# Si vs X

The clearest difference is iOS requirement: Si at 9.1 against X's 12.0. On price, update cadence, ads and in-app purchases there is nothing between them.

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 5 months. The most recent releases landed on September 8, 2026 and September 10, 2026 respectively.

## The numbers

| Metric | Si | X |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 5 months | Every 5 months |
| Size | 12 MB | 52 MB |
| Requires iOS | **9.1** | 12.0 |
| Devices | iPhone, iPod | iPhone, iPod |
| Age rating | 4+ | 17+ |
| Developer | [旭日东方](https://appshunter.io/developer/1472957256) | [Launch Tech Co., Ltd](https://appshunter.io/developer/447568418) |

## What reviewers say

### Si

[App page](https://appshunter.io/ios/app/si-link/id1484583420)

**Features:** macOS Compatibility

**In-app purchases:** none


### X

[App page](https://appshunter.io/ios/app/x-charger/id6478358329)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Si free?

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

### Is X free?

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

### Do Si or X have ads?

Neither Si nor X shows ads.

### Which is updated more often, Si or X?

Si ships an update every 5 months, and X every 5 months. Most recently, Si was updated on September 8, 2026 and X 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.*