# 观测云 vs Convert IT

The clearest difference is in-app purchases: 观测云 at none against Convert IT's 2. 观测云 also leads on ads (none vs shown). Convert IT's advantage is update cadence (every 4 days vs every 6 weeks) and iOS requirement (15.1 vs 17.0). On price and device support there is nothing between them.

Both are free to download. Convert IT sells 2 in-app purchases, starting at $0.99 per 7 days. 观测云 asks for nothing beyond the download.

观测云 ships an update every 6 weeks, Convert IT every 4 days. The most recent releases landed on October 26, 2026 and November 5, 2026 respectively.

## The numbers

| Metric | 观测云 | Convert IT |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[5.0 (2 ratings)](https://appshunter.io/ios/app/convert-it-all-units/id6759112357/reviews)** |
| Number of ratings | — | **2** |
| Positive reviews | — | 100.0% of reviews |
| In-app purchases | **No** | Yes |
| Ads | **No** | Yes |
| Update frequency | Every 6 weeks | **Every 4 days** |
| Monetization | — | Free with in-app purchases |
| Size | 27 MB | 55 MB |
| Requires iOS | 17.0 | **15.1** |
| Devices | iPhone, iPad | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [常州观测云信息科技有限公司](https://appshunter.io/developer/6796597087) | [Jenesh Napit](https://appshunter.io/developer/1742677233) |

## What reviewers say

### 观测云

[App page](https://appshunter.io/ios/app/id1494097190)

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

**In-app purchases:** none


### Convert IT

[App page](https://appshunter.io/ios/app/convert-it-all-units/id6759112357)

Instantly convert measurements across over 40 categories, from everyday needs to science and finance. Features include pet age, currency exchange rates, clothing sizes, and digital tools. No account is required; simply open and convert.

**Highlights:** 40+ conversion categories, Pet age calculator, Live currency exchange rates, Clothing size conversions, Digital tools (data storage, color codes), Smart calculators (tip, discount, BMI), Real-time conversion

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Pro Weekly | $0.99 | per 7 days |
| Pro Yearly | $9.99 | per year |


## Frequently asked questions

### Is 观测云 free?

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

### Is Convert IT free?

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

### Do 观测云 or Convert IT have ads?

Convert IT shows ads; 观测云 does not.

### Which is updated more often, 观测云 or Convert IT?

观测云 ships an update every 6 weeks, and Convert IT every 4 days. Most recently, 观测云 was updated on October 26, 2026 and Convert IT on November 5, 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.*