# HIIT Interval Timer \| Cero — user reviews

> 59 indexed App Store user reviews of HIIT Interval Timer | Cero by Flawless Studio LLC, rated 4.70/5 from 435 ratings.

- Source: https://appshunter.io/ios/app/hiit-interval-timer-cero/id1256319392/reviews
- App overview in markdown: https://appshunter.io/ios/app/hiit-interval-timer-cero/id1256319392.md
- Rating breakdown: 5★ 368 · 4★ 36 · 3★ 17 · 2★ 6 · 1★ 8

## What do users think of HIIT Interval Timer | Cero?

Overall sentiment: positive

**Pros**

- 👍 Simple and straightforward
- 👍 Very practical and customizable
- 👍 Great for HIIT and Tabata
- 👍 Clear design and easy to use
- 👍 Good value, no subscription
- 👍 Works as expected
- 👍 Versatile for various workouts
- 👍 Intuitive and functional

**Cons**

- 🔋 Drains battery
- 🎶 Music playback interrupted
- ⚠️ Ads interrupt timers
- 🔊 Weak or non-functional sound/haptics
- 🔄 Forced updates
- 🧭 Back button change on Apple Watch

**Commonly 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

**Most 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

## Newest reviews (17 of 59)

### 4/5 — Great simple workout timer app

*2024-10-24, version 3.5.7*

App works great for creating flexibility routines.
Would love for there to be a way to group timers together to better manage related timers.

### 5/5 — برنامج رائع جداا احسنتم

*2024-05-31, version 3.5.7*

برنامج رائع جداا احسنتم

### 5/5 — Best timing app

*2024-05-27*

I purchased the app!! Loved that it’s just one price not a monthly subscription! I’ve been creating all my own treadmill workouts and it’s truly amazing!

**Developer response:** Thank you so much for your comment Stigz! 💚

### 5/5 — 👍

*2024-03-04, version 3.5.7*

Mehrere Timer... benutze ich gerne für mein Workout

### 5/5 — Parfaitement adaptée

*2024-02-12, version 3.5.7*

J’ai téléchargé plusieurs applications gratuites de ce genre pour comparer et c’est celle qui m’a le plus plu : le design, les sons, la facilité d’utilisation…pour le moment je n’ai rien à redire. Je m’en sers aussi bien pour le sport que pour la méthode pomodoro.

### 5/5 — Une super Appli

*2024-01-10, version 3.5.7*

Une super appli avec pleins de fonctionnalités pour gérer facilement les fractionnés ou autre et gérer son temps comme on le souhaite. Merci 🙏

### 5/5 — Bisher beste App...

*2023-04-20, version 3.5.7*

... für Intervalltraining. Einstellbare Time nach Bedarf.sogar wenn man nur die freue Version nutzt.

### 5/5 — Simple and perfect

*2023-02-22, version 3.5.7*

It works as it is expected

### 5/5 — Works great for HIIT runs

*2022-07-24*

Best app I have found so far. It’s free and has a lot of settings. I only have 1 high/low intensity timer programmed in, so I dont know how many you can have without upgrading. But I only needed 1.

**Developer response:** Thank you so much for feedback! 💚

### 5/5 — Très pratique et personnalisable !

*2022-07-02, version 3.5.5*

Très pratique et personnalisable !

### 5/5 — Great

*2022-06-13, version 3.5.5*

Best I have used

### 5/5 — Parfait pour gérer mes HIITS

*2022-05-22, version 3.5.5*

Un seul mot : au top

### 5/5 — Love it

*2022-04-02*

I love this app. I 100% recommend but not if they start charging a subscription or any of that ridiculous. Exactly what you need to hiit, or any kind of intervals at all.

**Developer response:** Thank you for your feedback EmoEric! 💚

### 5/5 — Very happy with this app

*2022-02-14, version 3.5.4*

App does what I need. Very happy.

### 5/5 — Au top

*2022-02-06, version 3.5.4*

Que d'améliorations et toujours super pratique

### 5/5 — Ideale

*2022-01-09, version 3.5.3*

Simple intuitif et fonctionnel

### 5/5 — Soweit werbefrei und auch auf der Apple watch top

*2021-09-02, version 3.5.3*

👍🏻

## Most critical reviews (10 lowest-rated)

### 1/5 — 평생이용 결제 했는데 앱을 바꿔버리네

*2026-09-16*

아니 PRO앱 평생이용 결재해서 쓰고 있는데 갑자기 해당지역에서 사용이 제한된다고 나오고 다시 기본앱에서 PRO결재하라고 하는 건 무슨 경우야?

