# HIIT Workout Timer by Zafapp vs Interval Flow

The clearest difference is monetization model: HIIT Workout Timer by Zafapp at free with in-app purchases against Interval Flow's subscription. HIIT Workout Timer by Zafapp also leads on device support (4 vs 2) and iOS requirement (15.0 vs 18.6). Interval Flow's advantage is ads (none vs shown) and rating (4.7 vs 4.5). On price, update cadence and in-app purchases there is nothing between them.

Both are free to download. HIIT Workout Timer by Zafapp sells 3 one-off in-app purchases and Interval Flow sells 10 in-app purchases, starting at $4.99 per 3 months. Whichever you choose, the download price is not the number that matters.

Interval Flow holds the better App Store score, 4.7 against 4.5. That said, the two scores are not equally well evidenced: Interval Flow has 168 ratings behind it against 15, so its average is the more settled of the two. Written reviews point the same way: 40% of HIIT Workout Timer by Zafapp's written reviews are positive against 48% of Interval Flow's.

HIIT Workout Timer by Zafapp ships an update every 3 weeks, Interval Flow fortnightly. The most recent releases landed on August 23, 2026 and September 5, 2026 respectively.

## The numbers

| Metric | HIIT Workout Timer by Zafapp | Interval Flow |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [4.5 (15 ratings)](https://appshunter.io/ios/app/hiit-workout-timer-by-zafapp/id1502215429/reviews) | **[4.7 (168 ratings)](https://appshunter.io/ios/app/interval-flow-wod-timer/id6444124987/reviews)** |
| Number of ratings | 15 | **168** |
| Positive reviews | 40.0% of reviews | **48.1% of reviews** |
| In-app purchases | Yes | Yes |
| Ads | Yes | **No** |
| Update frequency | Every 3 weeks | **Fortnightly** |
| Monetization | **Free with in-app purchases** | Subscription |
| Size | 96 MB | 20 MB |
| Requires iOS | **15.0** | 18.6 |
| Devices | **iPhone, iPad, iPod, Apple Watch** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Cuneyt Zafer](https://appshunter.io/developer/1183636133) | [Bence Kaposzta](https://appshunter.io/developer/1650069302) |

## What reviewers say

### HIIT Workout Timer by Zafapp

[App page](https://appshunter.io/ios/app/hiit-workout-timer-by-zafapp/id1502215429)

This app helps you create custom interval training routines with adjustable sets, rounds, and exercise times. It also tracks your workout history, calculates calorie burn, and integrates with Apple Watch for heart rate monitoring and workout control.

**Highlights:** Custom interval timers (HIIT, Tabata), Reps and weight logging, Workout routine planner, Calorie burn calculation, Workout history and analysis, Apple Watch integration, Background music control

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

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Pro Version | $1.99 | one-time |
| Pro Version | $10.99 | one-time |
| Pro Version | $11.99 | one-time |


### Interval Flow

[App page](https://appshunter.io/ios/app/interval-flow-wod-timer/id6444124987)

This app revolutionizes fitness routines with deep customization and advanced tracking for various activities like HIIT, Yoga, and CrossFit. It allows users to create, share, and follow personalized workouts with features like color-coded intervals, real-time progress tracking, and voice assistance.

**Highlights:** Color-coded intervals, Customizable circuits, Real-time progress tracking, Voice assist and search, Exercise library, Workout sharing

**Features:** macOS Compatibility

**In-app purchases (10)**

| Purchase | Price | Billing |
| --- | --- | --- |
| 3 Month | $4.99 | per 3 months |
| 1 Month | $9.99 | per month |
| 1 Month, 3 day trial | $9.99 | per month |
| Annual | $14.99 | per year |
| 1 Year discounted | $25.95 | per year |
| 1 Year, 3 day trial | $39.99 | per year |
| 1 Year | $39.99 | per year |
| 1 Year Intro month | $39.99 | per year |
| Free Lifetime subscription | Free | one-time |
| Lifetime | $24.99 | one-time |


## Frequently asked questions

### Is HIIT Workout Timer by Zafapp free?

HIIT Workout Timer by Zafapp is free to download, with in-app purchases available.

### Is Interval Flow free?

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

### Which has better reviews, HIIT Workout Timer by Zafapp or Interval Flow?

Interval Flow is rated higher. HIIT Workout Timer by Zafapp averages 4.5 out of 5 from 15 ratings, while Interval Flow averages 4.7 from 168 ratings.

### Do HIIT Workout Timer by Zafapp or Interval Flow have ads?

HIIT Workout Timer by Zafapp shows ads; Interval Flow does not.

### Which is updated more often, HIIT Workout Timer by Zafapp or Interval Flow?

HIIT Workout Timer by Zafapp ships an update every 3 weeks, and Interval Flow fortnightly. Most recently, HIIT Workout Timer by Zafapp was updated on August 23, 2026 and Interval Flow on September 5, 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.*