# OpenDocument Reader vs ChronoZen

The clearest difference is in-app purchases: OpenDocument Reader at none against ChronoZen's 1. OpenDocument Reader also leads on update cadence (every 3 weeks vs every 8 months) and iOS requirement (15.0 vs 17.0). ChronoZen's advantage is ads (none vs shown). On price and device support there is nothing between them.

Both are free to download. ChronoZen sells 1 one-off in-app purchase. OpenDocument Reader asks for nothing beyond the download.

OpenDocument Reader ships an update every 3 weeks, ChronoZen every 8 months. Both last shipped on October 17, 2026.

## The numbers

| Metric | OpenDocument Reader | ChronoZen |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.5 (908 ratings)](https://appshunter.io/ios/app/opendocument-reader-view-odt/id1510195065/reviews)** | — |
| Number of ratings | **908** | — |
| Positive reviews | 30.1% of reviews | — |
| In-app purchases | **No** | Yes |
| Ads | Yes | **No** |
| Update frequency | **Every 3 weeks** | Every 8 months |
| Monetization | Ad-supported | — |
| Size | 11 MB | 5 MB |
| Requires iOS | **15.0** | 17.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Stefl und Taschauer OG](https://appshunter.io/developer/1452061742) | [Tarik Davulcu](https://appshunter.io/developer/1780533379) |

## 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


### ChronoZen

[App page](https://appshunter.io/ios/app/chronozen-adhd-focus-timer/id6759417430)

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Lifetime Pro | $4.99 | one-time |


## Frequently asked questions

### Is OpenDocument Reader free?

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

### Is ChronoZen free?

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

### Do OpenDocument Reader or ChronoZen have ads?

OpenDocument Reader shows ads; ChronoZen does not.

### Which is updated more often, OpenDocument Reader or ChronoZen?

OpenDocument Reader ships an update every 3 weeks, and ChronoZen every 8 months. Most recently, OpenDocument Reader was updated on October 17, 2026 and ChronoZen on October 17, 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.*