# Arc vs Principle

The clearest difference is in-app purchases: Arc at none against Principle's 4. Arc also leads on update cadence (every 2 days vs every 2 months). On price, ads, device support and iOS requirement there is nothing between them.

Both are free to download. Principle sells 4 one-off in-app purchases. Arc asks for nothing beyond the download.

Arc ships an update every 2 days, Principle every 2 months. The most recent releases landed on October 8, 2026 and October 24, 2026 respectively.

## The numbers

| Metric | Arc | Principle |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | **No** | Yes |
| Ads | Yes | Yes |
| Update frequency | **Every 2 days** | Every 2 months |
| Size | 29 MB | 57 MB |
| Requires iOS | 13.0 | 13.0 |
| Devices | iPhone, iPod | iPhone, iPod |
| Age rating | 17+ | 4+ |
| Developer | [kyeongju Moon](https://appshunter.io/developer/1878913458) | [주식회사 유자](https://appshunter.io/developer/1851710513) |

## What reviewers say

### Arc

[App page](https://appshunter.io/ios/app/arc/id6759481057)

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

**In-app purchases:** none


### Principle

[App page](https://appshunter.io/ios/app/principle-stock-backtest-sim/id6776831023)

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

**In-app purchases (4)**

| Purchase | Price | Billing |
| --- | --- | --- |
| 10 Tokens | $1.99 | one-time |
| 33 Tokens | $4.99 | one-time |
| 115 Tokens | $14.99 | one-time |
| 600 Tokens | $59.99 | one-time |


## Frequently asked questions

### Is Arc free?

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

### Is Principle free?

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

### Do Arc or Principle have ads?

Both Arc and Principle show ads.

### Which is updated more often, Arc or Principle?

Arc ships an update every 2 days, and Principle every 2 months. Most recently, Arc was updated on October 8, 2026 and Principle on October 24, 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.*