# Riichi Sensei vs Quarry

The clearest difference is in-app purchases: Riichi Sensei at none against Quarry's 3. Riichi Sensei also leads on update cadence (every 4 days vs every 2 months) and iOS requirement (15.0 vs 18.0). On price, ads and device support there is nothing between them.

Both are free to download. Quarry sells 3 in-app purchases, starting at $2.99 per month. Riichi Sensei asks for nothing beyond the download.

Riichi Sensei ships an update every 4 days, Quarry every 2 months. The most recent releases landed on November 12, 2026 and November 13, 2026 respectively.

## The numbers

| Metric | Riichi Sensei | Quarry |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[5.0 (1 ratings)](https://appshunter.io/ios/app/quarry-sql-and-data-interview/id6785931623/reviews)** |
| Number of ratings | — | **1** |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | **Every 4 days** | Every 2 months |
| Monetization | — | Free |
| Size | 27 MB | 129 MB |
| Requires iOS | **15.0** | 18.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Nettlepie Kft.](https://appshunter.io/developer/1822494667) | [Mayank Gulaty](https://appshunter.io/developer/1850701548) |

## What reviewers say

### Riichi Sensei

[App page](https://appshunter.io/ios/app/riichi-sensei/id6747702966)

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases:** none


### Quarry

[App page](https://appshunter.io/ios/app/quarry-sql-and-data-interview/id6785931623)

Practice data engineering interviews offline with real SQL and Python coding challenges. Get instant feedback on your solutions and learn from detailed explanations. Designed for mobile devices, it offers a private and focused learning environment.

**Highlights:** Offline SQL and Python practice, Instant grading and feedback, Company-style interview problems, 168 problems across SQL, pandas, and Python, Free-form coding playground, Hints and full solutions

**Features:** macOS Compatibility, Vision Pro support, iPhone Duo support

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Monthly | $2.99 | per month |
| Yearly | $19.99 | per year |
| Lifetime | $29.99 | one-time |


## Frequently asked questions

### Is Riichi Sensei free?

Riichi Sensei is free to download, with no in-app purchases.

### Is Quarry free?

Quarry is free to download, with in-app purchases available.

### Do Riichi Sensei or Quarry have ads?

Neither Riichi Sensei nor Quarry shows ads.

### Which is updated more often, Riichi Sensei or Quarry?

Riichi Sensei ships an update every 4 days, and Quarry every 2 months. Most recently, Riichi Sensei was updated on November 12, 2026 and Quarry on November 13, 2026.

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*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*