Interval Training vs Harmonize Trainer
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Interval Training
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Interval Training is an ear-training app for everyone learning music. [Main features] - Quiz format: compare two tones and name the interval - Wide range of intervals, from perfect unison to perfect octave - Visualize your skill through accuracy and answer speed - Steady ear improvement with daily training Perfect for instrumentalists, singers, music students, DTM creators, and everyone involved in music. Sharpen your ear like a game during spare moments on your commute.
Harmonize Trainer
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Learn to practice harmonizing with real-time feedback. Use the practice mode to hear notes and practice singing major 3rd and 5th harmonies. Short, easy-to-understand lessons introducing you to harmonies - simple enough for any age. No theory, all practical. Find your vocal range so your lessons align to you specifically.
Screenshots
Verdict
The clearest difference is price: Interval Training at Free against Harmonize Trainer's $1.99. Interval Training also leads on update cadence (every 2 weeks vs every 3 months). Harmonize Trainer's advantage is ads (none vs shown) and chart position (#200 vs unranked). On 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
Interval Training is free to download; Harmonize Trainer costs $1.99 up front. Neither carries in-app purchases, so what you see is what you pay.
Interval Training ships an update every 2 weeks, Harmonize Trainer every 3 months. The most recent releases landed on October 15, 2026 and October 9, 2026 respectively.
| Parameter | Interval Training | Harmonize Trainer |
|---|---|---|
| Price | Free — better | $1.99 |
| Update frequency | Every 2 weeks — better | Every 3 months |
| Ads | Yes | No — better |
| In-app purchases | No | No |
| Best chart rank | — | #200 — better |
| Devices | iPhone, iPad | iPhone, iPad, iPod — better |
| Requires iOS | 17.0 | 15.0 — better |
| Further details — not scored | ||
| Size | 5 MB | 31 MB |
| Age rating | 4+ | 4+ |
| Developer | MIZOU, CO., LTD. | Stephen Michael Cesler |
In-app purchases
Interval Training
No in-app purchases
Harmonize Trainer
No in-app purchases
Questions
Is Interval Training free?
Is Harmonize Trainer free?
Do Interval Training or Harmonize Trainer have ads?
Which is updated more often, Interval Training or Harmonize Trainer?
Other comparisons
