# Usage Log vs 21DaysOfChange

The clearest difference is in-app purchases: Usage Log at none against 21DaysOfChange's 4. Usage Log also leads on update cadence (every 3 months vs every 9 months) and iOS requirement (7.0 vs 16.4). On price, ads and device support there is nothing between them.

Both are free to download. 21DaysOfChange sells 4 in-app purchases, starting at $5.99 per month. Usage Log asks for nothing beyond the download.

Usage Log ships an update every 3 months, 21DaysOfChange every 9 months. The most recent releases landed on October 5, 2026 and September 18, 2026 respectively.

## The numbers

| Metric | Usage Log | 21DaysOfChange |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[2.4 (8 ratings)](https://appshunter.io/ios/app/usage-log/id887870065/reviews)** | — |
| Number of ratings | **8** | — |
| Positive reviews | 29.4% of reviews | — |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | **Every 3 months** | Every 9 months |
| Monetization | Free | — |
| Size | 1 MB | 59 MB |
| Requires iOS | **7.0** | 16.4 |
| Devices | iPhone, iPod | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [志明 丁](https://appshunter.io/developer/1180487353) | [Hong Son Vu](https://appshunter.io/developer/1767993431) |

## What reviewers say

### Usage Log

[App page](https://appshunter.io/ios/app/usage-log/id887870065)

Track your daily iPhone usage and receive reminders to take breaks, helping to protect your eyesight. It's also a useful tool for parents monitoring their children's screen time.

**Highlights:** Track daily iPhone usage, Monitor screen time, Receive relaxation reminders, Parental monitoring, Data saved locally on iPhone

**Features:** Vision Pro support

**In-app purchases:** none


### 21DaysOfChange

[App page](https://appshunter.io/ios/app/21daysofchange/id6677019535)

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

**In-app purchases (4)**

| Purchase | Price | Billing |
| --- | --- | --- |
| 21DaysOfChange Monthly Premium | $5.99 | per month |
| 21DaysOfChange Monthly Business | $17.99 | per month |
| 21DaysOfChange Yearly Premium | $71.99 | per year |
| 21DaysOfChange Yearly Business | $214.99 | per year |


## Frequently asked questions

### Is Usage Log free?

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

### Is 21DaysOfChange free?

21DaysOfChange is free to download, with in-app purchases available.

### Do Usage Log or 21DaysOfChange have ads?

Neither Usage Log nor 21DaysOfChange shows ads.

### Which is updated more often, Usage Log or 21DaysOfChange?

Usage Log ships an update every 3 months, and 21DaysOfChange every 9 months. Most recently, Usage Log was updated on October 5, 2026 and 21DaysOfChange on September 18, 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.*