# VMOOD vs 21 Days Challenge

The clearest difference is iOS requirement: 21 Days Challenge at 13.0 against VMOOD's 15.1. On price, update cadence, ads and in-app purchases there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

VMOOD ships an update every 3 weeks, 21 Days Challenge every 10 days. The most recent releases landed on October 6, 2026 and October 9, 2026 respectively.

## The numbers

| Metric | VMOOD | 21 Days Challenge |
| --- | --- | --- |
| Price | Free | Free |
| Positive reviews | 33.3% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 3 weeks | **Every 10 days** |
| Monetization | Free | — |
| Size | 43 MB | 46 MB |
| Requires iOS | 15.1 | **13.0** |
| Devices | iPhone, iPod | **iPhone, iPad, iPod** |
| Age rating | 17+ | 12+ |
| Developer | [Institute of Population, Health and Development](https://appshunter.io/developer/1464719946) | [Tung Bui Thanh](https://appshunter.io/developer/1504830403) |

## What reviewers say

### VMOOD

[App page](https://appshunter.io/ios/app/vmood/id1541983139)

This health app assists individuals in Vietnam with self-screening, management, and treatment referrals for depression. It aims to help users overcome depression and connect with specialists for professional support.

**Highlights:** Depression self-screening, Mood management tools, Treatment referral services, Connect with specialists, Support for users in Vietnam

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

**In-app purchases:** none


### 21 Days Challenge

[App page](https://appshunter.io/ios/app/21-days-challenge/id6753333556)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is VMOOD free?

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

### Is 21 Days Challenge free?

21 Days Challenge is free to download, with no in-app purchases.

### Do VMOOD or 21 Days Challenge have ads?

Neither VMOOD nor 21 Days Challenge shows ads.

### Which is updated more often, VMOOD or 21 Days Challenge?

VMOOD ships an update every 3 weeks, and 21 Days Challenge every 10 days. Most recently, VMOOD was updated on October 6, 2026 and 21 Days Challenge on October 9, 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.*