QUANT INTERVIEW PREP · iOS
TRAIN FOR THE
QUANT OA
Mental math. Probability. Logic. Sequences. Memory. Reaction. 13 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
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LIVES
♥♥♥
SELECT GAME
▶ PICK ONE TO START ◀
3 lives. Combos multiply your score.
3 OF 13 GAMES · THE APP HAS THE REST
GET APP →↑ THREE REAL DRILLS · PLAY THEM RIGHT HERE
FREE TO START · WORKS OFFLINE · NO ACCOUNT REQUIRED
— TRUSTED BY STUDENTS AT 80+ UNIVERSITIES —
— 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 —
MADE FOR TEST DAY
The practice modes, tracking, and extras that come with every game.
REALISTIC TEST MODES
Full-length runs with a fixed question count and clock, like 80 questions in 8 minutes or 26 sequences in 25. Test day shouldn't be the first time you work at that pace.
TOPIC DRILLS
Short sets on a single topic, like two minutes of fractions, decimals, and percentages, so you can fix one weak spot before taking a full test.
PERSONAL BESTS
Tracked separately for every game, mode, and difficulty, so a Hard score never gets compared with an Easy one.
LEADERBOARDS
Global rankings for every game, plus friend codes so you can compare scores with people you know.
WORKS OFFLINE
Every game runs without a connection. With an account, your results sync once you're back online.
DAILY BRIEF
Quant finance news and career tips, updated every day and included on every plan.
— TRAINING GAMES —
13 GAMES. 6 MODULES.
Every game in the app, grouped the way the app groups them.
MENTAL MATH
Timed arithmetic, from quick drills to full tests.
- Math Trainer
- Alpha Test
- Beta Test
- Gamma Test
SEQUENCES
Find the next number in the pattern.
- Alpha
- Beta
- Gamma
- Mixed
PROBABILITY & STATS
462 questions, each with a worked answer.
- Probability & Statistics
BRAIN TEASERS
Logic puzzles with hints and full solutions.
- Brain Teasers
REACTION
Five rounds, timed to the millisecond.
- Reaction Time
MEMORY
Recall number strings and match picture pairs.
- Number Memory
- Picture Memory
— HOW IT WAS BUILT —
DESIGNED FROM THE INSIDE
Built from real online assessments and conversations with quant traders, to help more people get into quant.
- 01
TOOK THE TESTS
Variance started with our own quant online assessments: the kinds of questions they ask, the time limits, and the pace you have to keep.
- 02
TALKED TO TRADERS
Then came a lot of conversations with quant traders about the assessments they took and the skills those tests check for.
- 03
BUILT THE APP
The games cover what showed up on those tests and what traders said to practice, set up the way the tests are set up.
— 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 13 training games, with a recommended session that follows your results.
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.
— 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 13 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 45 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