# Interval Training vs Harmonize Trainer

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.

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.

## The numbers

| Metric | Interval Training | Harmonize Trainer |
| --- | --- | --- |
| Price | **Free** | $1.99 |
| In-app purchases | No | No |
| Ads | Yes | **No** |
| Update frequency | **Every 2 weeks** | Every 3 months |
| Best chart rank | — | **#200** |
| Size | 5 MB | 31 MB |
| Requires iOS | 17.0 | **15.0** |
| Devices | iPhone, iPad | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [MIZOU, CO., LTD.](https://appshunter.io/developer/1542553141) | [Stephen Michael Cesler](https://appshunter.io/developer/1688595725) |

## What reviewers say

### Interval Training

[App page](https://appshunter.io/ios/app/interval-training-mizou/id6760253212)

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases:** none


### Harmonize Trainer

[App page](https://appshunter.io/ios/app/harmonize-trainer/id6781284983)

**Currently charting:** #200 Top Paid · Music (US App Store)

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases:** none


## Frequently asked questions

### Is Interval Training free?

Interval Training is free to download, with no in-app purchases.

### Is Harmonize Trainer free?

Harmonize Trainer costs $1.99, with no in-app purchases.

### Do Interval Training or Harmonize Trainer have ads?

Interval Training shows ads; Harmonize Trainer does not.

### Which is updated more often, Interval Training or Harmonize Trainer?

Interval Training ships an update every 2 weeks, and Harmonize Trainer every 3 months. Most recently, Interval Training was updated on October 15, 2026 and Harmonize Trainer on October 9, 2026.

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*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*