# 钥匙尺子 vs PartSets

The clearest difference is in-app purchases: 钥匙尺子 at none against PartSets's 5. 钥匙尺子 also leads on update cadence (fortnightly vs every 5 months) and iOS requirement (10.0 vs 17.0). On price, ads and device support there is nothing between them.

Both are free to download. PartSets sells 5 one-off in-app purchases. 钥匙尺子 asks for nothing beyond the download.

钥匙尺子 ships an update fortnightly, PartSets every 5 months. The most recent releases landed on October 18, 2026 and October 20, 2026 respectively.

## The numbers

| Metric | 钥匙尺子 | PartSets |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[2.0 (1 ratings)](https://appshunter.io/ios/app/partsets/id6612022770/reviews)** |
| Number of ratings | — | **1** |
| Positive reviews | — | 0.0% of reviews |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | **Fortnightly** | Every 5 months |
| Monetization | — | Free with in-app purchases |
| Size | 31 MB | 9 MB |
| Requires iOS | **10.0** | 17.0 |
| Devices | iPhone, iPod | **iPhone, iPad, Mac** |
| Age rating | 4+ | 4+ |
| Developer | [Wuxi Kaiyang Electronic Technology Co., Ltd.](https://appshunter.io/developer/1131154502) | [宗林 郭](https://appshunter.io/developer/1752221005) |

## What reviewers say

### 钥匙尺子

[App page](https://appshunter.io/ios/app/id1479796469)

**Features:** macOS Compatibility

**In-app purchases:** none


### PartSets

[App page](https://appshunter.io/ios/app/partsets/id6612022770)

Easily manage your parts or items with this app. Add unlimited items, categorize them, track quantities, and even store associated PDF files. Enjoy secure data management with iCloud synchronization across multiple Apple devices.

**Highlights:** Unlimited parts management, Categorization and quantity tracking, iCloud synchronization, Multi-device operation, PDF resource saving, Secure data storage

**In-app purchases (5)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Advanced Features(Trial 1week) | Free | one-time |
| Advanced Features(A week) | $0.29 | one-time |
| Advanced Features(A Month) | $0.49 | one-time |
| Advanced Features(A year) | $4.99 | one-time |
| Advanced Feature(Forever) | $11.49 | one-time |


## Frequently asked questions

### Is 钥匙尺子 free?

钥匙尺子 is free to download, with no in-app purchases.

### Is PartSets free?

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

### Do 钥匙尺子 or PartSets have ads?

Neither 钥匙尺子 nor PartSets shows ads.

### Which is updated more often, 钥匙尺子 or PartSets?

钥匙尺子 ships an update fortnightly, and PartSets every 5 months. Most recently, 钥匙尺子 was updated on October 18, 2026 and PartSets on October 20, 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.*