Comparison

66 Days vs FiveMinuteFox

Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.

Head to head
About

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.

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
Read 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/.

About

FiveMinuteFox

Enhance your financial acumen with daily mental math exercises. Designed by a finance professional, this app offers progressive levels of practice to improve your calculation speed and accuracy for business contexts. Unlock advanced levels and features with a premium subscription.

Highlights
  • Daily mental math practice
  • 30 progressive difficulty levels
  • Specialized business context problems
  • Detailed solution explanations
  • Practice Mode for targeted skills
  • Streak tracking
Features
Read full description

22 of 30 levels free, no ads, no account required. Just open, play, and feel smarter at work and interviews, size up deals in real-time at lunch meetings, on the golf course, or at conferences. Built by a finance professional with 24 years of experience who has interviewed hundreds of analyst candidates. This is the daily mental math training that separates confident business leaders from everyone else. HOW IT WORKS Complete questions daily whenever you have 5 minutes. The app starts at Level 1 each day as a warm-up, then automatically progresses through 30 levels of increasingly challenging content. 30 PROGRESSIVE LEVELS • Levels 1-5: Arithmetic warm-up and multiplication up to 20x20 • Levels 6-10: Progressive multiplication practice • Level 11: Addition estimation • Levels 12-20: Progressive division practice and percentages • Levels 21-22: Hard multiplication and division • Levels 23-30: Specialized business context practice, including corporate finance, real estate, IRR/MOIC, private equity, and fixed income KEY FEATURES • Daily practice with progress tracking • Multiple estimation techniques for each problem • Detailed explanations showing various solution methods • Practice Mode for targeted skill building • Customizable settings and international number formats PREMIUM SUBSCRIPTION Premium unlocks specialty finance levels (23-30) in Daily Game and all 30 levels in Practice Mode. Privacy Policy & Terms of Use: https://fiveminutefox.com/privacy

Screenshots

66 Days4 screens
FiveMinuteFox4 screens

Verdict

The call

66 Days and FiveMinuteFox both sit at 4.8 stars, but that hides the real split: 100% of FiveMinuteFox's written reviews are positive against 50% of 66 Days's. 66 Days's advantage is update cadence (every 10 days vs every 3 months) and ratings volume (258 vs 3). On price, rating, ads and in-app purchases 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

CostPrice · In-app purchases · Ads · Monetization

Both are free to download. 66 Days sells 2 in-app purchases, starting at $15.99 per month and FiveMinuteFox sells 2 in-app purchases, starting at $4.99 per month. Whichever you choose, the download price is not the number that matters.

ReceptionRating · Positive reviews · Number of ratings

FiveMinuteFox holds the better App Store score, 5.0 against 4.8. That said, the two scores are not equally well evidenced: 66 Days has 258 ratings behind it against 3, so its average is the more settled of the two. Written reviews point the same way: 50% of 66 Days's written reviews are positive against 100% of FiveMinuteFox's.

UpkeepUpdate frequency

66 Days ships an update every 10 days, FiveMinuteFox every 3 months. The most recent releases landed on October 23, 2026 and October 22, 2026 respectively.

Scorecard3 real differences · 7 level
66 Days versus FiveMinuteFox: the parameters behind the verdict, then further details
Parameter66 DaysFiveMinuteFox
PriceFreeFree
Rating4.8 (258 ratings)5.0 (3 ratings) — better
Positive reviews50.0% of reviews100.0% of reviews — better
Number of ratings258 — better3
Update frequencyEvery 10 days — betterEvery 3 months
AdsNoNo
In-app purchasesYesYes
MonetizationFreemiumFreemium
DevicesiPhone, iPadiPhone, iPad
Requires iOS17.0 — better17.6
Further details — not scored
Size110 MB4 MB
Age rating4+4+
DeveloperUru Technologies, LLCKeepAddIt Works, LLC

Customer experience

66 Days

All ratings228 ratings
Positive96.9%
Neutral1.3%
Negative1.8%
Written reviews6 reviews
Positive50.0%
Neutral16.7%
Negative33.3%

FiveMinuteFox

All ratings3 ratings
Positive100.0%
Neutral0.0%
Negative0.0%
Written reviews2 reviews
Positive100.0%
Neutral0.0%
Negative0.0%

In-app purchases

2 purchases

66 Days

Subscriptions2
  • 66 Days Prep Pro$15.991 Month
  • 66 Days Prep Pro$49.991 Year
2 purchases

FiveMinuteFox

Subscriptions2
  • FiveMinuteFox Premium1 Month trial$4.991 Month
  • FiveMinuteFox Premium14 Days trial$29.991 Year

Questions

Is 66 Days free?
66 Days is free to download, with in-app purchases available.
Is FiveMinuteFox free?
FiveMinuteFox is free to download, with in-app purchases available.
Which has better reviews, 66 Days or FiveMinuteFox?
FiveMinuteFox is rated higher. 66 Days averages 4.8 out of 5 from 258 ratings, while FiveMinuteFox averages 5.0 from 3 ratings.
Do 66 Days or FiveMinuteFox have ads?
Neither 66 Days nor FiveMinuteFox shows ads.
Which is updated more often, 66 Days or FiveMinuteFox?
66 Days ships an update every 10 days, and FiveMinuteFox every 3 months. Most recently, 66 Days was updated on October 23, 2026 and FiveMinuteFox on October 22, 2026.

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