# HIIT Interval Timer | Cero vs GymFit

The clearest difference is update cadence: HIIT Interval Timer | Cero at every 3 days against GymFit's every 11 days. HIIT Interval Timer | Cero also leads on ratings volume (435 vs 17) and review sentiment (75% vs 62%). On price, rating, ads and in-app purchases there is nothing between them.

Both are free to download. HIIT Interval Timer | Cero sells 2 in-app purchases, starting at $2.99 per month and GymFit sells 12 in-app purchases, starting at $1.99 per 7 days. Whichever you choose, the download price is not the number that matters.

On the App Store both sit at effectively the same score — 4.7 for HIIT Interval Timer | Cero against 4.6 for GymFit. That said, the two scores are not equally well evidenced: HIIT Interval Timer | Cero has 435 ratings behind it against 17, so its average is the more settled of the two. Written reviews are what separate them: 75% of HIIT Interval Timer | Cero's written reviews are positive against 62% of GymFit's.

HIIT Interval Timer | Cero ships an update every 3 days, GymFit every 11 days. The most recent releases landed on October 16, 2026 and October 17, 2026 respectively.

## The numbers

| Metric | HIIT Interval Timer | Cero | GymFit |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.7 (435 ratings)](https://appshunter.io/ios/app/hiit-interval-timer-cero/id1256319392/reviews)** | [4.6 (17 ratings)](https://appshunter.io/ios/app/gymfit-interval-tabata-timer/id1263610072/reviews) |
| Number of ratings | **435** | 17 |
| Positive reviews | **74.6% of reviews** | 61.5% of reviews |
| In-app purchases | Yes | Yes |
| Ads | Yes | Yes |
| Update frequency | **Every 3 days** | Every 11 days |
| Monetization | Free with in-app purchases | Free with in-app purchases |
| Size | 42 MB | 55 MB |
| Requires iOS | **16.0** | 17.0 |
| Devices | **iPhone, iPad, Apple Watch** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Flawless Studio LLC](https://appshunter.io/developer/1228312508) | [Poutier Ventures LLC](https://appshunter.io/developer/1263610071) |

## What reviewers say

### HIIT Interval Timer | Cero

[App page](https://appshunter.io/ios/app/hiit-interval-timer-cero/id1256319392)

This interval timer app enhances various workouts like HIIT, Tabata, and yoga with intuitive design and customizable timer modes. Create and save custom intervals, track calorie expenditure, and sync settings across devices, including Apple Watch.

**Highlights:** Customizable interval timers, Simple and advanced timer modes, Create and save multiple workout settings, Apple Watch compatibility with heart monitor, Automatic calorie tracking to Apple Health, Cross-device sync

**Features:** macOS Compatibility, Apple Watch app, Vision Pro support

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Cero Pro Monthly | $2.99 | per month |
| Cero Pro | $14.99 | one-time |

**What reviewers like**

- 👍 Simple and straightforward
- 👍 Very practical and customizable
- 👍 Great for HIIT and Tabata
- 👍 Clear design and easy to use
- 👍 Good value, no subscription

**What reviewers complain about**

- 🔋 Drains battery
- 🎶 Music playback interrupted
- ⚠️ Ads interrupt timers
- 🔊 Weak or non-functional sound/haptics
- 🔄 Forced updates

**Reported bugs**

- App runs in background draining battery
- Rotation broke after update
- Apple workout app overrides Cero app on Apple Watch
- Interval signals too weak or not working

**Requested features**

- Ability to group timers
- Option to add warm-up and cool-down features
- Ability to type numbers for time adjustment
- Timer sounds through headphones or interrupting music
- Ability to change exercise names


### GymFit

[App page](https://appshunter.io/ios/app/gymfit-interval-tabata-timer/id1263610072)

This app helps experienced gym-goers optimize their workouts by providing customizable interval timers. It allows users to create, save, and edit workout routines, track progress, and manage time efficiently to maximize productivity during gym sessions.

**Highlights:** Create customizable workouts, Add unlimited intervals, Edit and rearrange intervals, Save custom workout routines, Integrates with Apple HealthKit, Easy-to-use interface

**Features:** macOS Compatibility

**In-app purchases (12)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Weekly Subscription | $1.99 | per 7 days |
| Monthly Subscription | $4.99 | per month |
| Yearly Subscription | $19.99 | per year |
| Yearly Subscription | $19.99 | per year |
| Yearly Subscription | $29.99 | per year |
| Yearly Subscription | $29.99 | per year |
| Yearly Subscription | $29.99 | per year |
| 3 Day Trial Then Yearly Trial | $39.99 | per year |
| Week Trial Yearly Subscription | $39.99 | per year |
| Yearly Subscription | $49.99 | per year |
| Remove All Ads | $1.99 | one-time |
| Ad & Workout Generator Bundle | $2.99 | one-time |


## Frequently asked questions

### Is HIIT Interval Timer | Cero free?

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

### Is GymFit free?

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

### Which has better reviews, HIIT Interval Timer | Cero or GymFit?

HIIT Interval Timer | Cero is rated higher. HIIT Interval Timer | Cero averages 4.7 out of 5 from 435 ratings, while GymFit averages 4.6 from 17 ratings.

### Do HIIT Interval Timer | Cero or GymFit have ads?

Both HIIT Interval Timer | Cero and GymFit show ads.

### Which is updated more often, HIIT Interval Timer | Cero or GymFit?

HIIT Interval Timer | Cero ships an update every 3 days, and GymFit every 11 days. Most recently, HIIT Interval Timer | Cero was updated on October 16, 2026 and GymFit on October 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.*