# 21 Days vs ByeByeSugar!

The clearest difference is update cadence: ByeByeSugar! at every 5 days against 21 Days's every 3 weeks. 21 Days's advantage is iOS requirement (15.0 vs 17.6). 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 ByeByeSugar! sells 3 one-off in-app purchases. Whichever you choose, the download price is not the number that matters.

21 Days ships an update every 3 weeks, ByeByeSugar! every 5 days. The most recent releases landed on September 10, 2026 and September 14, 2026 respectively.

## The numbers

| Metric | 21 Days | ByeByeSugar! |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | Every 3 weeks | **Every 5 days** |
| Size | 42 MB | 7 MB |
| Requires iOS | **15.0** | 17.6 |
| Devices | **iPhone, iPod** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [iLoma Technology Private Limited](https://appshunter.io/developer/1463653289) | [Sezgin Ege](https://appshunter.io/developer/1547114333) |

## What reviewers say

### 21 Days

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


### ByeByeSugar!

[App page](https://appshunter.io/ios/app/byebyesugar/id6761415612)

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Starter Credits | $3.99 | one-time |
| Momentum Credits | $8.99 | one-time |
| Deep Run Credits | $14.99 | one-time |


## Frequently asked questions

### Is 21 Days free?

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

### Is ByeByeSugar! free?

ByeByeSugar! is free to download, with in-app purchases available.

### Do 21 Days or ByeByeSugar! have ads?

Neither 21 Days nor ByeByeSugar! shows ads.

### Which is updated more often, 21 Days or ByeByeSugar!?

21 Days ships an update every 3 weeks, and ByeByeSugar! every 5 days. Most recently, 21 Days was updated on September 10, 2026 and ByeByeSugar! on September 14, 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.*