Penn Mobile vs 66 Days
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Penn Mobile
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.
- Study room booking
- Dining hall hours and menus
- Course schedule access
- Laundry machine availability
- Fitness facility hours
- Emergency services access
Read full descriptionHide full description
Study room booking, dining hall hours, course schedule, daily menus, laundry machine accessibility, fitness facility hours, and quick access to emergency services! Penn Mobile was designed by students in Penn Labs with the intention of making your school life simpler. What does this mean? No more carrying your laundry four floors up trying to find a laundry machine. No more hunting for dining hall hours on the web. And no more struggles trying to book a study room. You can now do it all at the press of a button. Enjoy!
66 Days
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.
- 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
Read full descriptionHide full description
66 Days Prep is an AI-powered career preparation platform designed to help candidates master interviews for banking and consulting roles through structured, daily progress. The app combines personalized coaching, habit tracking, and analytics to transform your preparation into a consistent 66-day journey. Each day you’ll train across behavioral, technical, cases or market-based questions while receiving instant feedback from an AI coach. The goal is simple — make interview mastery a daily habit. Your progress is visualized through a 66-day heat map that tracks consistency, focus, and improvement. Every session compounds your learning so that when interview season arrives, you’re confident, sharp, and ready to perform. Key features: • AI interview coach for personalized feedback on real questions • Daily drills in behavioral, technical, cases, and market news • 66-day heat map that tracks performance and consistency • Resume checker to strengthen clarity and impact • Excel and valuation tools for technical accuracy • Productivity features including timers and streak reminders • Analytics dashboard that highlights your growth over time Built by former bankers and consultants, 66 Days Prep mirrors real recruiting standards at leading firms such as Goldman Sachs, Morgan Stanley, McKinsey, and Bain. The app ensures that every minute spent practicing is focused on what matters most — structured thinking, confident delivery, and business intuition. Whether you are recruiting for your first internship, preparing for post-graduate consulting interviews, or advancing your career in finance, 66 Days Prep provides a disciplined path to daily improvement. Consistency is what separates good candidates from great ones. 66 Days Prep helps you build that consistency through smart repetition, clear feedback, and visible progress you can track. Build momentum, develop confidence, and master your interviews with 66 Days Prep — your AI career partner for banking and consulting success. Some features, including the AI interview coach, require a subscription. Please review our Privacy Policy at https://www.66daysprep.com/privacy. By using this app, you agree to the terms outlined in https://www.66daysprep.com/terms and https://www.apple.com/legal/internet-services/itunes/dev/stdeula/.
Screenshots
Verdict
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.
Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS
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.
| Parameter | Penn Mobile | 66 Days |
|---|---|---|
| Price | Free | Free |
| Rating | 4.6 (410 ratings) | 4.8 (259 ratings) — better |
| Positive reviews | 52.6% of reviews — better | 50.0% of reviews |
| Number of ratings | 410 — better | 259 |
| Update frequency | Monthly | Every 10 days — better |
| Ads | No | No |
| In-app purchases | No — better | Yes |
| Monetization | Free — better | Freemium |
| Devices | iPhone, iPad | iPhone, iPad |
| Requires iOS | 17.6 | 17.0 — better |
| Further details — not scored | ||
| Size | 31 MB | 110 MB |
| Age rating | 4+ | 4+ |
| Developer | University of Pennsylvania | Uru Technologies, LLC |
Customer experience
Penn Mobile
66 Days
Bugs and requests
Penn Mobile
Reported bugs
9 issues- 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
Show 4 moreShow fewer
- App does not save login after exiting
- Pop-up message: "Couldn't connect to API"
- App crashes frequently
- Dining hall information is incorrect or not shown
Requested features
6 requests- Include fitness center hours
- Include building directory of campus
- Fix API connection issues
- Update app for better stability
- Fix login bugs
Show 1 moreShow fewer
- Improve login persistence
66 Days
Not enough reviews yet to summarise bugs or requests.
In-app purchases
Penn Mobile
No in-app purchases
66 Days
- 66 Days Prep Pro$15.991 Month
- 66 Days Prep Pro$49.991 Year









