# 真好算 vs AR Protractor

The clearest difference is iOS requirement: 真好算 at 17.0 against AR Protractor's 26.0. On price, update cadence, ads and in-app purchases there is nothing between them.

Both are free to download. 真好算 sells 1 one-off in-app purchase and AR Protractor sells 1 one-off in-app purchase. Whichever you choose, the download price is not the number that matters.

真好算 ships an update monthly, AR Protractor every 3 weeks. The most recent releases landed on September 29, 2026 and September 15, 2026 respectively.

## The numbers

| Metric | 真好算 | AR Protractor |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (3 ratings)](https://appshunter.io/ios/app/id6449284621/reviews)** | — |
| Number of ratings | **3** | — |
| Positive reviews | 66.7% of reviews | — |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | Monthly | **Every 3 weeks** |
| Monetization | Free | — |
| Size | 4 MB | 2 MB |
| Requires iOS | **17.0** | 26.0 |
| Devices | **iPhone, iPad** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [滚宁 林](https://appshunter.io/developer/1688525702) | [晓强 江](https://appshunter.io/developer/6775869180) |

## What reviewers say

### 真好算

[App page](https://appshunter.io/ios/app/id6449284621)

A user-friendly calculator app designed for everyday use, featuring a clean interface and one-handed operation. It offers quick access to history, unit conversions, currency exchange, and more, all without ads.

**Highlights:** One-handed operation, Recent calculation history display, Unit conversion tools, Currency exchange rates, Amount to Chinese characters, BMI calculator, Ad-free experience

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| 真好算 PRO | $5.99 | one-time |


### AR Protractor

[App page](https://appshunter.io/ios/app/ar-protractor/id6788215923)

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Unlock all features | $4.99 | one-time |


## Frequently asked questions

### Is 真好算 free?

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

### Is AR Protractor free?

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

### Do 真好算 or AR Protractor have ads?

Neither 真好算 nor AR Protractor shows ads.

### Which is updated more often, 真好算 or AR Protractor?

真好算 ships an update monthly, and AR Protractor every 3 weeks. Most recently, 真好算 was updated on September 29, 2026 and AR Protractor on September 15, 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.*