# OpenHIIT vs Surge

The clearest difference is price: OpenHIIT at Free against Surge's $2.99. OpenHIIT also leads on in-app purchases (none vs 1) and ratings volume (9 vs 1). On rating, update cadence, ads and device support there is nothing between them.

OpenHIIT is free to download; Surge costs $2.99 up front. Surge sells 1 one-off in-app purchase. OpenHIIT asks for nothing beyond the download.

On the App Store both sit at effectively the same score — 5.0 for OpenHIIT against 5.0 for Surge. That said, the two scores are not equally well evidenced: OpenHIIT has 9 ratings behind it against 1, so its average is the more settled of the two.

OpenHIIT ships an update monthly, Surge fortnightly. Both last shipped on October 24, 2026.

## The numbers

| Metric | OpenHIIT | Surge |
| --- | --- | --- |
| Price | **Free** | $2.99 |
| Rating | [5.0 (9 ratings)](https://appshunter.io/ios/app/openhiit/id6459617819/reviews) | [5.0 (1 ratings)](https://appshunter.io/ios/app/surge-interval-timer-and-hiit/id6762224044/reviews) |
| Number of ratings | **9** | 1 |
| Positive reviews | 100.0% of reviews | — |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Monthly | **Fortnightly** |
| Monetization | **Free** | Paid |
| Size | 26 MB | 1 MB |
| Requires iOS | **13.0** | 18.6 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Abigail Mabe](https://appshunter.io/developer/1701885217) | [Matthew Avery](https://appshunter.io/developer/1893424317) |

## What reviewers say

### OpenHIIT

[App page](https://appshunter.io/ios/app/openhiit/id6459617819)

This open-source interval timer app helps optimize various activities like workouts, work sprints, and study sessions. It offers customizable timing, precise controls, and clear auditory and visual alerts to keep you motivated and on track. Users can also join a collaborative community to contribute to its development.

**Highlights:** Customizable interval timing, Precise and user-friendly controls, Auditory and visual alerts, Open-source community collaboration, Ad-free experience

**Features:** macOS Compatibility

**In-app purchases:** none


### Surge

[App page](https://appshunter.io/ios/app/surge-interval-timer-and-hiit/id6762224044)

This interval timer app supports various workout styles like HIIT, Tabata, and boxing rounds. It offers customizable work/rest periods, round counts, and presets, with clear audio and haptic cues to guide your training without needing to watch the clock.

**Highlights:** Customizable work and rest periods, Adjustable round counts, Pre-set workout modes (HIIT, Tabata, Boxing), Audio and haptic cues, Save custom workout presets, Glanceable countdown timer

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Surge Pro | $0.99 | one-time |


## Frequently asked questions

### Is OpenHIIT free?

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

### Is Surge free?

Surge costs $2.99, and also offers in-app purchases.

### Which has better reviews, OpenHIIT or Surge?

OpenHIIT and Surge are both rated 5.0 out of 5 on the App Store, from 9 and 1 ratings respectively.

### Do OpenHIIT or Surge have ads?

Neither OpenHIIT nor Surge shows ads.

### Which is updated more often, OpenHIIT or Surge?

OpenHIIT ships an update monthly, and Surge fortnightly. Most recently, OpenHIIT was updated on October 24, 2026 and Surge on October 24, 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.*