# Penn Mobile vs 66 Days

The clearest difference is in-app purchases: Penn Mobile at none against 66 Days's 2. 66 Days's advantage is rating (4.8 vs 4.6) and update cadence (every 10 days vs monthly). On price, review sentiment, ratings volume and ads there is nothing between them.

Both are free to download. 66 Days sells 2 in-app purchases, starting at $15.99 per month. Penn Mobile asks for nothing beyond the download.

66 Days holds the better App Store score, 4.8 against 4.6. Both are backed by a comparable volume of ratings — 410 and 259 respectively. Written reviews complicate that: 53% of Penn Mobile's written reviews are positive against 50% of 66 Days's, so the app with the better star average is not the one people write more warmly about.

Penn Mobile ships an update monthly, 66 Days every 10 days. The most recent releases landed on November 1, 2026 and November 5, 2026 respectively.

## The numbers

| Metric | Penn Mobile | 66 Days |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [4.6 (410 ratings)](https://appshunter.io/ios/app/penn-mobile/id944829399/reviews) | **[4.8 (259 ratings)](https://appshunter.io/ios/app/66-days-ai-interview-prep/id6752681422/reviews)** |
| Number of ratings | **410** | 259 |
| Positive reviews | **52.6% of reviews** | 50.0% of reviews |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Monthly | **Every 10 days** |
| Monetization | **Free** | Freemium |
| Size | 31 MB | 110 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) | [Uru Technologies, LLC](https://appshunter.io/developer/1840551197) |

## 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


### 66 Days

[App page](https://appshunter.io/ios/app/66-days-ai-interview-prep/id6752681422)

Master banking and consulting interviews with daily AI-powered practice. Track your progress on a 66-day journey with personalized feedback on technical, behavioral, and case questions. Improve your resume and gain confidence for top firms.

**Highlights:** AI interview coach with personalized feedback, Daily drills for behavioral, technical, and case questions, 66-day progress heat map, Resume checker, Excel and valuation tools, Analytics dashboard

**Features:** Vision Pro support

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| 66 Days Prep Pro | $15.99 | per month |
| 66 Days Prep Pro | $49.99 | per year |


## Frequently asked questions

### Is Penn Mobile free?

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

### Is 66 Days free?

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

### Which has better reviews, Penn Mobile or 66 Days?

66 Days is rated higher. Penn Mobile averages 4.6 out of 5 from 410 ratings, while 66 Days averages 4.8 from 259 ratings.

### Do Penn Mobile or 66 Days have ads?

Neither Penn Mobile nor 66 Days shows ads.

### Which is updated more often, Penn Mobile or 66 Days?

Penn Mobile ships an update monthly, and 66 Days every 10 days. Most recently, Penn Mobile was updated on November 1, 2026 and 66 Days on November 5, 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.*