Comparison

Smart Case vs Plain|騒音を検知して環境音を自動再生

Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.

Head to head
About

Smart Case

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
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Through the Smart Case "Smart Phone Case" app, you can sync your favorite photos, text, QR codes, to-do lists, calendars, and weather to the e-ink screen on your phone case and display them. It comes with many interesting and practical theme wallpapers: popular memes, touching copy, motivational quotes, work lists, cartoons, national style graphics and texts, and anime, everything you need is here. DIY Dynamic View: You can add your favorite images and text, and freely set the font, color, direction, and size to create a unique dynamic view for yourself. Using an e-ink screen image quality enhancement algorithm, four-color display, clearer details and edges, more natural gradients, presenting illustrations and portraits closer to the real effect. Convenient Code Display: It's very tedious to open various QR codes every day. You can transfer your frequently used QR codes to the e-ink screen on the phone case for display, and scan the code by showing the e-ink screen. WeChat QR code, payment code, service code can all be scanned. Improve Work and Life Efficiency: You can import to-do items, schedules, business cards, and other information to the e-ink screen to improve work and life efficiency.

About

Plain|騒音を検知して環境音を自動再生

Features
Read full description

Plain は、周囲の音量を検知し、一定以上うるさくなったときだけ環境音を再生するアプリです。 乾燥機音や換気扇音のようなシンプルな音で、気になる生活音をやわらげ、作業や勉強に集中しやすい環境づくりをサポートします。 主な機能 ・騒音を検知して自動再生 ・DRY / VENT の2種類の音を選択可能 ・感度を3段階で調整可能 ・必要なときは手動再生にも対応 ・黒ベースの静かなミニマルUI Plain は必要なときだけ音で環境を整え、集中しやすい空気をつくることを目指しています。

Screenshots

Smart Case3 screens
Plain|騒音を検知して環境音を自動再生4 screens

Verdict

The call

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.

Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS

CostPrice · In-app purchases · Ads · Monetization

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

UpkeepUpdate frequency

Both ship on a similar rhythm, roughly weekly. The most recent releases landed on October 16, 2026 and October 14, 2026 respectively.

Scorecard1 real difference · 9 level
Smart Case versus Plain|騒音を検知して環境音を自動再生: the parameters behind the verdict, then further details
ParameterSmart CasePlain|騒音を検知して環境音を自動再生
PriceFreeFree
Rating3.0 (2 ratings) — better—
Positive reviews50.0% of reviews—
Number of ratings2 — better—
Update frequencyWeeklyWeekly
AdsNoNo
In-app purchasesNoNo
MonetizationFree—
DevicesiPhone, iPod — betteriPhone
Requires iOS14.0 — better26.2
Further details — not scored
Size13 MB12 MB
Age rating9+4+
Developer波 宁KIICHI STUDIO

In-app purchases

None

Smart Case

No in-app purchases

None

Plain|騒音を検知して環境音を自動再生

No in-app purchases

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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