you want to be capable of recognizing the key signatures at first sight? That is, when you see a key signature, you know what key it is and what notes should be sharp or flat immediately. Do you want to have the ability of instantly identifying the scale layout on a piano/keyboard for a given key? If your answer is yes, check out this app. It can help you acquire these skills which can definitely benefit your music learning and piano playing. Main Features: • Practice Mode You learn at your own pace simply by answering the question, and if you are wrong, the correct answer will be shown for the duration of your choice. • View Mode You don’t need to do anything but watching, the questions and answers will be shown automatically after the delay of your choice. Good for lazy people like me. • Game Mode In this exciting countdown mode, you can challenge yourself and earn as many coins, medals, and trophies as you can. • Search Mode This mode allows you to look up the keys by name, key signature or keyboard. • Learning Range Customization You can customize your learning range sot that you can focus on improving your weaknesses. • Intelligent Training Each question is generated intelligently based on the statistical information of your performance so that it can turn your weaknesses into strengths.

Screenshots

Clustering2 screens
Keys Trainer4 screens

Verdict

The call

The clearest difference is price: Keys Trainer at $2.99 against Clustering's $5.99. Keys Trainer also leads on iOS requirement (12.0 vs 15.6). On review sentiment, 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

CostPrice · In-app purchases · Ads · Monetization

Clustering costs $5.99 and Keys Trainer $2.99 up front. Neither carries in-app purchases, so what you see is what you pay.

UpkeepUpdate frequency

Clustering ships an update every 5 months, Keys Trainer every 9 months. The most recent releases landed on June 1, 2026 and October 5, 2026 respectively.

Scorecard2 real differences · 8 level
Clustering versus Keys Trainer: the parameters behind the verdict, then further details
ParameterClusteringKeys Trainer
Price$5.99$2.99 — better
Rating—5.0 (2 ratings) — better
Positive reviews0.0% of reviews0.0% of reviews
Number of ratings—2 — better
Update frequencyEvery 5 months — betterEvery 9 months
AdsNoNo
In-app purchasesNoNo
MonetizationPaidPaid
DevicesiPhone, iPad, iPodiPhone, iPad, iPod
Requires iOS15.612.0 — better
Further details — not scored
Size60 MB30 MB
Age rating4+4+
Developertingjing.comPlearn LLC

Customer experience

Clustering

Written reviews1 reviews
Positive0.0%
Neutral0.0%
Negative100.0%

Keys Trainer

All ratings2 ratings
Positive100.0%
Neutral0.0%
Negative0.0%
Written reviews1 reviews
Positive0.0%
Neutral100.0%
Negative0.0%

In-app purchases

None

Clustering

No in-app purchases

None

Keys Trainer

No in-app purchases

Questions

Is Clustering free?
Clustering costs $5.99, with no in-app purchases.
Is Keys Trainer free?
Keys Trainer costs $2.99, with no in-app purchases.
Do Clustering or Keys Trainer have ads?
Neither Clustering nor Keys Trainer shows ads.
Which is updated more often, Clustering or Keys Trainer?
Clustering ships an update every 5 months, and Keys Trainer every 9 months. Most recently, Clustering was updated on June 1, 2026 and Keys Trainer on October 5, 2026.

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