Comparison

Molecule Music vs Hark

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

Head to head
About

Molecule Music

Read full description

L'application s'articule en quatre pôles : quatre dimensions du mouvement musical. Il y a donc les mouvements mélodiques, harmoniques, rythmiques et enfin le phrasé ou articulation. Pour chaque pôle, les exercices permettent de travailler les éléments de vocabulaire propres au mouvement choisi, en imposant des moments de conscience obligés au sein d'une improvisation libre. Terms of Use (EULA): https://sites.google.com/view/termsofusemoleculemusic/accueil

About

Hark

This app trains musicians to identify notes within a musical key, focusing on their relationship to the tonic. It offers various training modes, including single notes, melodies, and chord progressions, with hands-free operation for convenient practice.

Highlights
  • Identify notes as scale degrees
  • Hands-free training mode
  • Multiple training modes (degrees, melodies, chords, progressions)
  • Visual staff with colored notes
  • Explore any note in any key
  • Multiple instrument sounds
Features
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Hark trains your ear the way musicians actually hear: every note as a degree of the key, not a distance from the note before it. A cadence — or a drone — puts the tonic in your ear. A note sounds. You answer on a ladder of degrees, with the home note at the bottom like the ground. Then the note walks home, step by step, back to the tonic, so you hear the pull instead of reading about it. That walk is the explanation. There is no lecture. FOUR KINDS OF TRAINING • Degrees — one note at a time, from two degrees up to all twelve • Melodies — short phrases, name every note in order • Chords in the key — I, IV, V and the rest, heard by function • Progressions — three and four chords in a row INSIDE • A ladder of seven colours: tonic gold, dominant blue, leading tone red • Notes on a staff, spelled the way the key spells them • The walk home after every answer • Hands-free: train with the screen off, on a walk or in the car. The key, the note, a pause for your answer, then the answer spoken aloud. • Explore: hold any degree in any key and listen. No score, no history. • Five instruments: piano, guitar, strings, choir, electric piano • Your map: accuracy by degree and by chord, and what your ear mixes up • Ten languages, and a ladder labelled with numbers, movable-do syllables or note names — Do–Si, Do–Ti, H and B where they belong FREE, FOR GOOD Five degree levels in C major — up to all seven degrees across two octaves — two melody levels, two chord levels, the first progression level, hands-free training, the staff, a week of statistics, and all of Explore: every degree in every key, there to listen to. No daily cap, no timers. HARK PRO — MONTHLY, YEARLY OR ONCE Training in all twelve keys, chromatic degrees, minor keys, three octaves, all seven chords with sevenths, progressions, melodies up to five notes, custom drills, and the full map of your ear with four weeks of history. Choose a monthly or yearly subscription, with a one-week free trial for eligible customers, or a one-time purchase for permanent Pro access. Only one free trial is available per subscription group. After the trial, the selected subscription renews at the price shown in the app. Subscriptions renew automatically unless cancelled at least 24 hours before the current period ends. Manage or cancel them in your Apple Account subscription settings. To avoid a charge after a free trial, cancel at least 24 hours before it ends. The free levels stay free either way. NO ACCOUNT, NO ADS No sign-up, no ads, no streaks and no nagging. Your individual answers and detailed training history stay on your device. The app sends a limited set of usage events with a random installation identifier, including session summaries and purchase or free-trial events, to help us understand how it works. The privacy policy lists what is sent. Terms of Use: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/ Privacy Policy: https://hark-ear.pages.dev/privacy

Screenshots

Molecule Music4 screens
Hark4 screens

Verdict

The call

The clearest difference is update cadence: Hark at every 2 days against Molecule Music's every 8 days. On price, ads, in-app purchases 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

Both are free to download. Molecule Music sells 3 in-app purchases, starting at $1.99 per month and Hark sells 3 in-app purchases, starting at $3.99 per month. Whichever you choose, the download price is not the number that matters.

UpkeepUpdate frequency

Molecule Music ships an update every 8 days, Hark every 2 days. Both last shipped on October 31, 2026.

Scorecard1 real difference · 9 level
Molecule Music versus Hark: the parameters behind the verdict, then further details
ParameterMolecule MusicHark
PriceFreeFree
Rating—5.0 (2 ratings) — better
Positive reviews—100.0% of reviews
Number of ratings—2 — better
Update frequencyEvery 8 daysEvery 2 days — better
AdsNoNo
In-app purchasesYesYes
Monetization—Freemium
DevicesiPhone, iPadiPhone, iPad
Requires iOS16.0 — better17.0
Further details — not scored
Size93 MB11 MB
Age rating4+4+
DeveloperJean ReymondIlia Usatov

In-app purchases

3 purchases

Molecule Music

Subscriptions3
  • 1 mois$1.991 Month
  • 6 mois$8.996 Months
  • 1 an$12.991 Year
3 purchases

Hark

Subscriptions2
  • Hark Pro — Monthly7 Days trial$3.991 Month
  • Hark Pro — Yearly7 Days trial$11.991 Year
One-time1
  • Hark Pro$19.99

Questions

Is Molecule Music free?
Molecule Music is free to download, with in-app purchases available.
Is Hark free?
Hark is free to download, with in-app purchases available.
Do Molecule Music or Hark have ads?
Neither Molecule Music nor Hark shows ads.
Which is updated more often, Molecule Music or Hark?
Molecule Music ships an update every 8 days, and Hark every 2 days. Most recently, Molecule Music was updated on October 31, 2026 and Hark on October 31, 2026.

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