# Universal Principles vs Re

The clearest difference is in-app purchases: Universal Principles at none against Re's 3. Universal Principles also leads on device support (3 vs 1) and iOS requirement (11.0 vs 16.2). On price and ads there is nothing between them.

Both are free to download. Re sells 3 one-off in-app purchases. Universal Principles asks for nothing beyond the download.

## The numbers

| Metric | Universal Principles | Re |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[5.0 (10 ratings)](https://appshunter.io/ios/app/remind-app/id6446973178/reviews)** |
| Number of ratings | — | **10** |
| Positive reviews | — | 100.0% of reviews |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | — | Every 13 months |
| Monetization | — | Free with in-app purchases |
| Size | 12 MB | 8 MB |
| Requires iOS | **11.0** | 16.2 |
| Devices | **iPhone, iPad, iPod** | iPhone |
| Age rating | 17+ | 4+ |
| Developer | [Mind Body Aware Games LLC](https://appshunter.io/developer/1018615903) | [Juan Carlos Pineiro-Escoriaza](https://appshunter.io/developer/1679280996) |

## What reviewers say

### Universal Principles

[App page](https://appshunter.io/ios/app/universal-principles/id1613390887)

**Features:** macOS Compatibility

**In-app purchases:** none


### Re

[App page](https://appshunter.io/ios/app/remind-app/id6446973178)

Access a curated collection of mental models to enhance problem-solving, creativity, and decision-making. Learn practical applications and discover new perspectives daily. Ideal for students, professionals, and lifelong learners seeking to upgrade their thinking.

**Highlights:** Curated mental models, Practical application examples, Save favorite models, Daily mental model widget, Cross-disciplinary search, Customizable themes

**Features:** Family Sharing

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Monthly Plan | $9.99 | one-time |
| Re:Mind App Upgrade | $34.99 | one-time |
| Annual Plan | $89.99 | one-time |


## Frequently asked questions

### Is Universal Principles free?

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

### Is Re free?

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

### Do Universal Principles or Re have ads?

Neither Universal Principles nor Re 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.*