Usage Log vs 21DaysOfChange
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Usage Log
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.
- Track daily iPhone usage
- Monitor screen time
- Receive relaxation reminders
- Parental monitoring
- Data saved locally on iPhone
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Usage Log will let you know how long you spend on your iPhone everyday. Usage Log will let you know when you or someone has used your iPhone. Usage Log will remind you to relax when you have been playing with your iPhone for the preset time interval to protect your eyesight. Usage Log will be useful for your life. Usage Log will also be helpful for parents who want to know how often their children are using their iPhone. PRIVACY STATEMENT: All the data collected by Usage Log will only be saved on your iPhone, and will be deleted permanently with the app. You can access the data by copying the three data files via iTunes.
21DaysOfChange
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With our clear guidance and a bit of fun, we'll help you transform your habits into something you can be proud of. Imagine growing a tree - starting small, nurturing it daily, and watching it flourish. In just 21 days, you'll cultivate a new habit with tips and strategies that will last a lifetime. Join us on this transformative journey and take control of your lifestyle, one habit at a time. Terms Of Use: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/ Privacy Policy: https://www.21daysofchange.app/privacypolicy
Screenshots
Verdict
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.
Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS
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.
| Parameter | Usage Log | 21DaysOfChange |
|---|---|---|
| Price | Free | Free |
| Rating | 2.4 (8 ratings) — better | — |
| Positive reviews | 29.4% of reviews | — |
| Number of ratings | 8 — better | — |
| Update frequency | Every 3 months — better | Every 9 months |
| Ads | No | No |
| In-app purchases | No — better | Yes |
| Monetization | Free | — |
| Devices | iPhone, iPod | iPhone, iPad |
| Requires iOS | 7.0 — better | 16.4 |
| Further details — not scored | ||
| Size | 1 MB | 59 MB |
| Age rating | 4+ | 4+ |
| Developer | 志明 丁 | Hong Son Vu |
In-app purchases
Usage Log
No in-app purchases
21DaysOfChange
- 21DaysOfChange Monthly Premium$5.991 Month
- 21DaysOfChange Monthly Business$17.991 Month
- 21DaysOfChange Yearly Premium$71.991 Year
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- 21DaysOfChange Yearly Business$214.991 Year
