# 特許情報保存 vs TDMS

The clearest difference is ads: TDMS at none against 特許情報保存's shown. 特許情報保存's advantage is update cadence (every 2 months vs every 26 months) and iOS requirement (11.0 vs 15.0). On price, 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.

特許情報保存 ships an update every 2 months, TDMS every 26 months. The most recent releases landed on October 13, 2026 and October 25, 2026 respectively.

## The numbers

| Metric | 特許情報保存 | TDMS |
| --- | --- | --- |
| Price | Free | Free |
| Positive reviews | 66.7% of reviews | — |
| In-app purchases | No | No |
| Ads | Yes | **No** |
| Update frequency | **Every 2 months** | Every 26 months |
| Size | 18 MB | 4 MB |
| Requires iOS | **11.0** | 15.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 17+ | 4+ |
| Developer | [Legal Prompt Inc.](https://appshunter.io/developer/1490746932) | [TOHNICHI MFG.CO., LTD.](https://appshunter.io/developer/1609166229) |

## What reviewers say

### 特許情報保存

[App page](https://appshunter.io/ios/app/id1532651790)

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

**In-app purchases:** none


### TDMS

[App page](https://appshunter.io/ios/app/tdms/id6479276073)

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

**In-app purchases:** none


## Frequently asked questions

### Is 特許情報保存 free?

特許情報保存 is free to download, with no in-app purchases.

### Is TDMS free?

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

### Do 特許情報保存 or TDMS have ads?

特許情報保存 shows ads; TDMS does not.

### Which is updated more often, 特許情報保存 or TDMS?

特許情報保存 ships an update every 2 months, and TDMS every 26 months. Most recently, 特許情報保存 was updated on October 13, 2026 and TDMS 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.*