# Timer Tabata for Workout, HIIT vs Serene Kid

The clearest difference is in-app purchases: Serene Kid at none against Timer Tabata for Workout, HIIT's 6. Serene Kid also leads on iOS requirement (15.6 vs 17.0). Timer Tabata for Workout, HIIT's advantage is update cadence (fortnightly vs every 2 months). On price, ads and device support there is nothing between them.

Both are free to download. Timer Tabata for Workout, HIIT sells 6 in-app purchases, starting at $2.99 per month. Serene Kid asks for nothing beyond the download.

Timer Tabata for Workout, HIIT ships an update fortnightly, Serene Kid every 2 months. The most recent releases landed on October 26, 2026 and October 14, 2026 respectively.

## The numbers

| Metric | Timer Tabata for Workout, HIIT | Serene Kid |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.7 (536 ratings)](https://appshunter.io/ios/app/timer-tabata-for-workout-hiit/id756930454/reviews)** | — |
| Number of ratings | **536** | — |
| Positive reviews | 80.6% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | **Fortnightly** | Every 2 months |
| Monetization | Freemium | — |
| Size | 82 MB | 103 MB |
| Requires iOS | 17.0 | **15.6** |
| Devices | **iPhone, iPad, Mac, Apple Watch** | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Alexander Senin](https://appshunter.io/developer/697788524) | [Advanced Yoga Therapy, Inc](https://appshunter.io/developer/1040239993) |

## What reviewers say

### Timer Tabata for Workout, HIIT

[App page](https://appshunter.io/ios/app/timer-tabata-for-workout-hiit/id756930454)

This app provides a versatile interval timer for various training styles, including Tabata, HIIT, and general workouts. It offers background operation and round tracking, with optional premium features and Health app integration.

**Highlights:** Tabata Protocol timer, Rounds timer, Stopwatch mode, Interval timer, Workout of the day display, Background operation (premium), Round number and duration display

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

**In-app purchases (6)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Best Timer for a Month | $2.99 | per month |
| Best Timer for a Year | $12.99 | per year |
| Tip developer | $0.99 | one-time |
| Full version | $1.99 | one-time |
| Boost of Energy | $1.99 | one-time |
| Source of Inspiration | $3.99 | one-time |

**What reviewers like**

- 🚀 Simple and flexible
- 🚀 Works well in the background
- 👍 Reliable and convenient
- 👍 Versatile for different workouts
- 👍 Great for interval training

**What reviewers complain about**

- 💰 Subscription model for full features
- 💰 Paid app after previously being free
- 💰 Paid version doesn't restore previous purchases
- 🔇 Loud beeping sound
- 🐛 Glitchy on Apple Watch

**Reported bugs**

- Workout tracking stops working on Apple Watch
- Timer loses track when screen turns off

**Requested features**

- Ability to set custom intervals and rest times
- Option to repeat previous rounds
- Adjustable volume for alerts
- Ability to save and load custom workout routines


### Serene Kid

[App page](https://appshunter.io/ios/app/serene-kid/id6463867124)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Timer Tabata for Workout, HIIT free?

Timer Tabata for Workout, HIIT is free to download, with in-app purchases available.

### Is Serene Kid free?

Serene Kid is free to download, with no in-app purchases.

### Do Timer Tabata for Workout, HIIT or Serene Kid have ads?

Neither Timer Tabata for Workout, HIIT nor Serene Kid shows ads.

### Which is updated more often, Timer Tabata for Workout, HIIT or Serene Kid?

Timer Tabata for Workout, HIIT ships an update fortnightly, and Serene Kid every 2 months. Most recently, Timer Tabata for Workout, HIIT was updated on October 26, 2026 and Serene Kid on October 14, 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.*