# Simple Interval Workout Timer vs PeakO₂

The clearest difference is in-app purchases: Simple Interval Workout Timer at none against PeakO₂'s 4. Simple Interval Workout Timer also leads on ads (none vs shown) and iOS requirement (9.0 vs 17.6). PeakO₂'s advantage is update cadence (monthly vs every 4 months) and rating (4.9 vs 4.7). On price, ratings volume and device support there is nothing between them.

Both are free to download. PeakO₂ sells 4 in-app purchases, starting at $0.99 per 7 days. Simple Interval Workout Timer asks for nothing beyond the download.

PeakO₂ holds the better App Store score, 4.9 against 4.7. Both are backed by a comparable volume of ratings — 7 and 13 respectively.

Simple Interval Workout Timer ships an update every 4 months, PeakO₂ monthly. The most recent releases landed on October 11, 2026 and September 22, 2026 respectively.

## The numbers

| Metric | Simple Interval Workout Timer | PeakO₂ |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [4.7 (7 ratings)](https://appshunter.io/ios/app/simple-interval-workout-timer/id1605830698/reviews) | **[4.9 (13 ratings)](https://appshunter.io/ios/app/peako-stamina-and-breath-guide/id6739490313/reviews)** |
| Number of ratings | 7 | **13** |
| Positive reviews | 100.0% of reviews | — |
| In-app purchases | **No** | Yes |
| Ads | **No** | Yes |
| Update frequency | Every 4 months | **Monthly** |
| Monetization | **Free** | Free with in-app purchases |
| Size | 53 MB | 24 MB |
| Requires iOS | **9.0** | 17.6 |
| Devices | iPhone, iPod | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Artur Fijal](https://appshunter.io/developer/1446213931) | [OriginX](https://appshunter.io/developer/1725593771) |

## What reviewers say

### Simple Interval Workout Timer

[App page](https://appshunter.io/ios/app/simple-interval-workout-timer/id1605830698)

This app provides a simple, intuitive timer for various interval training methods like Tabata, HIIT, and EMOM. It allows users to save unlimited custom workouts for free, making fitness routines more efficient and accessible.

**Highlights:** Interval training timer, Supports Tabata, HIIT, EMOM, Save unlimited workouts, Minimalistic UI, Readable from a distance, Ad-free experience

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

**In-app purchases:** none


### PeakO₂

[App page](https://appshunter.io/ios/app/peako-stamina-and-breath-guide/id6739490313)

Enhance your breath control and oxygen efficiency with structured exercises. This app offers personalized training plans, guided sessions, and progress tracking for improved physical and mental endurance. Suitable for athletes, freedivers, and anyone looking to master their breath.

**Highlights:** Personalized O₂ training plans, Customizable breath-hold start time, Guided breath-hold sessions, Visual and audio cues, Progress tracking and milestones, Minimalist and intuitive design

**Features:** macOS Compatibility

**In-app purchases (4)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Weekly | $0.99 | per 7 days |
| Monthly | $3.99 | per month |
| Yearly | $17.99 | per year |
| Lifetime | $29.99 | one-time |


## Frequently asked questions

### Is Simple Interval Workout Timer free?

Simple Interval Workout Timer is free to download, with no in-app purchases.

### Is PeakO₂ free?

PeakO₂ is free to download, with in-app purchases available.

### Which has better reviews, Simple Interval Workout Timer or PeakO₂?

PeakO₂ is rated higher. Simple Interval Workout Timer averages 4.7 out of 5 from 7 ratings, while PeakO₂ averages 4.9 from 13 ratings.

### Do Simple Interval Workout Timer or PeakO₂ have ads?

PeakO₂ shows ads; Simple Interval Workout Timer does not.

### Which is updated more often, Simple Interval Workout Timer or PeakO₂?

Simple Interval Workout Timer ships an update every 4 months, and PeakO₂ monthly. Most recently, Simple Interval Workout Timer was updated on October 11, 2026 and PeakO₂ on September 22, 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.*