# Flash Sync vs JSOU

The clearest difference is review sentiment: JSOU at 100% against Flash Sync's 50%. JSOU also leads on rating (5.0 vs 4.5) and in-app purchases (none vs 3). Flash Sync's advantage is update cadence (every 5 weeks vs every 5 months) and ratings volume (161 vs 5). On price and device support there is nothing between them.

Both are free to download. Flash Sync sells 3 in-app purchases, starting at $0.99 per month. JSOU asks for nothing beyond the download.

JSOU holds the better App Store score, 5.0 against 4.5. That said, the two scores are not equally well evidenced: Flash Sync has 161 ratings behind it against 5, so its average is the more settled of the two. Written reviews point the same way: 50% of Flash Sync's written reviews are positive against 100% of JSOU's.

Flash Sync ships an update every 5 weeks, JSOU every 5 months. The most recent releases landed on October 7, 2026 and October 2, 2026 respectively.

## The numbers

| Metric | Flash Sync | JSOU |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [4.5 (161 ratings)](https://appshunter.io/ios/app/flash-sync-light-show-strobe/id1021930682/reviews) | **[5.0 (5 ratings)](https://appshunter.io/ios/app/jsou/id1526967827/reviews)** |
| Number of ratings | **161** | 5 |
| Positive reviews | 50.0% of reviews | **100.0% of reviews** |
| In-app purchases | Yes | **No** |
| Ads | Yes | **No** |
| Update frequency | **Every 5 weeks** | Every 5 months |
| Monetization | Free with in-app purchases | **Free** |
| Size | 16 MB | 56 MB |
| Requires iOS | 15.6 | **10.0** |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 17+ |
| Developer | [Sounak Sarkar](https://appshunter.io/developer/938584928) | [Jain Samaj Of U S A , Inc.](https://appshunter.io/developer/1526967829) |

## What reviewers say

### Flash Sync

[App page](https://appshunter.io/ios/app/flash-sync-light-show-strobe/id1021930682)

Transform any space into a vibrant party atmosphere. This app synchronizes your device's flashlight with the beats of any audio file, creating a dynamic light show. It also offers screen blinking for devices without a flashlight and advanced features through a premium subscription.

**Highlights:** Flashlight sync with audio beats, Screen blinking for non-flashlight devices, Play any audio file, Microphone input, Five different visual modes, Sync multiple devices, External speaker support

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

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Premium Monthly | $0.99 | per month |
| Premium Yearly | $5.99 | per year |
| Remove advertisements | $0.99 | one-time |


### JSOU

[App page](https://appshunter.io/ios/app/jsou/id1526967827)

This app keeps members of a specific religious community informed about upcoming events and organizational updates. It serves as a digital platform to connect devotees and ensure timely dissemination of information.

**Highlights:** Event notifications, Organizational updates, Community information, Digital communication

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Flash Sync free?

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

### Is JSOU free?

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

### Which has better reviews, Flash Sync or JSOU?

JSOU is rated higher. Flash Sync averages 4.5 out of 5 from 161 ratings, while JSOU averages 5.0 from 5 ratings.

### Do Flash Sync or JSOU have ads?

Flash Sync shows ads; JSOU does not.

### Which is updated more often, Flash Sync or JSOU?

Flash Sync ships an update every 5 weeks, and JSOU every 5 months. Most recently, Flash Sync was updated on October 7, 2026 and JSOU on October 2, 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.*