If you are prepping for quant trading, research, or developer interviews, two names come up as structured question banks worth your time: QuantQuestions (quantquestions.io) and QuantVault (this site). They are the closest structural analogs to each other, so candidates reasonably ask which to use. This page answers that honestly. We built QuantVault, so treat us as the interested party we are; the comparison below sticks to what each product actually does, and we say plainly where QuantQuestions is the better fit.
The short version
QuantQuestions is a genuinely good, focused question bank. It pairs a curated set of roughly 1,200+ problems with worked solutions, organizes company-specific playlists for about 19 firms (Jane Street, Citadel, IMC, and similar), throws in a free Zetamac-style mental-math drill, and offers student discounts. The experience is clean and deliberately narrow. If what you want is a tight, well-edited set of problems with firm playlists, you will be well served, and it is popular for good reason in US, UK, and Australian university circles.
QuantVault is the wider, deeper option, and the newer one. It carries 2,800+ problems with full written solutions, intuition, and hints (396 free, no signup), maps each firm's process stage by stage with real online-assessment tests rather than a single tag, auto-grades coding problems in the browser, and adds 40+ interactive courses and market-making games. The trade-off is honest: our community is still growing, while QuantQuestions has a longer track record.
Feature comparison
| QuantVault | QuantQuestions | |
|---|---|---|
| Problem count | 2,800+ problems | ~1,200+ problems |
| Free problems | 396 free, no signup required | A free tier plus student discounts |
| Full solutions + intuition | Yes — full written solution, intuition, and hints on every problem | Yes — worked solutions |
| Firm playlists | Yes — firm-tagged problem sets | Yes — company playlists for ~19 firms |
| Firm interview funnels (stage-by-stage + OA tests) | Yes — each firm's process mapped stage by stage with real OA tests | Not a stated feature |
| Coding auto-judge | Yes — Python in-browser, LeetCode-style grading | Not a stated feature |
| Interactive courses | Yes — 40+ courses | Not a stated feature |
| Mental-math drill | Market-making trading games (different format) | Yes — free Zetamac-style drill |
Where QuantQuestions wins
A curated bank has real advantages, and this is the honest part. A tighter set is less intimidating to start and easier to finish; you are less likely to feel lost in a sea of thousands of problems. QuantQuestions' editing is consistent, its firm playlists are clean, and its free mental-math drill is a legitimately useful tool that many candidates use daily regardless of which bank they pay for. The student discount matters if you are on a university budget. If your goal is simply "give me a well-chosen list of problems and good solutions for the firms I am targeting," QuantQuestions does exactly that without extra surface area to learn.
Where QuantVault differentiates
The differences are about scale and depth, not about one bank being "correct." Four things set QuantVault apart for candidates who want more than a problem list.
- Scale with full solutions. 2,800+ problems is more than twice a ~1,200 set, and every one ships a full written solution plus the intuition behind it and staged hints — so you can get unstuck without reading the full answer. Start with the problem bank (396 are free, no signup).
- Firm interview funnels, not just tags. A company playlist tells you which problems are associated with a firm. A funnel maps the process: which stage comes first, what the online assessment looks like, and what each round tests — with real, playable OA tests attached, not a label. See the funnels for Jane Street and Citadel, or browse all of them on the firms page.
- An auto-graded coding judge. Coding problems run Python in your browser, LeetCode-style: write a solution, hit run, get graded against real test cases. That is a fundamentally different practice loop than reading a written answer to a coding question.
- Courses and games. Beyond the bank, there are 40+ interactive courses and market-making trading games for the parts of the interview a static problem set cannot rehearse, plus an adaptive readiness score that tracks where you actually stand.
Which should you pick?
Pick by use case, not by brand.
- Choose QuantQuestions if you want a clean, curated, finishable set with firm playlists and a free mental-math drill, and you value a longer track record and a deliberately narrow experience.
- Choose QuantVault if you want maximum coverage with full solutions and intuition, stage-by-stage firm funnels with real OA tests, an auto-graded coding judge, and courses and games — and you are comfortable with a younger, still-growing community.
They are not mutually exclusive. Plenty of candidates drill mental math on one tool, work a curated firm playlist on another, and use QuantVault's larger bank, funnels, and coding judge for depth and firm-specific rounds. The best prep usually combines a tight core with a deep well to draw from. You can try QuantVault's free problems right now without an account and decide for yourself.
Frequently asked questions
Is QuantVault a good QuantQuestions alternative?
Yes, and it is the closest structural alternative. Both are quant-interview question banks with worked solutions and firm playlists. QuantVault is larger (2,800+ problems vs roughly 1,200+) and adds firm interview funnels with real online-assessment tests, an auto-graded in-browser coding judge, and 40+ interactive courses. QuantQuestions is the more established, deliberately narrow option with a free Zetamac-style mental-math drill. If you want a curated, finishable set, QuantQuestions is a strong choice; if you want scale and depth, QuantVault is the better fit. You can try 396 QuantVault problems free with no signup.
How is QuantQuestions.io? Is it worth it?
QuantQuestions is a well-regarded, focused question bank with about 1,200+ curated problems, worked solutions, company playlists for roughly 19 firms, a free mental-math drill, and student discounts. It is popular in US, UK, and Australian university circles for good reason: the editing is consistent and the experience is clean. If your goal is a tight, well-chosen problem set for the firms you are targeting, it is a solid pick. Candidates wanting a larger bank, stage-by-stage firm funnels, or an auto-graded coding judge tend to also use QuantVault.
What does QuantVault have that QuantQuestions does not?
Four main things. First, scale: 2,800+ problems vs roughly 1,200+, each with a full written solution, intuition, and hints. Second, firm interview funnels that map each firm's process stage by stage with real OA tests rather than a single company tag. Third, an auto-graded coding judge that runs Python in your browser, LeetCode-style. Fourth, 40+ interactive courses, market-making games, and an adaptive readiness score. The honest trade-off is that QuantVault is newer and its community is still growing.
Which is the best quant interview question bank?
There is no single best one; it depends on what you want. For a clean, curated, finishable set with firm playlists and a free mental-math drill, QuantQuestions is excellent. For the widest coverage with full solutions and intuition, stage-by-stage firm funnels with real OA tests, and an auto-graded coding judge, QuantVault goes deeper. Many candidates use both. Start with QuantVault's free problems and firm guides to see whether the extra depth matches how you prefer to study.
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.