# OOReader vs Event Sync

The clearest difference is in-app purchases: Event Sync at none against OOReader's 1. Event Sync also leads on ads (none vs shown) and update cadence (weekly vs every 2 months). On price, device support and iOS requirement there is nothing between them.

Both are free to download. OOReader sells 1 one-off in-app purchase. Event Sync asks for nothing beyond the download.

OOReader ships an update every 2 months, Event Sync weekly. The most recent releases landed on October 23, 2026 and October 21, 2026 respectively.

## The numbers

| Metric | OOReader | Event Sync |
| --- | --- | --- |
| Price | Free | Free |
| Positive reviews | 53.0% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | Yes | **No** |
| Update frequency | Every 2 months | **Weekly** |
| Monetization | Free with in-app purchases | — |
| Size | 37 MB | 51 MB |
| Requires iOS | 16.6 | **15.1** |
| Devices | iPhone, iPad | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [BML Solutions Inc.](https://appshunter.io/developer/349426067) | [Samy QAIS](https://appshunter.io/developer/1885353446) |

## What reviewers say

### OOReader

[App page](https://appshunter.io/ios/app/ooreader/id480844649)

View office documents from various suites, including OpenOffice, LibreOffice, and Microsoft Office formats, as well as PDFs. Convert documents to PDF for easy sharing and printing, with an internet connection required for conversion.

**Highlights:** View ODF, DOCX, XLSX, PPTX, PDF, Convert documents to PDF, Share and print documents, Page-by-page viewing, Search within documents, Password protected document viewing (PRO)

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| OOReader Pro | $3.99 | one-time |

**What reviewers like**

- 👍 Works as advertised
- 🚀 Faithful representation of documents
- 💡 Allows viewing of OpenOffice/LibreOffice docs
- 🚀 Convenient for viewing documents on-the-go
- 👍 Useful for preaching/reading sermons

**What reviewers complain about**

- 🐛 Conversion errors/crashes when opening files
- 🔒 Security concerns with online file conversion
- 🔒 No local viewing, requires internet access
- 🐛 Buggy, unreliable, and unstable
- 🔋 High battery consumption

**Reported bugs**

- Crashes when opening files
- Inconsistent file handling (caching issues)
- Inability to open larger documents
- Compatibility issues with newer iOS versions

**Requested features**

- Add search and delete functions
- Improve handling of password-protected files
- Increase file size/page limit
- Add editing capabilities
- Improve font/formatting preservation


### Event Sync

[App page](https://appshunter.io/ios/app/event-sync/id6790489024)

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

**In-app purchases:** none


## Frequently asked questions

### Is OOReader free?

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

### Is Event Sync free?

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

### Do OOReader or Event Sync have ads?

OOReader shows ads; Event Sync does not.

### Which is updated more often, OOReader or Event Sync?

OOReader ships an update every 2 months, and Event Sync weekly. Most recently, OOReader was updated on October 23, 2026 and Event Sync on October 21, 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.*