# 试题库 vs Standard Notation Calculator

The clearest difference is update cadence: 试题库 at every 3 months against Standard Notation Calculator's every 9 months. Standard Notation Calculator's advantage is iOS requirement (10.0 vs 17). On price, ads, 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.

试题库 ships an update every 3 months, Standard Notation Calculator every 9 months. The most recent releases landed on September 13, 2026 and May 16, 2026 respectively.

## The numbers

| Metric | 试题库 | Standard Notation Calculator |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 3 months** | Every 9 months |
| Size | 18 MB | 28 MB |
| Requires iOS | 17 | **10.0** |
| Devices | iPhone | **iPhone, iPod** |
| Age rating | 17+ | 4+ |
| Developer | [中科软股教育科技(北京)股份有限公司](https://appshunter.io/developer/1395665821) | [Ahmad Sattar](https://appshunter.io/developer/1458483953) |

## What reviewers say

### 试题库

[App page](https://appshunter.io/ios/app/id1478850740)

**In-app purchases:** none


### Standard Notation Calculator

[App page](https://appshunter.io/ios/app/standard-notation-calculator/id1601032021)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is 试题库 free?

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

### Is Standard Notation Calculator free?

Standard Notation Calculator is free to download, with no in-app purchases.

### Do 试题库 or Standard Notation Calculator have ads?

Neither 试题库 nor Standard Notation Calculator shows ads.

### Which is updated more often, 试题库 or Standard Notation Calculator?

试题库 ships an update every 3 months, and Standard Notation Calculator every 9 months. Most recently, 试题库 was updated on September 13, 2026 and Standard Notation Calculator on May 16, 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.*