# 地震预警 vs Ruler

The clearest difference is iOS requirement: 地震预警 at 13.0 against Ruler's 16.0. On price and in-app purchases there is nothing between them.

Both are free to download. 地震预警 sells 3 in-app purchases, starting at $9.99 per month and Ruler sells 7 in-app purchases, starting at $2.99 per 7 days. Whichever you choose, the download price is not the number that matters.

## The numbers

| Metric | 地震预警 | Ruler |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[5.0 (5 ratings)](https://appshunter.io/ios/app/ruler-measuring-tape/id6754293314/reviews)** |
| Number of ratings | — | **5** |
| In-app purchases | Yes | Yes |
| Ads | — | No |
| Update frequency | — | Every 2 days |
| Monetization | — | Subscription |
| Size | 70 MB | 27 MB |
| Requires iOS | **13.0** | 16.0 |
| Devices | — | **iPhone** |
| Age rating | 4+ | 4+ |
| Developer | [树轩 魏](https://appshunter.io/developer/1728876217) | [Myroslav Drozd](https://appshunter.io/developer/1847677489) |

## What reviewers say

### 地震预警

[App page](https://appshunter.io/ios/app/and/id6479295528)

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| VIP包月 | $9.99 | per month |
| VIP包季 | $29.99 | per 3 months |
| VIP包年 | $39.99 | per year |


### Ruler

[App page](https://appshunter.io/ios/app/ruler-measuring-tape/id6754293314)

Transform your phone into a precise measuring tool. Accurately measure objects, surfaces, and distances using your screen or camera. Ideal for home, work, or on-the-go tasks, providing quick and reliable measurements.

**Highlights:** Measure objects on screen, Switch between units (cm, mm, inches), Save and share measurements, Easy-to-use interface, Accurate and fast measurements

**Features:** macOS Compatibility

**In-app purchases (7)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Smart Ruler | $2.99 | per 7 days |
| Smart Ruler | $4.99 | per 7 days |
| Smart Ruler | $6.99 | per 7 days |
| Smart Ruler | $9.99 | per year |
| Smart Ruler | $14.99 | per year |
| Smart Ruler | $19.99 | per year |
| Smart Ruler | $24.99 | per year |


## Frequently asked questions

### Is 地震预警 free?

地震预警 is free to download, with in-app purchases available.

### Is Ruler free?

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

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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.*