# Smart Case vs Plain｜騒音を検知して環境音を自動再生

The clearest difference is iOS requirement: Smart Case at 14.0 against Plain｜騒音を検知して環境音を自動再生's 26.2. 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 weekly. The most recent releases landed on October 16, 2026 and October 14, 2026 respectively.

## The numbers

| Metric | Smart Case | Plain｜騒音を検知して環境音を自動再生 |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[3.0 (2 ratings)](https://appshunter.io/ios/app/smart-case-nfc-ink-screen/id6502571771/reviews)** | — |
| Number of ratings | **2** | — |
| Positive reviews | 50.0% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Weekly | Weekly |
| Monetization | Free | — |
| Size | 13 MB | 12 MB |
| Requires iOS | **14.0** | 26.2 |
| Devices | **iPhone, iPod** | iPhone |
| Age rating | 9+ | 4+ |
| Developer | [波 宁](https://appshunter.io/developer/1476146486) | [KIICHI STUDIO](https://appshunter.io/developer/1855811809) |

## What reviewers say

### Smart Case

[App page](https://appshunter.io/ios/app/smart-case-nfc-ink-screen/id6502571771)

Personalize your phone case with a dynamic e-ink display. Sync photos, text, QR codes, to-do lists, and weather directly to your case for easy access and improved efficiency.

**Highlights:** Sync photos and text, Display QR codes, Integrate to-do lists and calendars, DIY dynamic views with custom fonts and colors, E-ink screen image enhancement, Import business cards

**Features:** macOS Compatibility

**In-app purchases:** none


### Plain｜騒音を検知して環境音を自動再生

[App page](https://appshunter.io/ios/app/plain/id6761727598)

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

**In-app purchases:** none


## Frequently asked questions

### Is Smart Case free?

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

### Is Plain｜騒音を検知して環境音を自動再生 free?

Plain｜騒音を検知して環境音を自動再生 is free to download, with no in-app purchases.

### Do Smart Case or Plain｜騒音を検知して環境音を自動再生 have ads?

Neither Smart Case nor Plain｜騒音を検知して環境音を自動再生 shows ads.

### Which is updated more often, Smart Case or Plain｜騒音を検知して環境音を自動再生?

Smart Case ships an update weekly, and Plain｜騒音を検知して環境音を自動再生 weekly. Most recently, Smart Case was updated on October 16, 2026 and Plain｜騒音を検知して環境音を自動再生 on October 14, 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.*