# OneOpen vs ShiftFlow

The clearest difference is in-app purchases: ShiftFlow at none against OneOpen's 2. OneOpen's advantage is update cadence (every 3 days vs weekly). On price, ads, device support and iOS requirement there is nothing between them.

Both are free to download. OneOpen sells 2 in-app purchases, starting at $0.99 per year. ShiftFlow asks for nothing beyond the download.

OneOpen ships an update every 3 days, ShiftFlow weekly. Both last shipped on October 24, 2026.

## The numbers

| Metric | OneOpen | ShiftFlow |
| --- | --- | --- |
| Price | Free | Free |
| Positive reviews | — | 50.0% of reviews |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | **Every 3 days** | Weekly |
| Size | 73 MB | 3 MB |
| Requires iOS | 17.0 | 17.0 |
| Devices | **iPhone, iPad** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [Freedom Dimension (shenzhen) Technology Co., Ltd](https://appshunter.io/developer/6776064465) | [PengPeng Li](https://appshunter.io/developer/679477224) |

## What reviewers say

### OneOpen

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

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

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Advanced Access Annual | $0.99 | per year |
| Advanced Access Lifetime | $2.99 | one-time |


### ShiftFlow

[App page](https://appshunter.io/ios/app/shiftflow-rotation-calendar/id6818828064)

**In-app purchases:** none


## Frequently asked questions

### Is OneOpen free?

OneOpen is free to download, with in-app purchases available.

### Is ShiftFlow free?

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

### Do OneOpen or ShiftFlow have ads?

Neither OneOpen nor ShiftFlow shows ads.

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

OneOpen ships an update every 3 days, and ShiftFlow weekly. Most recently, OneOpen was updated on October 24, 2026 and ShiftFlow on October 24, 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.*