# 21 Days vs Screen Time Control

The clearest difference is update cadence: Screen Time Control at every 2 days against 21 Days's every 3 weeks. 21 Days's advantage is iOS requirement (15.0 vs 18.0). On price, ads, in-app purchases and device support there is nothing between them.

Both are free to download. 21 Days sells 4 in-app purchases, starting at $0.99 per month and Screen Time Control sells 3 in-app purchases, starting at $9.99 per month. Whichever you choose, the download price is not the number that matters.

21 Days ships an update every 3 weeks, Screen Time Control every 2 days. The most recent releases landed on October 30, 2026 and October 7, 2026 respectively.

## The numbers

| Metric | 21 Days | Screen Time Control |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[5.0 (1 ratings)](https://appshunter.io/ios/app/screen-time-control-locklive/id6781304129/reviews)** |
| Number of ratings | — | **1** |
| Positive reviews | — | 100.0% of reviews |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | Every 3 weeks | **Every 2 days** |
| Monetization | — | Freemium |
| Size | 46 MB | 116 MB |
| Requires iOS | **15.0** | 18.0 |
| Devices | **iPhone, iPod** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [iLoma Technology](https://appshunter.io/developer/1463653289) | [John Engleman](https://appshunter.io/developer/1876088726) |

## What reviewers say

### 21 Days

[App page](https://appshunter.io/ios/app/21-days-habit-tracker/id6751798974)

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

**In-app purchases (4)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Pro Monthly | $0.99 | per month |
| Ultra Pro Monthly | $0.99 | per month |
| Pro Yearly | $4.99 | per year |
| Ultra Pro Yearly | $9.99 | per year |


### Screen Time Control

[App page](https://appshunter.io/ios/app/screen-time-control-locklive/id6781304129)

This app helps you build healthy habits by locking distracting apps until your goals are met. It uses photo proof for habit verification and offers a personalized visual world to motivate your progress. Rest days are accommodated without breaking your momentum.

**Highlights:** App blocking until habits are completed, Photo proof for habit verification, Customizable habit enforcement, Progress tracking that forgives missed days, AI-generated personalized visual worlds, On-device privacy for all data

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

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Sona Habits Pro (Monthly) | $9.99 | per month |
| Sona Habits Pro (Yearly) | $49.99 | per year |
| 50 Painting Credits | $4.99 | one-time |


## Frequently asked questions

### Is 21 Days free?

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

### Is Screen Time Control free?

Screen Time Control is free to download, with in-app purchases available.

### Do 21 Days or Screen Time Control have ads?

Neither 21 Days nor Screen Time Control shows ads.

### Which is updated more often, 21 Days or Screen Time Control?

21 Days ships an update every 3 weeks, and Screen Time Control every 2 days. Most recently, 21 Days was updated on October 30, 2026 and Screen Time Control on October 7, 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.*