# Intervals One vs HIIT Timer

The clearest difference is update cadence: HIIT Timer at every 4 weeks against Intervals One's every 4 months. On price, ads, in-app purchases and device support there is nothing between them.

Both are free to download. Intervals One sells 3 in-app purchases, starting at $1.99 per month and HIIT Timer sells 1 one-off in-app purchase. Whichever you choose, the download price is not the number that matters.

Intervals One ships an update every 4 months, HIIT Timer every 4 weeks. The most recent releases landed on October 30, 2026 and November 5, 2026 respectively.

## The numbers

| Metric | Intervals One | HIIT Timer |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | Every 4 months | **Every 4 weeks** |
| Size | 64 MB | 2 MB |
| Requires iOS | 17.0 | 17.0 |
| Devices | iPhone, iPad | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Ninety Six Software Ltd](https://appshunter.io/developer/1728731100) | [Hyunwoo Lee](https://appshunter.io/developer/1883358620) |

## What reviewers say

### Intervals One

[App page](https://appshunter.io/ios/app/intervals-one-interval-timer/id6741439106)

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

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Pro Monthly | $1.99 | per month |
| Pro Annual | $14.99 | per year |
| Pro Lifetime | $19.99 | one-time |


### HIIT Timer

[App page](https://appshunter.io/ios/app/hiit-timer-intervalflow/id6788945849)

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| IntervalFlow Pro | $9.99 | one-time |


## Frequently asked questions

### Is Intervals One free?

Intervals One is free to download, with in-app purchases available.

### Is HIIT Timer free?

HIIT Timer is free to download, with in-app purchases available.

### Do Intervals One or HIIT Timer have ads?

Neither Intervals One nor HIIT Timer shows ads.

### Which is updated more often, Intervals One or HIIT Timer?

Intervals One ships an update every 4 months, and HIIT Timer every 4 weeks. Most recently, Intervals One was updated on October 30, 2026 and HIIT Timer on November 5, 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.*