Built for Quant OAs
Variance: The Quant Prep App is an iOS app designed to help you train for the math-heavy online assessments and technical interviews used by top quantitative trading firms.
Your Personal Quant Coach
Variance is a mobile training app that helps you build the cognitive skills tested in quant trading assessments — mental math, pattern recognition, reaction speed, sequence reasoning, and probability.
Instead of grinding practice sheets alone, Variance turns preparation into a series of focused, gamified challenges designed to build speed and accuracy under pressure.
The app also includes a daily market brief and a database of quant trading firms and roles, so you can stay informed while you train.
platform: iOS
modes: [mental_math, sequences, patterns, reaction, puzzles]
daily_brief: true
firm_database: true
leaderboards: true
difficulty: adaptive
✓ Ready to train
Quant Interviews Are Hard. Training Shouldn't Be Boring.
Online assessments at quant trading firms test speed and accuracy in ways that most candidates are completely unprepared for. The math is rarely complex — but the time pressure, the format, and the volume of questions is.
Most prep resources are static: PDFs, forum posts, YouTube videos. Variance was built to give candidates a hands-on, mobile-first training environment they can use anywhere — on the subway, between classes, or during a lunch break.
The goal is simple: show up to your assessment having already solved thousands of similar problems under real time pressure.
Built for Serious Candidates
Quant-Focused Students
Math, CS, physics, and statistics students targeting roles at top quantitative trading firms.
Career Switchers
Software engineers and analysts pivoting into quantitative finance and trading.
Active Candidates
Anyone with an upcoming online assessment or first-round interview at a quant firm.
Ready to Start Training?
Download Variance on the App Store and start preparing today.
Download on the App Store