# RocketDip vs Principle

The clearest difference is update cadence: Principle at every 10 days against RocketDip's every 4 weeks. Principle also leads on iOS requirement (13.0 vs 26.2). On price, ads, in-app purchases and device support there is nothing between them.

Both are free to download. RocketDip sells 1 one-off in-app purchase and Principle sells 4 one-off in-app purchases. Whichever you choose, the download price is not the number that matters.

RocketDip ships an update every 4 weeks, Principle every 10 days. Both last shipped on September 10, 2026.

## The numbers

| Metric | RocketDip | Principle |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | Yes | Yes |
| Ads | Yes | Yes |
| Update frequency | Every 4 weeks | **Every 10 days** |
| Size | 6 MB | 49 MB |
| Requires iOS | 26.2 | **13.0** |
| Devices | iPhone, iPad | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Alan Haley](https://appshunter.io/developer/1886546849) | [주식회사 유자](https://appshunter.io/developer/1851710513) |

## What reviewers say

### RocketDip

[App page](https://appshunter.io/ios/app/rocketdip/id6760856753)

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Remove Ads | $1.99 | one-time |


### 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 RocketDip free?

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

### Is Principle free?

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

### Do RocketDip or Principle have ads?

Both RocketDip and Principle show ads.

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

RocketDip ships an update every 4 weeks, and Principle every 10 days. Most recently, RocketDip was updated on September 10, 2026 and Principle on September 10, 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.*