# AV Flash Sync vs Onyx

The clearest difference is in-app purchases: Onyx at none against AV Flash Sync's 1. AV Flash Sync's advantage is ads (none vs shown) and device support (3 vs 1). On price there is nothing between them.

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

## The numbers

| Metric | AV Flash Sync | Onyx |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[1.0 (1 ratings)](https://appshunter.io/ios/app/av-flash-sync/id1207980707/reviews)** | — |
| Number of ratings | **1** | — |
| Positive reviews | 0.0% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | **No** | Yes |
| Update frequency | Every 19 months | — |
| Monetization | Free with in-app purchases | — |
| Size | 1 MB | 29 MB |
| Requires iOS | **12.0** | 18.0 |
| Devices | **iPhone, iPad, iPod** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [náhodný](https://appshunter.io/developer/431797361) | [David Azancot](https://appshunter.io/developer/507868249) |

## What reviewers say

### AV Flash Sync

[App page](https://appshunter.io/ios/app/av-flash-sync/id1207980707)

Enhance your AV media recordings with a one-second tone and red flash. This tool aids in synchronizing audio and video during post-production, streamlining your workflow.

**Highlights:** Add one-second tone, Add red flash, Synchronize audio and video, Post-production tool, Media recording enhancement

**Features:** macOS Compatibility

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Flash Sync Pro | $2.99 | one-time |


### Onyx

[App page](https://appshunter.io/ios/app/onyx-private-ai-chat/id6770044762)

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

**In-app purchases:** none


## Frequently asked questions

### Is AV Flash Sync free?

AV Flash Sync is free to download, with in-app purchases available.

### Is Onyx free?

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

### Do AV Flash Sync or Onyx have ads?

Onyx shows ads; AV Flash Sync does not.

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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.*