# Interval Timer □ HIIT Timer vs Ground Zero

The clearest difference is in-app purchases: Ground Zero at none against Interval Timer □ HIIT Timer's 5. Ground Zero also leads on iOS requirement (13 vs 15.6). On price, update cadence, ads and device support there is nothing between them.

Both are free to download. Interval Timer □ HIIT Timer sells 5 in-app purchases, starting at $1.99 per month. Ground Zero asks for nothing beyond the download.

Interval Timer □ HIIT Timer ships an update every 5 weeks, Ground Zero monthly. The most recent releases landed on September 30, 2026 and September 22, 2026 respectively.

## The numbers

| Metric | Interval Timer □ HIIT Timer | Ground Zero |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.8 (86K ratings)](https://appshunter.io/ios/app/interval-timer-hiit-timer/id1124297113/reviews)** | — |
| Number of ratings | **86K** | — |
| Positive reviews | 60.6% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Every 5 weeks | **Monthly** |
| Monetization | Freemium | — |
| Size | 34 MB | 14 MB |
| Requires iOS | 15.6 | **13** |
| Devices | **iPhone, iPad, iPod** | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Float Tech, LLC](https://appshunter.io/developer/483697886) | [Konstantinos Anagnostakis](https://appshunter.io/developer/545699886) |

## What reviewers say

### Interval Timer □ HIIT Timer

[App page](https://appshunter.io/ios/app/interval-timer-hiit-timer/id1124297113)

Create custom workout timers with adjustable intervals for exercise and rest.  Track your progress with detailed history and statistics, and repeat past workouts easily.  Enjoy audio cues without interrupting your music.

**Highlights:** Customizable intervals, Workout and rest timers, Voice or beep guides, Background audio support, Workout history and statistics, Repeat previous workouts

**Features:** Vision Pro support

**In-app purchases (5)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Premium Pass | $1.99 | per month |
| Premium Pass | $2.99 | per month |
| Lifetime Pass | $14.99 | one-time |
| Lifetime Pass | $19.99 | one-time |
| Premium Forever Promo | $29.99 | one-time |

**What reviewers like**

- 🚀 Simple and easy to use
- 👍 Customizable settings
- 🚀 Intuitive interface
- 🚀 Effective for HIIT workouts
- 👍 Helpful voice prompts

**What reviewers complain about**

- 🔒 Requires subscription after limited free use
- 🐛 Music volume issues with voice prompts
- 🐛 Inconsistent behavior when switching apps
- 🐛 Lack of final workout notification

**Reported bugs**

- Timer not always accurate
- Favorites/saved workouts feature not working
- Inconsistent behavior when pausing/resuming

**Requested features**

- Ability to save and name custom workouts
- More flexibility in exercise/rest time settings
- Option to adjust volume of voice prompts


### Ground Zero

[App page](https://appshunter.io/ios/app/ground-zero/id6445839166)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Interval Timer □ HIIT Timer free?

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

### Is Ground Zero free?

Ground Zero is free to download, with no in-app purchases.

### Do Interval Timer □ HIIT Timer or Ground Zero have ads?

Neither Interval Timer □ HIIT Timer nor Ground Zero shows ads.

### Which is updated more often, Interval Timer □ HIIT Timer or Ground Zero?

Interval Timer □ HIIT Timer ships an update every 5 weeks, and Ground Zero monthly. Most recently, Interval Timer □ HIIT Timer was updated on September 30, 2026 and Ground Zero on September 22, 2026.

---

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