# Notedown vs OneOpen

Notedown and OneOpen 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.

Notedown ships an update every 4 days, OneOpen weekly. The most recent releases landed on September 23, 2026 and September 27, 2026 respectively.

## The numbers

| Metric | Notedown | OneOpen |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 4 days** | Weekly |
| Size | 24 MB | 12 MB |
| Requires iOS | 17.0 | 17.0 |
| Devices | iPhone | **iPhone, iPad** |
| Age rating | 4+ | 4+ |
| Developer | [Yuki Okawa](https://appshunter.io/developer/1867195492) | [Freedom Dimension (shenzhen) Technology Co., Ltd](https://appshunter.io/developer/6776064465) |

## What reviewers say

### Notedown

[App page](https://appshunter.io/ios/app/notedown-markdown-notes/id6785522355)

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

**In-app purchases:** none


### OneOpen

[App page](https://appshunter.io/ios/app/oneopen-file-viewer/id6792251542)

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

**In-app purchases:** none


## Frequently asked questions

### Is Notedown free?

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

### Is OneOpen free?

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

### Do Notedown or OneOpen have ads?

Neither Notedown nor OneOpen shows ads.

### Which is updated more often, Notedown or OneOpen?

Notedown ships an update every 4 days, and OneOpen weekly. Most recently, Notedown was updated on September 23, 2026 and OneOpen on September 27, 2026.

---

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