# Interval Timer Calendar vs HIIT Timer / Interval Timer

The clearest difference is update cadence: Interval Timer Calendar at every 3 days against HIIT Timer / Interval Timer's every 2 months. Interval Timer Calendar also leads on iOS requirement (11.0 vs 26.0). On price, ads, in-app purchases and monetization model there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

Interval Timer Calendar ships an update every 3 days, HIIT Timer / Interval Timer every 2 months. The most recent releases landed on September 25, 2026 and September 17, 2026 respectively.

## The numbers

| Metric | Interval Timer Calendar | HIIT Timer / Interval Timer |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[4.9 (14 ratings)](https://appshunter.io/ios/app/hiit-timer-interval-timer/id1610842683/reviews)** |
| Number of ratings | — | **14** |
| Positive reviews | 53.8% of reviews | — |
| In-app purchases | No | No |
| Ads | Yes | Yes |
| Update frequency | **Every 3 days** | Every 2 months |
| Monetization | Ad-supported | Ad-supported |
| Size | 14 MB | 12 MB |
| Requires iOS | **11.0** | 26.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [isao utsumi](https://appshunter.io/developer/800652888) | [FugaPiyo Inc.](https://appshunter.io/developer/1497887610) |

## What reviewers say

### Interval Timer Calendar

[App page](https://appshunter.io/ios/app/interval-timer-calendar/id1507102637)

This app helps you track your workouts with a simple timer and calendar integration. Set your training and break times, and automatically record your sessions. Save custom timers for quick access to your favorite routines.

**Highlights:** Muscle training timer, Automatic calendar recording, Save custom timer lists, Background operation support, Notification alerts, Workout review on calendar

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

**In-app purchases:** none


### HIIT Timer / Interval Timer

[App page](https://appshunter.io/ios/app/hiit-timer-interval-timer/id1610842683)

This app provides a customizable timer for high-intensity interval training. Easily set up warm-up, workout, and cool-down periods with adjustable intervals and counts. Personalize colors, sounds, and notifications for a tailored experience.

**Highlights:** Unlimited timer creation, Customizable intervals (warm-up, workout, cool-down), Adjustable counts, Color and sound customization, Dark mode support, Background notifications

**Features:** Vision Pro support

**In-app purchases:** none


## Frequently asked questions

### Is Interval Timer Calendar free?

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

### Is HIIT Timer / Interval Timer free?

HIIT Timer / Interval Timer is free to download, with no in-app purchases.

### Do Interval Timer Calendar or HIIT Timer / Interval Timer have ads?

Both Interval Timer Calendar and HIIT Timer / Interval Timer show ads.

### Which is updated more often, Interval Timer Calendar or HIIT Timer / Interval Timer?

Interval Timer Calendar ships an update every 3 days, and HIIT Timer / Interval Timer every 2 months. Most recently, Interval Timer Calendar was updated on September 25, 2026 and HIIT Timer / Interval Timer on September 17, 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.*