# 大和リース　KnowHowBook　Vol.01 vs eYACHO Viewer 6

The clearest difference is update cadence: eYACHO Viewer 6 at monthly against 大和リース　KnowHowBook　Vol.01's every 6 months. eYACHO Viewer 6 also leads on device support (3 vs 1). On price, ads, in-app purchases and iOS requirement there is nothing between them.

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

大和リース　KnowHowBook　Vol.01 ships an update every 6 months, eYACHO Viewer 6 monthly. The most recent releases landed on September 15, 2026 and September 17, 2026 respectively.

## The numbers

| Metric | 大和リース　KnowHowBook　Vol.01 | eYACHO Viewer 6 |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 6 months | **Monthly** |
| Size | 3.5 GB | 276 MB |
| Requires iOS | **12.0** | 13.6 |
| Devices | iPad | **iPhone, iPad, iPod** |
| Age rating | 4+ | 17+ |
| Developer | [DAIWA LEASE CO., LTD.](https://appshunter.io/developer/945858494) | [MetaMoJi Corporation](https://appshunter.io/developer/449808118) |

## What reviewers say

### 大和リース　KnowHowBook　Vol.01

[App page](https://appshunter.io/ios/app/knowhowbook-vol01-39/id980491360)

**Features:** Vision Pro support

**In-app purchases:** none


### eYACHO Viewer 6

[App page](https://appshunter.io/ios/app/eyacho-viewer-6/id1574412137)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is 大和リース　KnowHowBook　Vol.01 free?

大和リース　KnowHowBook　Vol.01 is free to download, with no in-app purchases.

### Is eYACHO Viewer 6 free?

eYACHO Viewer 6 is free to download, with no in-app purchases.

### Do 大和リース　KnowHowBook　Vol.01 or eYACHO Viewer 6 have ads?

Neither 大和リース　KnowHowBook　Vol.01 nor eYACHO Viewer 6 shows ads.

### Which is updated more often, 大和リース　KnowHowBook　Vol.01 or eYACHO Viewer 6?

大和リース　KnowHowBook　Vol.01 ships an update every 6 months, and eYACHO Viewer 6 monthly. Most recently, 大和リース　KnowHowBook　Vol.01 was updated on September 15, 2026 and eYACHO Viewer 6 on September 17, 2026.

---

*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*