# 量信 vs 知知丫丫

量信 and 知知丫丫 are too close to call on the numbers: across 6 compared parameters — price, update cadence, ads and in-app purchases among them — neither pulls far enough ahead to decide it. What separates them is feature set and interface, not measurable difference.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

量信 ships an update every 9 days, 知知丫丫 every 2 weeks. The most recent releases landed on October 7, 2026 and October 25, 2026 respectively.

## The numbers

| Metric | 量信 | 知知丫丫 |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 9 days** | Every 2 weeks |
| Size | 154 MB | 113 MB |
| Requires iOS | 12.0 | 12.0 |
| Devices | iPhone, iPod | **iPhone, iPad, iPod** |
| Age rating | 12+ | 4+ |
| Developer | [Nanjing e-Quantum Information Technology Co., Ltd](https://appshunter.io/developer/1602169761) | [Beijing Zhizhi Yaya Technology Co., Ltd](https://appshunter.io/developer/1725079838) |

## What reviewers say

### 量信

[App page](https://appshunter.io/ios/app/id1602169759)

**In-app purchases:** none


### 知知丫丫

[App page](https://appshunter.io/ios/app/id6475754527)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is 量信 free?

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

### Is 知知丫丫 free?

知知丫丫 is free to download, with no in-app purchases.

### Do 量信 or 知知丫丫 have ads?

Neither 量信 nor 知知丫丫 shows ads.

### Which is updated more often, 量信 or 知知丫丫?

量信 ships an update every 9 days, and 知知丫丫 every 2 weeks. Most recently, 量信 was updated on October 7, 2026 and 知知丫丫 on October 25, 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.*