QuantGuide is probably the best-known name in interactive quant interview practice — a large, LeetCode-style bank of quant problems with difficulty tiers and a daily question. QuantVault covers a lot of the same ground but is organized around a different unit: not the individual problem, but the interview process — which firm, which stage, what that stage actually tests. This comparison is honest about where each is stronger; it is written by the QuantVault team, so discount accordingly, but the factual differences below are easy to verify yourself since both platforms have free tiers.
What QuantGuide is best at
- A big, clean, LeetCode-style bank. If you know exactly what topic you want to grind, its browse-by-topic-and-difficulty experience is polished and fast.
- The daily-question habit loop. A well-executed streak mechanic that keeps you touching problems every day with minimal friction.
- Community familiarity. It is widely used, so problem discussions and study-group references to it are common.
What QuantVault is best at
- Firm-by-firm interview funnels. 55+ firms broken into their real stages — the OA, each round, what each one screens for — so you prepare for Citadel's process or Optiver's process, not "quant interviews" in the abstract.
- Online-assessment practice. Timed, realistic OA simulations modeled on specific firms' actual assessments (Optiver's 80-in-8, SIG, IMC and others) — the stage that eliminates most candidates and that generic question banks skip entirely.
- Trading and market-making games. Interactive games built on the market-making rounds trading firms actually run — practice you cannot get from a static problem list.
- Depth per problem. Every problem carries a full worked solution, hints, and intuition sections, plus an adaptive daily warmup that tracks your weak topics via an Elo rating and feeds you the next problem worth doing.
- A genuinely large free tier. About 400 problems free with complete solutions — no card required — next to free lessons, games, and firm OA samples.
Side-by-side comparison
| Dimension | QuantVault | QuantGuide |
|---|---|---|
| Problem bank | 2,800+ problems, full solutions + hints + intuition on each | Large bank, LeetCode-style browsing by topic/difficulty |
| Organizing principle | Firm funnels: prep by company and stage | Topic and difficulty: prep by problem type |
| Firm-specific prep | 55+ firm funnels, stage by stage | Company tags on problems |
| OA simulation | Timed, firm-modeled OA practice tests | Not a focus |
| Trading games | Market-making and trading games built in | Not a focus |
| Adaptivity | Elo-rated daily warmup targets weak topics | Daily question, streak-based |
| Free tier | ~400 problems with full solutions, free games and lessons | Sizable free bank; deeper features paid |
Which one should you use?
Honest answer: it depends on how you prep. If your style is topic-first grinding — "give me two hundred probability problems in rising difficulty" — QuantGuide's browsing experience serves that beautifully. If your prep is target-first — "I have a Citadel OA in three weeks and an Optiver final round after" — QuantVault is built around exactly that question, from the firm's OA format to what each onsite round tests, with the games and timed assessments to match.
Plenty of candidates use both: one for volume drilling, one for firm-targeted preparation. Since both have real free tiers, the cheapest correct move is to try each against the firms you are actually targeting and see which surfaces the material you need.
Start practicing on QuantVault
The free problem set (~400 problems, full solutions), the firm funnels, and several trading games are free without a card. If you are mid-pipeline at a specific firm, start from its funnel page and work backward from the stage in front of you.
Frequently asked questions
Is QuantVault or QuantGuide better for quant interview prep?
They optimize for different things. QuantGuide is a polished LeetCode-style bank organized by topic and difficulty; QuantVault organizes prep around specific firms' interview processes — funnels for 55+ firms, timed OA simulations, and trading games — with full worked solutions on every problem. Topic-grinders lean QuantGuide; firm-targeted candidates lean QuantVault; many use both.
What is the main difference between QuantGuide and QuantVault?
The organizing unit. QuantGuide is problem-first (browse by topic/difficulty, daily question). QuantVault is process-first: pick your target firm, see its real stages — OA, rounds, final — and practice each stage's actual format, including timed OA simulations and market-making games.
Does QuantVault have a free tier like QuantGuide?
Yes — about 400 problems with complete step-by-step solutions, plus free lessons, trading games, and sample firm OAs, no card required.
Can I use QuantGuide and QuantVault together?
Yes, and it is a sensible split: volume drilling by topic on one, firm-specific funnels, OA simulations, and games on the other. Both free tiers are large enough to evaluate against your target firms before paying for anything.
Practice the real thing
QuantVault has 2,800+ quant interview problems with full solutions, intuition, and hints, firm-by-firm interview funnels, and an auto-graded coding judge. Start free.