QUANT INTERVIEW PREP · iOS
TRAIN FOR THE
QUANT OA
Mental math. Probability. Logic. Sequences. Patterns. Reaction. The six skills quant trading firms test in interviews and online assessments (the OA) — trained like an arcade game, under real time pressure.
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LIVES
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1 OF 6 SKILLS — THE APP TRAINS ALL OF THEM
GET APP →↑ A REAL DRILL — TRY IT RIGHT HERE
FREE TO START · WORKS OFFLINE · NO ACCOUNT REQUIRED
— FEATURES —
SIX SKILLS. ONE SYSTEM.
What quant firms actually screen for, in one iOS app.
MENTAL MATH
Fast arithmetic under strict per-question time limits — the core of every quant OA.
PROBABILITY
Dice, cards, and expected value — classic quant interview territory.
LOGIC
Brain teasers and deduction puzzles that show up in first-round screens.
SEQUENCES
Arithmetic, Fibonacci-style, and recursive sequences — the staple OA question type.
PATTERNS
Number, matrix, and visual patterns firms use to test raw reasoning.
REACTION
Pure response speed — some assessments measure it directly.
— TRAINING GAMES —
PICK A GAME
Four of the six games, straight from the app — every one timed, adaptive, and modeled on real OA formats.
SPEED MATH
45 × 12 = ?
Rapid-fire arithmetic against the clock. Difficulty scales as you speed up.
SEQUENCES
1, 1, 2, 3, 5, 8, ?
Arithmetic, geometric, and recursive sequences — the classic OA question type.
REACTION
TAP WHEN GREEN
Pure response speed. Millisecond timing with your history tracked over time.
LOGIC
P(A|B) = ?
Probability, expected value, and brain teasers from real interview themes.
— HOW IT WORKS —
THE TRAINING LOOP
Download it, train the tested skills, then run timed practice before your assessment.
DOWNLOAD AND DIVE IN
Free on iOS, no account required. Pick a game and start training in seconds.
TRAIN THE SKILLS
Daily reps across all six skills, with difficulty that adapts as you improve.
PRACTICE UNDER PRESSURE
Timed sets, realistic test modes, and leaderboards sharpen speed and accuracy before the OA.
REVIEW AND REPEAT
Track your stats, target weak areas, and keep improving as interview dates get closer.
— TRUSTED BY STUDENTS AT —
— TESTIMONIALS —
SUCCESS STORIES
Hear from candidates who put in the reps.
“I came across some games here when I was interviewing for Morgan Stanley. Very useful for quant prep. I hope there will be more games added in the future.”
JONSN0V
APP STORE REVIEW
“The reaction time training was a game-changer. I improved my response time by 40% in just two weeks of daily practice. I didn't realize how slow I was.”
ALEJANDRO B
SANTANDER
“Best investment I made during recruiting. The adaptive difficulty kept me challenged without feeling overwhelmed.”
ARDA
EX-AMEX · POCKET FOREST
— FAQ —
QUESTIONS, ANSWERED
Quick answers about the app, quant online assessments, and how training works.
? WHAT IS VARIANCE?
Variance is an iOS app for quant interview prep. It trains the skills quantitative trading firms and hedge funds test in interviews and online assessments: mental math, probability, logic, number sequences, pattern recognition, and reaction speed — all under time pressure.
? IS VARIANCE FREE?
Yes. You can download Variance free on the App Store and start training immediately, no account required. A Total Access subscription unlocks every training module, cloud sync, and leaderboards.
? WHAT KINDS OF QUESTIONS DO QUANT ONLINE ASSESSMENTS INCLUDE?
Most quant OAs test fast arithmetic, number sequences, probability and expected value, logic puzzles, and pattern recognition, usually with strict per-question time limits. Variance mirrors these formats with timed, adaptive drills.
? WHICH ROLES IS VARIANCE USEFUL FOR?
Variance is built for candidates targeting quantitative trader, quantitative researcher, and trading analyst roles at proprietary trading firms, hedge funds, and market makers — as well as anyone who wants faster mental math.
? HOW IS VARIANCE DIFFERENT FROM QUESTION BANKS OR TEXTBOOKS?
Question banks test what you know. Variance trains how fast you can use it. Real OAs are speed games, so every drill in Variance is timed, adaptive, and repeatable — closer to athletic reps than reading practice.
? IS VARIANCE AVAILABLE ON ANDROID OR THE WEB?
Variance is currently iOS-only. You can try a live mental math drill on this site, but full training modules, progress tracking, and leaderboards live in the iOS app.
CONTINUE?
Your next online assessment won't wait. Get your reps in before the timer hits zero.
▶ DOWNLOAD FREE ON iOSFREE TO START · WORKS OFFLINE · NO ACCOUNT REQUIRED