# HIIT Interval Timer | Cero vs Next Up

The clearest difference is ads: Next Up at none against HIIT Interval Timer | Cero's shown. Next Up also leads on ratings volume (2.8K vs 435) and iOS requirement (13.0 vs 16.0). HIIT Interval Timer | Cero's advantage is update cadence (every 3 days vs every 5 weeks). On price, rating, review sentiment 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 Next Up sells 2 in-app purchases, starting at $3.99 per month. 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 4.7 for Next Up. That said, the two scores are not equally well evidenced: Next Up has 2.8K ratings behind it against 435, so its average is the more settled of the two. Written reviews split almost evenly too, at 75% and 75% positive.

HIIT Interval Timer | Cero ships an update every 3 days, Next Up every 5 weeks. The most recent releases landed on October 12, 2026 and October 9, 2026 respectively.

## The numbers

| Metric | HIIT Interval Timer | Cero | Next Up |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.7 (435 ratings)](https://appshunter.io/ios/app/hiit-interval-timer-cero/id1256319392/reviews)** | [4.7 (2.8K ratings)](https://appshunter.io/ios/app/next-up-interval-timer/id1376927836/reviews) |
| Number of ratings | 435 | **2.8K** |
| Positive reviews | 74.6% of reviews | **75.5% of reviews** |
| In-app purchases | Yes | Yes |
| Ads | Yes | **No** |
| Update frequency | **Every 3 days** | Every 5 weeks |
| Monetization | Free with in-app purchases | Free with in-app purchases |
| Size | 43 MB | 22 MB |
| Requires iOS | 16.0 | **13.0** |
| Devices | iPhone, iPad, Apple Watch | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Flawless Studio LLC](https://appshunter.io/developer/1228312508) | [Alysha Kwok](https://appshunter.io/developer/1376927835) |

## 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


### Next Up

[App page](https://appshunter.io/ios/app/next-up-interval-timer/id1376927836)

Create and customize interval timers with detailed options for reps, sets, colors, and sounds. Offers flexible display modes, quick actions for navigation, and background notifications. Organize timers with folders and choose between light and dark themes.

**Highlights:** Customizable intervals (reps, sets, colors, sounds), Detailed and full-screen display modes, Portrait and landscape orientation support, Quick actions for navigation and editing, Background notifications, Timer organization with folders

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

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Syncing and Sharing | $3.99 | per month |
| Upgrade | $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 Next Up free?

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

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

HIIT Interval Timer | Cero is rated higher. HIIT Interval Timer | Cero averages 4.7 out of 5 from 435 ratings, while Next Up averages 4.7 from 2.8K ratings.

### Do HIIT Interval Timer | Cero or Next Up have ads?

HIIT Interval Timer | Cero shows ads; Next Up does not.

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

HIIT Interval Timer | Cero ships an update every 3 days, and Next Up every 5 weeks. Most recently, HIIT Interval Timer | Cero was updated on October 12, 2026 and Next Up on October 9, 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.*