QUANT INTERVIEW PREP · iOS
TRAIN FOR THE
QUANT OA
Mental math. Probability. Logic. Sequences. Patterns. Reaction. 11 training games covering what quant trading firms test in interviews and online assessments (the OA) — built as short, responsive drills under real time pressure.
SCORE
000000
HI-SCORE
000000
LIVES
♥♥♥
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
— INSIDE VARIANCE —
SEE THE TRAINING SYSTEM
From the first timed set to the performance review, every screen is built around deliberate practice.
TIMED PRACTICE
WORK THE PROBLEM, NOT THE INTERFACE
Focused sessions keep the question, timer, score, and input in view. Nothing competes with the next answer.
— MARKET SNAPSHOT —
THE CLOCK IS ALREADY RUNNING
The potential payout is enormous. So is the field trying to get through the first screen.
$0.0K
HIGHEST REPORTED PACKAGE
A top-end quantitative-developer package reported on Levels.fyi. In this market, the high score is worth chasing.
0+
EST. APPLICATIONS / YEAR
250,000+ shots at the same seats every year. While you wait, the queue gets longer.
$499
COST TO START
Skip the prep paywall. Load up Variance and start training as a guest for $0.
ESTIMATE MODE // CALIBRATED FROM PUBLISHED PROGRAM VOLUMES ACROSS MAJOR FIRMS
— FEATURES —
11 GAMES. 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
462 questions on dice, cards, and expected value — classic quant interview territory.
LOGIC
300+ brain teasers and deduction puzzles that show up in first-round screens.
SEQUENCES
326 arithmetic, Fibonacci-style, and recursive sequences — the staple OA question type.
PATTERNS
Number, matrix, and visual patterns firms use to test raw reasoning.
REACTION
Three modes of pure response speed — some assessments measure it directly.
— TRAINING GAMES —
EXPLORE THE TRAINING MODES
Four of the 11 training 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, ?
326 questions across arithmetic, geometric, and recursive sequences — the classic OA type.
REACTION
TAP WHEN GREEN
Three modes — Classic, Left/Right, and Multi-Target. Millisecond timing, tracked over time.
LOGIC
P(A|B) = ?
462 probability and expected-value questions, plus 300+ 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 11 training games, 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
— COMMUNITY —
TRAIN WITH OTHER PEOPLE
Variance is built for candidates, clubs, and students who want quant preparation to feel less isolated.
QUANT CLUBS
Run a club leaderboard, host an OA practice night, or ask about sponsored access for your members.
▶ EXPLORE CLUB ACCESSCAMPUS REPRESENTATIVES
Bring Variance to your university, organize friendly competitions, and help shape what we build next.
▶ GET INVOLVEDCONTRIBUTORS
Have an original practice question, mental-math shortcut, or guide idea? Send it to the team for review.
▶ SUBMIT AN IDEAPRODUCT FEEDBACK
Tell us where a drill feels wrong, which assessment you are preparing for, or what the app should add next.
▶ SEND A SIGNALPlease send only original material. Never share confidential or copied assessment questions.
— 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. Across 11 training games it drills 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 — guests get 10 games. A free account adds cloud sync, leaderboards, and 30 games a day. A Total Access subscription removes the daily cap and unlocks every mode, all 300+ brain teasers, and the jobs board.
? 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.
READY TO TRAIN?
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