# memoir vs PDR測位

The clearest difference is update cadence: memoir at every 2 months against PDR測位's every 12 months. 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.

memoir ships an update every 2 months, PDR測位 every 12 months. The most recent releases landed on September 8, 2026 and September 14, 2026 respectively.

## The numbers

| Metric | memoir | PDR測位 |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 2 months** | Every 12 months |
| Size | 89 MB | 3 MB |
| Requires iOS | 16.4 | **16.0** |
| Devices | iPhone, iPod | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [YOUHEI IINO](https://appshunter.io/developer/1296534954) | [Musen Connect, Inc.](https://appshunter.io/developer/1570398182) |

## What reviewers say

### memoir

[App page](https://appshunter.io/ios/app/memoir/id1613532672)

**Features:** macOS Compatibility

**In-app purchases:** none


### PDR測位

[App page](https://appshunter.io/ios/app/pdr/id6448334677)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is memoir free?

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

### Is PDR測位 free?

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

### Do memoir or PDR測位 have ads?

Neither memoir nor PDR測位 shows ads.

### Which is updated more often, memoir or PDR測位?

memoir ships an update every 2 months, and PDR測位 every 12 months. Most recently, memoir was updated on September 8, 2026 and PDR測位 on September 14, 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.*