# Under Siege vs RankZero

The clearest difference is in-app purchases: RankZero at none against Under Siege's 2. On price, update cadence, ads and device support there is nothing between them.

Both are free to download. Under Siege sells 2 in-app purchases, starting at $5.99 per month. RankZero asks for nothing beyond the download.

Under Siege ships an update every 2 days, RankZero every 3 days. The most recent releases landed on October 14, 2026 and October 16, 2026 respectively.

## The numbers

| Metric | Under Siege | RankZero |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[4.0 (1 ratings)](https://appshunter.io/ios/app/rankzero-self-discipline/id6797990941/reviews)** |
| Number of ratings | — | **1** |
| In-app purchases | Yes | **No** |
| Ads | Yes | Yes |
| Update frequency | **Every 2 days** | Every 3 days |
| Monetization | — | Free with in-app purchases |
| Size | 151 MB | 303 MB |
| Requires iOS | 16.4 | 16.4 |
| Devices | iPhone | iPhone |
| Age rating | 12+ | 12+ |
| Developer | [Apps That Care OU](https://appshunter.io/developer/1838304932) | [OriKone LLC](https://appshunter.io/developer/1896066551) |

## What reviewers say

### Under Siege

[App page](https://appshunter.io/ios/app/under-siege-workout-rpg/id6794355454)

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

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Under Siege Premium (Monthy) | $5.99 | per month |
| Under Siege Premium (Yearly) | $29.99 | per year |


### RankZero

[App page](https://appshunter.io/ios/app/rankzero-self-discipline/id6797990941)

Build discipline through daily habits and track your progress with a unique character leveling system. Engage in guided skill sprints and compete with friends in weekly leagues. Offers a free tier with core features and a Pro subscription for advanced tools.

**Highlights:** Daily habit tracking, Streak building, Gamified character progression, Guided skill sprints, Friend accountability and leagues, Forgiveness mechanic for missed days

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

**In-app purchases:** none


## Frequently asked questions

### Is Under Siege free?

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

### Is RankZero free?

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

### Do Under Siege or RankZero have ads?

Both Under Siege and RankZero show ads.

### Which is updated more often, Under Siege or RankZero?

Under Siege ships an update every 2 days, and RankZero every 3 days. Most recently, Under Siege was updated on October 14, 2026 and RankZero on October 16, 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.*