# iSmart Light vs DuoSync

The clearest difference is in-app purchases: iSmart Light at none against DuoSync's 3. iSmart Light also leads on update cadence (every 2 months vs every 5 months) and iOS requirement (11.0 vs 15.1). On price, ads and device support there is nothing between them.

Both are free to download. DuoSync sells 3 in-app purchases, starting at $1.99 per 7 days. iSmart Light asks for nothing beyond the download.

iSmart Light ships an update every 2 months, DuoSync every 5 months. The most recent releases landed on November 3, 2026 and November 5, 2026 respectively.

## The numbers

| Metric | iSmart Light | DuoSync |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | **Every 2 months** | Every 5 months |
| Size | 217 MB | 99 MB |
| Requires iOS | **11.0** | 15.1 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPod |
| Age rating | 4+ | 17+ |
| Developer | [Shenzhen Topband Software Technology Co., Ltd](https://appshunter.io/developer/1577897057) | [Three Four Sarl](https://appshunter.io/developer/1677067203) |

## What reviewers say

### iSmart Light

[App page](https://appshunter.io/ios/app/ismart-light/id1577897055)

**Features:** macOS Compatibility

**In-app purchases:** none


### DuoSync

[App page](https://appshunter.io/ios/app/duosync-couples-questions/id6754511199)

**Features:** macOS Compatibility

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| DuoSync Weekly | $1.99 | per 7 days |
| DuoSync Monthly | $4.99 | per month |
| DuoSync Yearly | $44.99 | per year |


## Frequently asked questions

### Is iSmart Light free?

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

### Is DuoSync free?

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

### Do iSmart Light or DuoSync have ads?

Neither iSmart Light nor DuoSync shows ads.

### Which is updated more often, iSmart Light or DuoSync?

iSmart Light ships an update every 2 months, and DuoSync every 5 months. Most recently, iSmart Light was updated on November 3, 2026 and DuoSync on November 5, 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.*