# Penn Mobile vs Uncertainty Calculator

The clearest difference is price: Penn Mobile at Free against Uncertainty Calculator's $3.99. Penn Mobile also leads on ratings volume (410 vs 1) and update cadence (monthly vs every 3 months). Uncertainty Calculator's advantage is rating (5.0 vs 4.6). On ads, in-app purchases, device support and iOS requirement there is nothing between them.

Penn Mobile is free to download; Uncertainty Calculator costs $3.99 up front. Neither carries in-app purchases, so what you see is what you pay.

Uncertainty Calculator holds the better App Store score, 5.0 against 4.6. That said, the two scores are not equally well evidenced: Penn Mobile has 410 ratings behind it against 1, so its average is the more settled of the two.

Penn Mobile ships an update monthly, Uncertainty Calculator every 3 months. The most recent releases landed on November 6, 2026 and November 2, 2026 respectively.

## The numbers

| Metric | Penn Mobile | Uncertainty Calculator |
| --- | --- | --- |
| Price | **Free** | $3.99 |
| Rating | [4.6 (410 ratings)](https://appshunter.io/ios/app/penn-mobile/id944829399/reviews) | **[5.0 (1 ratings)](https://appshunter.io/ios/app/uncertainty-calculator/id1170905440/reviews)** |
| Number of ratings | **410** | 1 |
| Positive reviews | 52.6% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Monthly** | Every 3 months |
| Monetization | **Free** | Paid |
| Size | 31 MB | 1 MB |
| Requires iOS | 17.6 | **17.0** |
| Devices | iPhone, iPad | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [University of Pennsylvania](https://appshunter.io/developer/437910363) | [Roman Volinsky](https://appshunter.io/developer/977951850) |

## What reviewers say

### Penn Mobile

[App page](https://appshunter.io/ios/app/penn-mobile/id944829399)

Streamline your campus experience with essential tools for student life. Access study room bookings, dining hall menus and hours, course schedules, and laundry machine availability. Quickly find fitness facility hours and emergency services.

**Highlights:** Study room booking, Dining hall hours and menus, Course schedule access, Laundry machine availability, Fitness facility hours, Emergency services access

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

**In-app purchases:** none

**What reviewers like**

- 👍 Very useful app for students
- 👍 Great interface
- 👍 Helpful for freshman/new students
- 👍 Convenient for dining hall menus
- 👍 Consolidates many student services

**What reviewers complain about**

- 🐛 Unable to log in
- 🐛 App crashes frequently
- 🐛 API connection issues
- 🐛 Data unavailable
- 🐛 App won't open

**Reported bugs**

- Unable to log in after Duo pop-up
- Cannot load dining halls or retail dining
- Unable to log in with PennKey
- App does not open after recent update
- App prompts to log in every time

**Requested features**

- Include fitness center hours
- Include building directory of campus
- Fix API connection issues
- Update app for better stability
- Fix login bugs


### Uncertainty Calculator

[App page](https://appshunter.io/ios/app/uncertainty-calculator/id1170905440)

This app allows users to perform error propagation calculations for mathematical expressions involving uncertain variables. It supports absolute and relative error inputs, various functions, and trigonometric calculations in degrees or radians. The tool helps ensure accurate reporting of results based on estimated errors.

**Highlights:** Error propagation calculations, Absolute and relative error input, Support for mathematical functions, Trigonometric calculations (degrees/radians), Variable combination in expressions, Significant figure guidance

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

**In-app purchases:** none


## Frequently asked questions

### Is Penn Mobile free?

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

### Is Uncertainty Calculator free?

Uncertainty Calculator costs $3.99, with no in-app purchases.

### Which has better reviews, Penn Mobile or Uncertainty Calculator?

Uncertainty Calculator is rated higher. Penn Mobile averages 4.6 out of 5 from 410 ratings, while Uncertainty Calculator averages 5.0 from 1 ratings.

### Do Penn Mobile or Uncertainty Calculator have ads?

Neither Penn Mobile nor Uncertainty Calculator shows ads.

### Which is updated more often, Penn Mobile or Uncertainty Calculator?

Penn Mobile ships an update monthly, and Uncertainty Calculator every 3 months. Most recently, Penn Mobile was updated on November 6, 2026 and Uncertainty Calculator on November 2, 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.*