# equivalence principle vs Statistics Solver

The clearest difference is in-app purchases: equivalence principle at none against Statistics Solver's 3. equivalence principle also leads on iOS requirement (16.0 vs 18.0). On price, ads and device support there is nothing between them.

Both are free to download. Statistics Solver sells 3 in-app purchases, starting at $6.99 per 7 days. equivalence principle asks for nothing beyond the download.

## The numbers

| Metric | equivalence principle | Statistics Solver |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | — | Every 5 weeks |
| Size | 0 MB | 8 MB |
| Requires iOS | **16.0** | 18.0 |
| Devices | **iPhone, iPad** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [Sungjun Kim](https://appshunter.io/developer/1602461985) | [Phuc Pham](https://appshunter.io/developer/1893081423) |

## What reviewers say

### equivalence principle

[App page](https://appshunter.io/ios/app/equivalence-principle/id6670335382)

**Features:** macOS Compatibility

**In-app purchases:** none


### Statistics Solver

[App page](https://appshunter.io/ios/app/statistics-solver-homework-ai/id6767797855)

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

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Weekly Premium | $6.99 | per 7 days |
| Annual Premium | $34.99 | per year |
| Lifetime Premium | $69.99 | one-time |


## Frequently asked questions

### Is equivalence principle free?

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

### Is Statistics Solver free?

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

### Do equivalence principle or Statistics Solver have ads?

Neither equivalence principle nor Statistics Solver shows ads.

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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.*