Comparison

66 Days vs Trading Interview Math Trainer

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

Trading Interview Math Trainer

Features
Read full description

Prepare for trading interviews at top trading firms with the Trading Interview Math Trainer - the most dedicated mental arithmetic practice app. FIVE GAME MODES • Integers - Build your foundation with whole number calculations • Decimals - Master decimal arithmetic with all operators • Fractions - Practice fraction operations • Full - Challenge yourself with mixed arithmetic problems • Custom - Tailor difficulty to your exact needs TWO QUESTION FORMATS • Open Response - Type your answers in an open answer field • Multiple Choice - Choose from four options COMPREHENSIVE ANALYTICS • Track accuracy and speed trends over time • Identify weak areas with detailed weakness reports • View timing heatmaps to find your peak performance hours • Monitor operation-specific statistics (addition, subtraction, multiplication, division) GAMIFICATION & MOTIVATION • Earn XP and level up as you practice • Build daily streaks with streak freeze protection • Unlock achievements for reaching milestones • Compete on weekly and all-time leaderboards • Track personal bests for every mode and duration CLOUD SYNC & ACCOUNTS • Sign in with Google or Apple for seamless sync • Access your progress across all your devices • Never lose your statistics or achievements DESIGNED FOR TRADERS This app is part of the Trading Interview platform (tradinginterview.com) - built specifically for aspiring traders and finance professionals. The question difficulty and formats mirror what you can encounter in real trading firm interviews. Whether you’re preparing for your first trading interview or maintaining your mental math skills, this app provides the focused practice you need to succeed. Download now and start training!

Screenshots

66 Days4 screens
Trading Interview Math Trainer4 screens

Verdict

The call

The clearest difference is in-app purchases: Trading Interview Math Trainer at none against 66 Days's 2. Trading Interview Math Trainer also leads on iOS requirement (15.1 vs 17.0). 66 Days's advantage is update cadence (every 10 days vs every 5 months). On price, ads and device support 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. Trading Interview Math Trainer asks for nothing beyond the download.

UpkeepUpdate frequency

66 Days ships an update every 10 days, Trading Interview Math Trainer every 5 months. The most recent releases landed on October 7, 2026 and September 18, 2026 respectively.

Scorecard3 real differences · 7 level
66 Days versus Trading Interview Math Trainer: the parameters behind the verdict, then further details
Parameter66 DaysTrading Interview Math Trainer
PriceFreeFree
Rating4.9 (228 ratings) — better—
Positive reviews50.0% of reviews—
Number of ratings228 — better—
Update frequencyEvery 10 days — betterEvery 5 months
AdsNoNo
In-app purchasesYesNo — better
MonetizationFreemium—
DevicesiPhone, iPadiPhone, iPad, iPod — better
Requires iOS17.015.1 — better
Further details — not scored
Size110 MB33 MB
Age rating4+4+
DeveloperUru Technologies, LLCTrading Interview B.V.

In-app purchases

2 purchases

66 Days

Subscriptions2
  • 66 Days Prep Pro$15.991 Month
  • 66 Days Prep Pro$49.991 Year
None

Trading Interview Math Trainer

No in-app purchases

Questions

Is 66 Days free?
66 Days is free to download, with in-app purchases available.
Is Trading Interview Math Trainer free?
Trading Interview Math Trainer is free to download, with no in-app purchases.
Do 66 Days or Trading Interview Math Trainer have ads?
Neither 66 Days nor Trading Interview Math Trainer shows ads.
Which is updated more often, 66 Days or Trading Interview Math Trainer?
66 Days ships an update every 10 days, and Trading Interview Math Trainer every 5 months. Most recently, 66 Days was updated on October 7, 2026 and Trading Interview Math Trainer on September 18, 2026.

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