# Exposure SYNC vs 446 Chall

Exposure SYNC and 446 Chall are too close to call on the numbers: across 6 compared parameters — price, update cadence, ads and in-app purchases among them — neither pulls far enough ahead to decide it. What separates them is feature set and interface, not measurable difference.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

Both ship on a similar rhythm, roughly every 2 months. The most recent releases landed on September 8, 2026 and September 10, 2026 respectively.

## The numbers

| Metric | Exposure SYNC | 446 Chall |
| --- | --- | --- |
| Price | Free | Free |
| Positive reviews | 6.7% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 2 months | Every 2 months |
| Monetization | Free | — |
| Size | 18 MB | 53 MB |
| Requires iOS | **11.4** | 12.4 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPod |
| Age rating | 4+ | 17+ |
| Developer | [Ultimate Sports Engineering](https://appshunter.io/developer/1179244787) | [Boom Software](https://appshunter.io/developer/1605457422) |

## What reviewers say

### Exposure SYNC

[App page](https://appshunter.io/ios/app/exposure-sync/id1436503167)

Control your bike lights with custom burn times and lumen outputs. This app allows simultaneous command of helmet and handlebar lights for ultimate smart control via Bluetooth.

**Highlights:** Bluetooth connectivity, Customizable programs, Adjustable burn time, Adjustable lumen output, Simultaneous light control, Remote setup

**Features:** macOS Compatibility

**In-app purchases:** none


### 446 Chall

[App page](https://appshunter.io/ios/app/446-chall/id6744690098)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Exposure SYNC free?

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

### Is 446 Chall free?

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

### Do Exposure SYNC or 446 Chall have ads?

Neither Exposure SYNC nor 446 Chall shows ads.

### Which is updated more often, Exposure SYNC or 446 Chall?

Exposure SYNC ships an update every 2 months, and 446 Chall every 2 months. Most recently, Exposure SYNC was updated on September 8, 2026 and 446 Chall on September 10, 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.*