# OpenDocument Reader vs Due.Zero

The clearest difference is ads: Due.Zero at none against OpenDocument Reader's shown. OpenDocument Reader's advantage is update cadence (every 4 weeks vs every 10 months) and iOS requirement (15.0 vs 17.6). On price, 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.

OpenDocument Reader ships an update every 4 weeks, Due.Zero every 10 months. The most recent releases landed on October 6, 2026 and October 4, 2026 respectively.

## The numbers

| Metric | OpenDocument Reader | Due.Zero |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.5 (905 ratings)](https://appshunter.io/ios/app/opendocument-reader-view-odt/id1510195065/reviews)** | — |
| Number of ratings | **905** | — |
| Positive reviews | 30.1% of reviews | — |
| In-app purchases | No | No |
| Ads | Yes | **No** |
| Update frequency | **Every 4 weeks** | Every 10 months |
| Monetization | Ad-supported | — |
| Size | 10 MB | 4 MB |
| Requires iOS | **15.0** | 17.6 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Stefl und Taschauer OG](https://appshunter.io/developer/1452061742) | [DUE.ZERO SRL](https://appshunter.io/developer/1545104646) |

## What reviewers say

### OpenDocument Reader

[App page](https://appshunter.io/ios/app/opendocument-reader-view-odt/id1510195065)

View and edit ODT, ODS, and ODP files on your mobile device. Seamlessly open documents from cloud storage or your device's file explorer, with support for password-protected files and keyword searching. Enjoy offline access and basic editing capabilities.

**Highlights:** View ODT, ODS, ODP files, Basic document editing, Open from cloud storage, Password-protected document support, Keyword search and highlighting, Offline functionality, Print documents

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

**In-app purchases:** none

**What reviewers like**

- 👍 Easy to use
- 🚀 Fast file opening
- 💡 Good ODT reader

**What reviewers complain about**

- 🐛 Corrupted files upon editing
- 🐛 Presentation issues with formatting and features
- 🐛 Inability to edit spreadsheets properly

**Reported bugs**

- Corrupted files
- Formatting issues
- Crashes and app closing issues

**Requested features**

- Dark mode option
- Better spreadsheet editing capabilities
- Improved file format compatibility


### Due.Zero

[App page](https://appshunter.io/ios/app/duezero/id1544240205)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is OpenDocument Reader free?

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

### Is Due.Zero free?

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

### Do OpenDocument Reader or Due.Zero have ads?

OpenDocument Reader shows ads; Due.Zero does not.

### Which is updated more often, OpenDocument Reader or Due.Zero?

OpenDocument Reader ships an update every 4 weeks, and Due.Zero every 10 months. Most recently, OpenDocument Reader was updated on October 6, 2026 and Due.Zero on October 4, 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.*