Comparison

Functional Ear Trainer vs Sostenuto

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

Head to head
About

Functional Ear Trainer

Develop your musical ear by learning to recognize tones within the context of a specific musical key. This app helps you understand the function of each note, improving your ability to transcribe, improvise, and play music by ear. Suitable for all ages and skill levels, with just 10 minutes of daily practice.

Highlights
  • Recognize tones in musical key context
  • Understand note function
  • Improve transcription skills
  • Enhance improvisation
  • Develop perfect pitch
  • Daily 10-minute practice
Features
Read full description

Have you (or maybe one of your friends) ever wanted to learn to transcribe or play music by ear? It is so important for a musician to know what you are hearing. A good musical ear helps when you are composing, improvising, transcribing melodies, or playing with others. Most likely you have already tried different programs to learn to recognize intervals or even to acquire perfect pitch. However, although such programs develop your ear, but can you actually play any melody you hear as soon as you listen to it? Imagine you could understand music... It is like when somebody is talking to you, you not only hear pleasant sounds, but you recognize words and their meaning. One day I came across Alain Benbassat's program called "Functional Ear Trainer" and have been using it ever since. It is based on Alain's method to learn to recognize tones. The main difference between the Functional Ear Trainer and other methods is that it teaches you to distinguish between tones in the context of a particular musical key. You begin to recognize the role (or function) of each tone in this key, which is incredibly similar to its role in other keys of the same scale. And it is *guaranteed* anyone can gradually develop this skill. It does not matter: - who you are - an absolute beginner in music or a virtuoso professional musician; - how old you are - a 3 yo kid or a 90+ adult; - what musical instrument you play (you don't even have to play one). The only requirement is to practice for 10 minutes a day. I was so excited about this ear trainer that I have developed a mobile app based on the Alain Benbassat method. I hope you will find it useful.

About

Sostenuto

This app helps musicians build a lasting repertoire by using spaced repetition and AI coaching. It intelligently schedules practice sessions to combat forgetting and provides personalized feedback based on your progress.

Highlights
  • Intelligent practice scheduling
  • AI practice coach
  • Repertoire management
  • Audio/video recording
  • Practice streaks and achievements
  • Sheet music storage
Features
Read full description

Build a Repertoire You'll Never Forget. Stop learning songs just to forget them two weeks later. Sostenuto is the first music practice system built on the science of the Forgetting Curve and Spaced Repetition (SRS). Most musicians spend 80% of their time relearning what they've already studied. Sostenuto flips the script. Our intelligent scheduling system tells you exactly WHAT to practice and WHEN - right before your brain is about to forget it. Meet Maestro AI, your personal practice coach. Maestro analyzes your study logs and gives you targeted advice based on your real data - not generic tips. THE SOSTENUTO METHOD: 1. ADD: Catalog the songs, scales, or phrases you want to master. 2. PRACTICE: Use the built-in session tracker and capture audio/video for self-critique. 3. RETAIN: Our SRS algorithm schedules your reviews so your progress compounds daily. FEATURES: - Intelligent Daily Practice Schedule - AI Practice Coach (Maestro) - Repertoire Management for all instruments - BPM Tracking (current vs. target) - Audio & Video Practice Recording - Practice Streaks & Gem Achievements - Sheet Music Storage - Optimized for Guitarists, Pianists, and Multi-instrumentalists Don't just practice. Build a repertoire that's yours forever. Privacy Policy: https://sostenuto.app/privacy-policy Terms of Service: https://sostenuto.app/terms-of-service Standard Apple EULA: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/

Screenshots

Functional Ear Trainer4 screens
Sostenuto4 screens

Verdict

The call

The clearest difference is rating: Functional Ear Trainer at 4.9 against Sostenuto's 3.0. Functional Ear Trainer also leads on ratings volume (3.9K vs 2). Sostenuto's advantage is update cadence (every 3 weeks vs every 7 months). On price, review sentiment, 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

Both are free to download. Functional Ear Trainer sells 1 one-off in-app purchase and Sostenuto sells 2 in-app purchases, starting at $4.99 per month. Whichever you choose, the download price is not the number that matters.

ReceptionRating · Positive reviews · Number of ratings

Functional Ear Trainer holds the better App Store score, 4.9 against 3.0. That said, the two scores are not equally well evidenced: Functional Ear Trainer has 3.9K ratings behind it against 2, so its average is the more settled of the two. Written reviews complicate that: 97% of Functional Ear Trainer's written reviews are positive against 100% of Sostenuto's, so the app with the better star average is not the one people write more warmly about.

UpkeepUpdate frequency

Functional Ear Trainer ships an update every 7 months, Sostenuto every 3 weeks. The most recent releases landed on November 11, 2026 and October 31, 2026 respectively.

Scorecard3 real differences · 7 level
Functional Ear Trainer versus Sostenuto: the parameters behind the verdict, then further details
ParameterFunctional Ear TrainerSostenuto
PriceFreeFree
Rating4.9 (3.9K ratings) — better3.0 (2 ratings)
Positive reviews96.7% of reviews100.0% of reviews — better
Number of ratings3.9K — better2
Update frequencyEvery 7 monthsEvery 3 weeks — better
AdsNoNo
In-app purchasesYesYes
MonetizationFree with in-app purchasesFreemium
DevicesiPhone, iPad, iPod — betteriPhone, iPad
Requires iOS15.0 — better16.4
Further details — not scored
Size41 MB54 MB
Age rating4+4+
DeveloperSerhii KorchanValerio De Feo

Customer experience

Functional Ear Trainer

All ratings3,749 ratings
Positive98.1%
Neutral0.8%
Negative1.1%
Written reviews1,036 reviews
Positive96.7%
Neutral1.4%
Negative1.9%

Sostenuto

All ratings2 ratings
Positive50.0%
Neutral0.0%
Negative50.0%
Written reviews1 reviews
Positive100.0%
Neutral0.0%
Negative0.0%

Bugs and requests

Functional Ear Trainer

Reported bugs

2 issues
  • Keyboard display issues when selecting all chromatic notes
  • Inconsistent note resolutions in some exercises

Requested features

5 requests
  • Add support for multiple notes/chords at once
  • Implement a mode for training key recognition
  • Provide more customization options for exercises
  • Include voice input to play the notes
  • Add support for German/Norwegian key names

Sostenuto

Not enough reviews yet to summarise bugs or requests.

In-app purchases

1 purchases

Functional Ear Trainer

One-time1
  • Functional Ear Trainer Plus$19.99
2 purchases

Sostenuto

Subscriptions2
  • Sostenuto Pro Monthly7 Days trial$4.991 Month
  • Sostenuto Pro Annual7 Days trial$29.991 Year

Questions

Is Functional Ear Trainer free?
Functional Ear Trainer is free to download, with in-app purchases available.
Is Sostenuto free?
Sostenuto is free to download, with in-app purchases available.
Which has better reviews, Functional Ear Trainer or Sostenuto?
Functional Ear Trainer is rated higher. Functional Ear Trainer averages 4.9 out of 5 from 3.9K ratings, while Sostenuto averages 3.0 from 2 ratings.
Do Functional Ear Trainer or Sostenuto have ads?
Neither Functional Ear Trainer nor Sostenuto shows ads.
Which is updated more often, Functional Ear Trainer or Sostenuto?
Functional Ear Trainer ships an update every 7 months, and Sostenuto every 3 weeks. Most recently, Functional Ear Trainer was updated on November 11, 2026 and Sostenuto on October 31, 2026.

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