# Intervals Pro vs HIIT 4x4 Lite

The clearest difference is in-app purchases: HIIT 4x4 Lite at none against Intervals Pro's 8. HIIT 4x4 Lite also leads on rating (5.0 vs 4.8) and iOS requirement (12.0 vs 17.5). Intervals Pro's advantage is update cadence (every 8 days vs every 25 months) and ratings volume (14K vs 2). On price, ads and device support there is nothing between them.

Both are free to download. Intervals Pro sells 8 in-app purchases, starting at $2.99 per month. HIIT 4x4 Lite asks for nothing beyond the download.

HIIT 4x4 Lite holds the better App Store score, 5.0 against 4.8. That said, the two scores are not equally well evidenced: Intervals Pro has 14K ratings behind it against 2, so its average is the more settled of the two. Written reviews complicate that: 84% of Intervals Pro's written reviews are positive against 67% of HIIT 4x4 Lite's, so the app with the better star average is not the one people write more warmly about.

Intervals Pro ships an update every 8 days, HIIT 4x4 Lite every 25 months. The most recent releases landed on October 25, 2026 and October 7, 2026 respectively.

## The numbers

| Metric | Intervals Pro | HIIT 4x4 Lite |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [4.8 (14K ratings)](https://appshunter.io/ios/app/intervals-pro-hiit-timer/id957586938/reviews) | **[5.0 (2 ratings)](https://appshunter.io/ios/app/hiit-4x4-lite/id1558498996/reviews)** |
| Number of ratings | **14K** | 2 |
| Positive reviews | **84.3% of reviews** | 66.7% of reviews |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | **Every 8 days** | Every 25 months |
| Monetization | Free with in-app purchases | **Free** |
| Size | 65 MB | 18 MB |
| Requires iOS | 17.5 | **12.0** |
| Devices | iPhone, iPad, Apple Watch | iPhone, iPod, Apple Watch |
| Age rating | 4+ | 4+ |
| Developer | [Intervals, LLC](https://appshunter.io/developer/331071662) | [Eastridge Technology](https://appshunter.io/developer/392920417) |

## What reviewers say

### Intervals Pro

[App page](https://appshunter.io/ios/app/intervals-pro-hiit-timer/id957586938)

Create and follow custom interval training routines for various fitness activities. This app offers extensive customization for intervals, alerts, and goals, with seamless integration for Apple Watch and Apple Health.

**Highlights:** Highly customizable intervals (time/distance), Spoken interval names and prompts, Standalone Apple Watch workouts, Workout history with Apple Health, Home screen widgets for quick launch, Bluetooth heart rate monitor support, Siri Shortcuts integration

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

**In-app purchases (8)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Monthly Membership | $2.99 | per month |
| Yearly Membership | $19.99 | per year |
| Generous Tip | $0.99 | one-time |
| Awesome Tip | $1.99 | one-time |
| Massive Tip | $4.99 | one-time |
| Amazing Tip | $9.99 | one-time |
| Intervals Pro (Legacy) | $69.99 | one-time |
| Lifetime Access | $69.99 | one-time |

**What reviewers like**

- 👍 Customizable timers and intervals
- 🚀 Seamless Apple Watch integration
- 💪 Helps with fitness goals and training
- 🔍 Detailed workout tracking and analytics
- 🎨 Intuitive and user-friendly interface

**What reviewers complain about**

- 🐛 Occasional sync and connectivity issues
- 🔍 Lack of clear guidance and documentation
- 💰 Paid version required for full functionality

**Reported bugs**

- Workout data not syncing correctly
- App crashes or freezes on certain devices

**Requested features**

- More customization options for interval displays
- Ability to batch delete or manage workout history
- Integration with more third-party fitness apps


### HIIT 4x4 Lite

[App page](https://appshunter.io/ios/app/hiit-4x4-lite/id1558498996)

This app guides you through High Intensity Interval Training (HIIT) workouts using your heart rate as a guide. It sequences exercise between high and low intensity intervals, displaying your progress on a speedometer-style dial. Warning chimes alert you if your heart rate falls outside the target zone.

**Highlights:** High Intensity Interval Training (HIIT) guidance, Heart rate monitoring based on MHR percentage, Speedometer-style heart rate dial, Warning chimes for out-of-range heart rate, Based on NTNU's 4x4 HIIT program

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Intervals Pro free?

Intervals Pro is free to download, with in-app purchases available.

### Is HIIT 4x4 Lite free?

HIIT 4x4 Lite is free to download, with no in-app purchases.

### Which has better reviews, Intervals Pro or HIIT 4x4 Lite?

HIIT 4x4 Lite is rated higher. Intervals Pro averages 4.8 out of 5 from 14K ratings, while HIIT 4x4 Lite averages 5.0 from 2 ratings.

### Do Intervals Pro or HIIT 4x4 Lite have ads?

Neither Intervals Pro nor HIIT 4x4 Lite shows ads.

### Which is updated more often, Intervals Pro or HIIT 4x4 Lite?

Intervals Pro ships an update every 8 days, and HIIT 4x4 Lite every 25 months. Most recently, Intervals Pro was updated on October 25, 2026 and HIIT 4x4 Lite on October 7, 2026.

---

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