# Hundred Day Challenge vs Two

The clearest difference is update cadence: Two at every 3 weeks against Hundred Day Challenge's every 9 months. Two also leads on iOS requirement (16.4 vs 18.5). On price, ads, in-app purchases and device support there is nothing between them.

Both are free to download. Hundred Day Challenge sells 1 one-off in-app purchase and Two sells 2 in-app purchases, starting at $0.99 per month. Whichever you choose, the download price is not the number that matters.

Hundred Day Challenge ships an update every 9 months, Two every 3 weeks. The most recent releases landed on November 5, 2026 and October 28, 2026 respectively.

## The numbers

| Metric | Hundred Day Challenge | Two |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.7 (3 ratings)](https://appshunter.io/ios/app/hundred-day-challenge/id6749242232/reviews)** | — |
| Number of ratings | **3** | — |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | Every 9 months | **Every 3 weeks** |
| Monetization | Free with in-app purchases | — |
| Size | 2 MB | 83 MB |
| Requires iOS | 18.5 | **16.4** |
| Devices | iPhone, iPad | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Urs Jaeggi](https://appshunter.io/developer/1709239048) | [Kristian Goshi](https://appshunter.io/developer/1893867798) |

## What reviewers say

### Hundred Day Challenge

[App page](https://appshunter.io/ios/app/hundred-day-challenge/id6749242232)

This app helps you build lasting habits and achieve goals through consistent, small daily actions over 100 days. Track multiple challenges simultaneously, visualize your progress, and stay motivated with visual cues and milestone rewards.

**Highlights:** Multiple challenges at once, Daily completion tracking, Progress visualization, Motivating main screen, Icon selection per challenge, Progress rewards

**Features:** macOS Compatibility, Family Sharing

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Full Version | $0.99 | one-time |


### Two

[App page](https://appshunter.io/ios/app/two-day-rule/id6782057750)

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

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Monthly subscription | $0.99 | per month |
| Yearly subscription | $5.99 | per year |


## Frequently asked questions

### Is Hundred Day Challenge free?

Hundred Day Challenge is free to download, with in-app purchases available.

### Is Two free?

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

### Do Hundred Day Challenge or Two have ads?

Neither Hundred Day Challenge nor Two shows ads.

### Which is updated more often, Hundred Day Challenge or Two?

Hundred Day Challenge ships an update every 9 months, and Two every 3 weeks. Most recently, Hundred Day Challenge was updated on November 5, 2026 and Two on October 28, 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.*