**Developer response:** 안녕하세요! 저희 앱에는 지역 제한이 없으며 전 세계 어디에서나 사용하실 수 있습니다.

결제 화면(paywall)에서 **구독 복원(Restore Subscriptions)** 버튼을 눌러 주세요.

문제가 계속된다면 support@cero.app 으로 문의해 주세요.

감사합니다!

### 1/5 — Ads interrupt timers

*2025-12-23, version 3.7.3*

Why would I bother with this?

### 1/5 — Eats battery and money apparently

*2021-03-29, version 3.3.1*

When a 15 minute stretching routine takes me from 99% battery to 57% battery, that’s a problem.  

Also - getting tired of these timers that start off free with no ads, then suddenly have ads after updates.  Forced updates.   It’s a goddamn timer.  Does everyone need a handout for every line of code they write?  How about a model where the free version allows setting up 2 timers or some other limitation, and you pay for the fully featured product.  The fastest way to get me not to buy something is to force ads on me.  

Deleted app.

### 1/5 — Rotation broke

*2021-03-01, version 3.0.1*

After update, will not rotate landscape

### 1/5 — Nun leider mit Werbung zwischen jedem Training

*2021-01-26, version 2.7.2*

Edit... sorry von 5 Sterne zurück auf 1.Stern    klar müsst ihr von etwas leben... aber so macht mir mein Training halt keinen Spaß 

Vorher 5 Sterne 

Mit der neuen Version klappt jetzt alles. 
Also nun die volle Punktzahl

### 1/5 — forced updating

*2020-07-14, version 2.6.0*

Forced updating.  Nothing more to say, really.

### 1/5 — Simple interface but poor functionality

*2019-08-17*

Intervals are easy to set up but the signal at the end of the intervals are too weak or do not work at all. On my watch, the haptic feedback was too weak to be felt. I could not figure out how to make the chime work. On my phone, the beep was also too weak to be heard and the vibrate function did not work. I uninstalled this app. The search for a simple interval timer continues.

**Developer response:** Thanks for your feedback! We have improved many features of the app, improving the Watch logic and the sounds. We hope it meets your expectations 💪

### 2/5 — Nice app but a few major flaws

*2018-09-17*

I can’t listen to music while using it so...

**Developer response:** Hey Bokononism. Thanks for your feedback!

We have submitted a new version with many changes and improvements. Now you can listen your music in background! We hope you enjoy it!

### 2/5 — Needs more features

*2018-07-21*

The best design I’ve seen so far but there needs to be warmup and cooldown features to add to workout as well. Also, trying to adjust time by only using the plus and minus signs is irritating. We shpuld be able to type the numbers.

**Developer response:** Hey BgmKskn! Thank you for your comment!

We are working in a new version for August with advanced mode training with warm up and cooldown intervals ;). Thanks too for the type numbers idea, we will implement it too. Meanwhile there is a hold down option to select the seconds faster.

We appreciate all the feedback and we have it in mind. We look forward your 5 stars next month ;)

### 3/5 — Parfait

*2025-05-20, version 3.7.1*

L’application est très bien faite, tant visuellement, que dans sa compréhension

## Most praised reviews (10 highest-rated)

### 5/5 — Cero

*2026-02-15, version 3.7.3*

Dommage que l'on puisse pas changer le nom des exercices

### 5/5 — Excellent

*2026-02-10*

Works as it should.

### 5/5 — Awesome!

*2025-01-23, version 3.5.7*

Very simple and straightforward 😎

### 5/5 — Great

*2024-12-30*

Best I have used

**Developer response:** Thanks for your comment and feedback GerNob! 💚

### 5/5 — HIIT

*2024-12-16, version 3.5.7*

Parfait

### 5/5 — Great

*2024-09-08, version 3.5.7*

Love it

### 5/5 — Great Tabata tool!

*2024-09-07, version 3.5.7*

This Tabata app is my favorite.

### 5/5 — Top App

*2024-08-25, version 3.5.7*

Es ist genau das was man braucht und kostet nicht einmal was. Kein Firlefanz, klares Design, es gibt NICHTS auszusetzen, Danke!

### 5/5 — Love it

*2024-07-08*

Been using for years. Great for
HIIT, strength training, and also timing grilling burgers and steaks!

**Developer response:** Wow, Jared! You are a super loyal user, thanks for your valuable feedback! 💚

### 5/5 — Sehr gut

*2024-06-26, version 3.5.7*

Sehr gut

---

*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-09-20.*