# SISTER 進發 vs AY SelfProtect

The clearest difference is update cadence: SISTER 進發 at every 5 weeks against AY SelfProtect's every 3 months. On price, ads, in-app purchases and device support there is nothing between them.

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

SISTER 進發 ships an update every 5 weeks, AY SelfProtect every 3 months. The most recent releases landed on September 8, 2026 and September 7, 2026 respectively.

## The numbers

| Metric | SISTER 進發 | AY SelfProtect |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 5 weeks** | Every 3 months |
| Size | 18 MB | 9 MB |
| Requires iOS | **13.0** | 14.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPod |
| Age rating | 4+ | 17+ |
| Developer | [GT MARKET CONSULTING CO., LTD.](https://appshunter.io/developer/927846054) | [anozrway](https://appshunter.io/developer/1785222077) |

## What reviewers say

### SISTER 進發

[App page](https://appshunter.io/ios/app/sister/id1198930609)

**Features:** macOS Compatibility

**In-app purchases:** none


### AY SelfProtect

[App page](https://appshunter.io/ios/app/ay-selfprotect/id6739428629)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is SISTER 進發 free?

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

### Is AY SelfProtect free?

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

### Do SISTER 進發 or AY SelfProtect have ads?

Neither SISTER 進發 nor AY SelfProtect shows ads.

### Which is updated more often, SISTER 進發 or AY SelfProtect?

SISTER 進發 ships an update every 5 weeks, and AY SelfProtect every 3 months. Most recently, SISTER 進發 was updated on September 8, 2026 and AY SelfProtect on September 7, 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.*