# Personal colorimeter vs Open Docs

The clearest difference is iOS requirement: Personal colorimeter at 12.0 against Open Docs's 18.2. On price, update cadence, ads and in-app purchases there is nothing between them.

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

Personal colorimeter ships an update every 2 weeks, Open Docs fortnightly. The most recent releases landed on September 15, 2026 and September 17, 2026 respectively.

## The numbers

| Metric | Personal colorimeter | Open Docs |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 2 weeks | **Fortnightly** |
| Size | 42 MB | 36 MB |
| Requires iOS | **12.0** | 18.2 |
| Devices | iPhone, iPod | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Korea Fashion Shimri Research Institute Co., Ltd.](https://appshunter.io/developer/1793486557) | [Ho Dung](https://appshunter.io/developer/6805516667) |

## What reviewers say

### Personal colorimeter

[App page](https://appshunter.io/ios/app/personal-colorimeter/id6741187236)

**Features:** macOS Compatibility

**In-app purchases:** none


### Open Docs

[App page](https://appshunter.io/ios/app/open-docs-document-viewer/id6806442426)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Personal colorimeter free?

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

### Is Open Docs free?

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

### Do Personal colorimeter or Open Docs have ads?

Neither Personal colorimeter nor Open Docs shows ads.

### Which is updated more often, Personal colorimeter or Open Docs?

Personal colorimeter ships an update every 2 weeks, and Open Docs fortnightly. Most recently, Personal colorimeter was updated on September 15, 2026 and Open Docs on September 17, 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.*