# ObsiKO vs PureOpen

ObsiKO and PureOpen 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.

ObsiKO ships an update every 6 days, PureOpen every 9 days. Both last shipped on October 10, 2026.

## The numbers

| Metric | ObsiKO | PureOpen |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 6 days** | Every 9 days |
| Size | 75 MB | 5 MB |
| Requires iOS | 15.1 | **15.0** |
| Devices | iPhone, iPad, iPod, Apple Watch | iPhone, iPad, iPod, Mac |
| Age rating | 4+ | 4+ |
| Developer | [Hyojin Kim](https://appshunter.io/developer/6783405453) | [Yechiel Ben David](https://appshunter.io/developer/1863307655) |

## What reviewers say

### ObsiKO

[App page](https://appshunter.io/ios/app/obsiko-ai-note-plus-mindmap/id6783405451)

**Features:** macOS Compatibility, Apple Watch app, Vision Pro support

**In-app purchases:** none


### PureOpen

[App page](https://appshunter.io/ios/app/pureopen-markdown-editor/id6800787472)

**Features:** Vision Pro support

**In-app purchases:** none


## Frequently asked questions

### Is ObsiKO free?

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

### Is PureOpen free?

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

### Do ObsiKO or PureOpen have ads?

Neither ObsiKO nor PureOpen shows ads.

### Which is updated more often, ObsiKO or PureOpen?

ObsiKO ships an update every 6 days, and PureOpen every 9 days. Most recently, ObsiKO was updated on October 10, 2026 and PureOpen on October 10, 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.*