# qMentor — Practice q, kdb+ & qSQL

> Practice q, kdb+ & qSQL (iPhone/iPad app by David Rutledge.)

- Source: https://appshunter.io/ios/app/qmentor/id6800041961 (this page in markdown: same URL + `.md`)
- Developer: [David Rutledge](https://appshunter.io/developer/6792497080)
- Category: Education, Developer Tools
- Price: Free
- Age rating: 4+
- Requires: iOS 17.0 · 1 MB
- Languages: American English
- Released: 2026-08-25
- Data updated: 2026-09-14

## What is qMentor?

qMentor is the fast way to get fluent in q and kdb+ — the array language behind the world's highest-performance time-series databases, used across quant finance and beyond.

Instead of passively reading docs, you practice. Every question shows a real snippet of q, asks you to predict the output, then explains exactly why — so right-to-left evaluation, the overloaded glyphs, and the qSQL quirks finally click.

WHAT'S INSIDE
• 800 hand-written questions across 16 units and 52 lessons
• Fundamentals first — atoms, lists, dictionaries, tables
• Then qSQL, functional queries, iterators, and amend/apply
• Real-world depth: market-data idioms (VWAP, OHLC, asof joins), tick architecture (TP/RDB/HDB), performance tuning, the .z and .Q namespaces, overloaded operators, and system commands
• A dedicated Interview Prep unit for kdb+/q job questions
• PyKX and the wider KX ecosystem

HOW IT WORKS
• Each session draws 5 questions at random from a large bank, so replaying a lesson gives fresh questions every time
• Read the code, choose the output, learn from the explanation
• Earn XP and build a daily streak to keep the habit going
• Every lesson is unlocked — jump straight to what you want to drill

BUILT FOR FOCUS
• Clean, dark, terminal-style interface
• Works fully offline
• No account, no ads, no tracking — your progress stays on your device

Whether you're prepping for a kdb+ interview, ramping up at a new desk, or just curious about the language that makes q developers so productive, qMentor turns spare minutes into real fluency.

qMentor is an independent educational app and is not affiliated with, endorsed by, or sponsored by KX Systems, Inc. "kdb+", "q", and "KX" are trademarks of their respective owners.

## Is qMentor safe?

Not enough ratings yet to assess qMentor.

## Is qMentor legit?

qMentor has limited verification signals. The AppsHunter Legitimacy Score for qMentor is 50 out of 100 points across 7 verification signals from App Store and developer data.


## Version history (last 1 release)

### 1.0 — 2026-08-25

No release notes.

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*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-09-14.*