# Sleep Data Recorder vs VO2Max Hiit Workout

The clearest difference is in-app purchases: VO2Max Hiit Workout at none against Sleep Data Recorder's 1. VO2Max Hiit Workout also leads on update cadence (every 10 days vs every 6 weeks). Sleep Data Recorder's advantage is ads (none vs shown) and iOS requirement (9.0 vs 15.6). On price and device support there is nothing between them.

Both are free to download. Sleep Data Recorder sells 1 one-off in-app purchase. VO2Max Hiit Workout asks for nothing beyond the download.

Sleep Data Recorder ships an update every 6 weeks, VO2Max Hiit Workout every 10 days. The most recent releases landed on June 9, 2026 and September 16, 2026 respectively.

## The numbers

| Metric | Sleep Data Recorder | VO2Max Hiit Workout |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[2.5 (2 ratings)](https://appshunter.io/ios/app/sleep-data-recorder/id1135221863/reviews)** | — |
| Number of ratings | **2** | — |
| In-app purchases | Yes | **No** |
| Ads | **No** | Yes |
| Update frequency | Every 6 weeks | **Every 10 days** |
| Monetization | Free with in-app purchases | — |
| Size | 2 MB | 104 MB |
| Requires iOS | **9.0** | 15.6 |
| Devices | iPhone, iPod, Apple Watch | iPhone, iPad, iPod |
| Age rating | 4+ | 12+ |
| Developer | [JOHN BURKE](https://appshunter.io/developer/1082153101) | [Unscripted Engineering](https://appshunter.io/developer/1635849108) |

## What reviewers say

### Sleep Data Recorder

[App page](https://appshunter.io/ios/app/sleep-data-recorder/id1135221863)

Effortlessly track your sleep patterns and daily body weight by logging your bedtime and wake-up times. The app automatically calculates your time in bed and asleep, and syncs data with Apple's HealthKit for easy monitoring of your health progress.

**Highlights:** Sleep pattern monitoring, Body weight logging, Automatic time calculation, HealthKit integration, Simple one-button entry

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Weight Recorder Full Access | $0.99 | one-time |


### VO2Max Hiit Workout

[App page](https://appshunter.io/ios/app/vo2max-hiit-workout/id6475713309)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Sleep Data Recorder free?

Sleep Data Recorder is free to download, with in-app purchases available.

### Is VO2Max Hiit Workout free?

VO2Max Hiit Workout is free to download, with no in-app purchases.

### Do Sleep Data Recorder or VO2Max Hiit Workout have ads?

VO2Max Hiit Workout shows ads; Sleep Data Recorder does not.

### Which is updated more often, Sleep Data Recorder or VO2Max Hiit Workout?

Sleep Data Recorder ships an update every 6 weeks, and VO2Max Hiit Workout every 10 days. Most recently, Sleep Data Recorder was updated on June 9, 2026 and VO2Max Hiit Workout on September 16, 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.*