# Interval Timer for HIIT | Cero vs GymFit

The clearest difference is update cadence: Interval Timer for HIIT | Cero at every 3 days against GymFit's every 11 days. Interval Timer for HIIT | Cero also leads on ratings volume (438 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. Interval Timer for HIIT | Cero sells 2 in-app purchases, starting at $2.99 per month and GymFit sells 10 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 Interval Timer for HIIT | Cero against 4.6 for GymFit. That said, the two scores are not equally well evidenced: Interval Timer for HIIT | Cero has 438 ratings behind it against 17, so its average is the more settled of the two. Written reviews are what separate them: 75% of Interval Timer for HIIT | Cero's written reviews are positive against 62% of GymFit's.

Interval Timer for HIIT | Cero ships an update every 3 days, GymFit every 11 days. The most recent releases landed on November 6, 2026 and November 2, 2026 respectively.

## The numbers

| Metric | Interval Timer for HIIT | Cero | GymFit |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.7 (438 ratings)](https://appshunter.io/ios/app/interval-timer-for-hiit-cero/id1256319392/reviews)** | [4.6 (17 ratings)](https://appshunter.io/ios/app/gymfit-interval-tabata-timer/id1263610072/reviews) |
| Number of ratings | **438** | 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 | 50 MB | 55 MB |
| Requires iOS | 18.0 | **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

### Interval Timer for HIIT | Cero

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

Create custom interval workouts for HIIT, Tabata, and circuit training. Features adaptive heart rate training, Siri integration, and Apple Watch support. Track progress and share your custom routines.

**Highlights:** Customizable interval programming, Adaptive heart rate training, Siri and Shortcuts integration, Apple Watch app, Workout history and sharing, Live Activities and Dynamic Island support

**Features:** macOS Compatibility, Apple Watch app, Vision Pro support, iPhone Duo 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 (10)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Weekly Subscription | $1.99 | per 7 days |
| Yearly Subscription | $19.99 | per year |
| Yearly Subscription | $19.99 | 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 Interval Timer for HIIT | Cero free?

Interval Timer for HIIT | 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, Interval Timer for HIIT | Cero or GymFit?

Interval Timer for HIIT | Cero is rated higher. Interval Timer for HIIT | Cero averages 4.7 out of 5 from 438 ratings, while GymFit averages 4.6 from 17 ratings.

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

Both Interval Timer for HIIT | Cero and GymFit show ads.

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

Interval Timer for HIIT | Cero ships an update every 3 days, and GymFit every 11 days. Most recently, Interval Timer for HIIT | Cero was updated on November 6, 2026 and GymFit on November 2, 2026.

---

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