# Wash Systems OPEn vs Adventist Inbox

The clearest difference is update cadence: Adventist Inbox at every 8 days against Wash Systems OPEn's every 28 months. Wash Systems OPEn's advantage is iOS requirement (11.0 vs 15.1). 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.

Wash Systems OPEn ships an update every 28 months, Adventist Inbox every 8 days. The most recent releases landed on October 4, 2026 and October 7, 2026 respectively.

## The numbers

| Metric | Wash Systems OPEn | Adventist Inbox |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 28 months | **Every 8 days** |
| Size | 12 MB | 43 MB |
| Requires iOS | **11.0** | 15.1 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Wash Systems LLC](https://appshunter.io/developer/1448638083) | [Adventist World Radio](https://appshunter.io/developer/881515241) |

## What reviewers say

### Wash Systems OPEn

[App page](https://appshunter.io/ios/app/wash-systems-open/id1448638084)

**Features:** macOS Compatibility

**In-app purchases:** none


### Adventist Inbox

[App page](https://appshunter.io/ios/app/adventist-inbox/id6748588021)

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

**In-app purchases:** none


## Frequently asked questions

### Is Wash Systems OPEn free?

Wash Systems OPEn is free to download, with no in-app purchases.

### Is Adventist Inbox free?

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

### Do Wash Systems OPEn or Adventist Inbox have ads?

Neither Wash Systems OPEn nor Adventist Inbox shows ads.

### Which is updated more often, Wash Systems OPEn or Adventist Inbox?

Wash Systems OPEn ships an update every 28 months, and Adventist Inbox every 8 days. Most recently, Wash Systems OPEn was updated on October 4, 2026 and Adventist Inbox on October 7, 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.*