# Virtual Heart vs Intervals Pro

The clearest difference is rating: Intervals Pro at 4.8 against Virtual Heart's 3.5. Intervals Pro also leads on update cadence (every 8 days vs every 5 months) and ratings volume (14K vs 24). Virtual Heart's advantage is in-app purchases (none vs 8) and iOS requirement (4.0 vs 17.5). On price and ads there is nothing between them.

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

Intervals Pro holds the better App Store score, 4.8 against 3.5. That said, the two scores are not equally well evidenced: Intervals Pro has 14K ratings behind it against 24, so its average is the more settled of the two. Written reviews point the same way: 67% of Virtual Heart's written reviews are positive against 84% of Intervals Pro's.

Virtual Heart ships an update every 5 months, Intervals Pro every 8 days. The most recent releases landed on September 29, 2026 and October 15, 2026 respectively.

## The numbers

| Metric | Virtual Heart | Intervals Pro |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [3.5 (24 ratings)](https://appshunter.io/ios/app/virtual-heart/id501539525/reviews) | **[4.8 (14K ratings)](https://appshunter.io/ios/app/intervals-pro-hiit-timer/id957586938/reviews)** |
| Number of ratings | 24 | **14K** |
| Positive reviews | 66.7% of reviews | **84.3% of reviews** |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 5 months | **Every 8 days** |
| Monetization | **Free** | Free with in-app purchases |
| Size | 62 MB | 69 MB |
| Requires iOS | **4.0** | 17.5 |
| Devices | iPad | **iPhone, iPad, Apple Watch** |
| Age rating | 4+ | 4+ |
| Developer | [Museum of Science and Industry, Chicago](https://appshunter.io/developer/501539528) | [Intervals, LLC](https://appshunter.io/developer/331071662) |

## What reviewers say

### Virtual Heart

[App page](https://appshunter.io/ios/app/virtual-heart/id501539525)

Explore a realistic, animated human heart with multiple internal and external views. Adjust heart rate, view blood flow, and learn about the circulatory system through interactive labels and information.

**Highlights:** Realistic animated heart model, External and internal views, Adjustable heart rate, Blood flow and electrical system visualization, Interactive key labels, Educational information

**Features:** macOS Compatibility

**In-app purchases:** none


### 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


## Frequently asked questions

### Is Virtual Heart free?

Virtual Heart is free to download, with no in-app purchases.

### Is Intervals Pro free?

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

### Which has better reviews, Virtual Heart or Intervals Pro?

Intervals Pro is rated higher. Virtual Heart averages 3.5 out of 5 from 24 ratings, while Intervals Pro averages 4.8 from 14K ratings.

### Do Virtual Heart or Intervals Pro have ads?

Neither Virtual Heart nor Intervals Pro shows ads.

### Which is updated more often, Virtual Heart or Intervals Pro?

Virtual Heart ships an update every 5 months, and Intervals Pro every 8 days. Most recently, Virtual Heart was updated on September 29, 2026 and Intervals Pro on October 15, 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.*