# SQL Practice vs 黑洞加速器VPN

The clearest difference is in-app purchases: 黑洞加速器VPN at none against SQL Practice's 2. SQL Practice's advantage is review sentiment (86% vs 67%) and iOS requirement (13.0 vs 15.0). On price, update cadence, ads and chart position there is nothing between them.

Both are free to download. SQL Practice sells 2 in-app purchases, starting at $3.99 per 7 days. 黑洞加速器VPN asks for nothing beyond the download.

Both ship on a similar rhythm, roughly every 6 months. The most recent releases landed on October 15, 2026 and October 2, 2026 respectively.

## The numbers

| Metric | SQL Practice | 黑洞加速器VPN |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.7 (137 ratings)](https://appshunter.io/ios/app/sql-practice-learn-database/id6749337619/reviews)** | — |
| Number of ratings | **137** | — |
| Positive reviews | **86.1% of reviews** | 66.7% of reviews |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Every 6 months | Every 6 months |
| Monetization | **Free** | Freemium |
| Best chart rank | **#71** | #140 |
| Size | 48 MB | 21 MB |
| Requires iOS | **13.0** | 15.0 |
| Devices | iPhone, iPod | **iPhone, iPad, iPod** |
| Age rating | 4+ | 17+ |
| Developer | [Marton Greber](https://appshunter.io/developer/1748728717) | [YuTina](https://appshunter.io/developer/1843662678) |

## What reviewers say

### SQL Practice

[App page](https://appshunter.io/ios/app/sql-practice-learn-database/id6749337619)

**Currently charting:** #71 Top Grossing · Developer Tools, #124 Top Free · Developer Tools (US App Store)

Master SQL with short, daily interactive sessions. Practice real-world queries and datasets on your phone to build confidence for career changes, professional development, or technical interviews. Learn database concepts and advanced techniques at your own pace.

**Highlights:** 15-minute daily learning sessions, Interactive exercises with real-world datasets, Progressive curriculum from beginner to advanced, Instant feedback and mistake analysis, Gamified progress tracking (streaks, XP, achievements), Master SELECT, JOINs, aggregations, and subqueries

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Pro Access | $3.99 | per 7 days |
| Pro Access | $19.99 | per year |


### 黑洞加速器VPN

[App page](https://appshunter.io/ios/app/vpn/id6753352219)

**Currently charting:** #140 Top Free · Developer Tools (US App Store)

This app provides professional, stable, and fast network acceleration services. It uses intelligent route optimization for a smooth connection experience, prioritizing privacy and security. Exclusive membership benefits offer enhanced features for frequent users and business teams.

**Highlights:** High-efficiency acceleration, Intelligent node allocation, Privacy and security encryption, Multi-scenario adaptation, Dedicated line acceleration, Unlimited duration for members

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

**In-app purchases:** none


## Frequently asked questions

### Is SQL Practice free?

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

### Is 黑洞加速器VPN free?

黑洞加速器VPN is free to download, with no in-app purchases.

### Do SQL Practice or 黑洞加速器VPN have ads?

Neither SQL Practice nor 黑洞加速器VPN shows ads.

### Which is updated more often, SQL Practice or 黑洞加速器VPN?

SQL Practice ships an update every 6 months, and 黑洞加速器VPN every 6 months. Most recently, SQL Practice was updated on October 15, 2026 and 黑洞加速器VPN on October 2, 2026.

### Which is more popular, SQL Practice or 黑洞加速器VPN?

SQL Practice currently peaks at #71 in the App Store charts, and 黑洞加速器VPN at #140. Chart position reflects recent download velocity rather than total install base.

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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.*