TWDIW vs Lens Smudge Detection
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
TWDIW
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TWDIW is like a digital version of a physical wallet. Users can freely store various credentials or cards in the TWDIW app on their mobile devices. When identity verification is required, users do not need to carry physical credentials or cards; instead, they can use the TWDIW app on their mobile devices to choose which credential or card to present to third parties for identity verification and authorize access to specific identity data. From traditional physical identification to electronic forms, and now to digital identity integrated with mobile devices, the TWDIW app serves as a digital public infrastructure. It can store not only government-issued credentials, but also diplomas and other academic documents issued by schools, employee IDs and membership cards issued by enterprises, professional language certificates, and transit cards. In the future, more items can also be added to the TWDIW app, further expanding its range of applications. In addition, to enhance the transparency and security of the TWDIW app, MODA plans to open the source code for public review in the future. The security of the TWDIW app depends on various factors, including system design, encryption technology, and user behavior. Generally, the TWDIW app provides a relatively secure environment through multi-factor authentication and biometric verification, users are still advised to regularly update their software and avoid using public Wi-Fi networks for sensitive operations. The TWDIW app adopts the GuardSquare DexGuard solution to protect against static analysis, dynamic analysis, and runtime attacks, thereby preventing malicious exploitation of the TWDIW app. The TWDIW app will pass the third-party Mobile Application Security (MAS) testing (Category L2: User identity authentication) and obtain the certification mark to ensure application security.
Lens Smudge Detection
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This app can detect images taken with dirt or foreign objects on the lens. Dirt refers to anything covering the lens, such as fingerprints or raindrops, which can cause blurring or haze in images. This feature helps you find the best frames from a set of videos or images. The Lens Smudge Detection results display a confidence score from 0.0 to 1.0. This indicates the likelihood that there was dirt or a malfunction on the lens at the time of shooting. A confidence score of 1.0 means there is a very high probability that dirt or foreign objects were on the lens at the time of shooting. Running the app requires a device with A14 Bionic chips(iPhone 12) and later.
Screenshots
Verdict
The clearest difference is ads: TWDIW at none against Lens Smudge Detection's shown. TWDIW also leads on iOS requirement (13.0 vs 26.5). Lens Smudge Detection's advantage is update cadence (weekly vs every 3 weeks). On price, in-app purchases and device support 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
Both are free to download. Neither carries in-app purchases, so what you see is what you pay.
TWDIW ships an update every 3 weeks, Lens Smudge Detection weekly. Both last shipped on October 25, 2026.
| Parameter | TWDIW | Lens Smudge Detection |
|---|---|---|
| Price | Free | Free |
| Update frequency | Every 3 weeks | Weekly — better |
| Ads | No — better | Yes |
| In-app purchases | No | No |
| Devices | iPhone, iPod — better | iPhone |
| Requires iOS | 13.0 — better | 26.5 |
| Further details — not scored | ||
| Size | 200 MB | 42 MB |
| Age rating | 4+ | 4+ |
| Developer | 數位發展部 | Hideaki Uchikoshi |
In-app purchases
TWDIW
No in-app purchases
Lens Smudge Detection
No in-app purchases
Questions
Is TWDIW free?
Is Lens Smudge Detection free?
Do TWDIW or Lens Smudge Detection have ads?
Which is updated more often, TWDIW or Lens Smudge Detection?
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