# 城市謎案 Case City vs PairIndex

The clearest difference is ads: 城市謎案 Case City at none against PairIndex's shown. 城市謎案 Case City also leads on iOS requirement (13.0 vs 15.0). PairIndex's advantage is update cadence (every 4 days vs every 3 months). On price, in-app purchases and device support there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

城市謎案 Case City ships an update every 3 months, PairIndex every 4 days. The most recent releases landed on November 6, 2026 and November 10, 2026 respectively.

## The numbers

| Metric | 城市謎案 Case City | PairIndex |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | **No** | Yes |
| Update frequency | Every 3 months | **Every 4 days** |
| Size | 27 MB | 24 MB |
| Requires iOS | **13.0** | 15.0 |
| Devices | iPhone, iPod | iPhone, iPod |
| Age rating | 12+ | 4+ |
| Developer | [JingZhi Co., Ltd.](https://appshunter.io/developer/981874522) | [Hiroomi Kubo](https://appshunter.io/developer/1819954362) |

## What reviewers say

### 城市謎案 Case City

[App page](https://appshunter.io/ios/app/case-city/id1466057703)

**In-app purchases:** none


### PairIndex

[App page](https://appshunter.io/ios/app/pairindex/id6811271011)

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

**In-app purchases:** none


## Frequently asked questions

### Is 城市謎案 Case City free?

城市謎案 Case City is free to download, with no in-app purchases.

### Is PairIndex free?

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

### Do 城市謎案 Case City or PairIndex have ads?

PairIndex shows ads; 城市謎案 Case City does not.

### Which is updated more often, 城市謎案 Case City or PairIndex?

城市謎案 Case City ships an update every 3 months, and PairIndex every 4 days. Most recently, 城市謎案 Case City was updated on November 6, 2026 and PairIndex on November 10, 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.*