台灣自來水 vs TWDIW
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
台灣自來水
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***建議使用者需安裝至最新作業系統版本。*** 商店資訊聯絡詳細資料: 1. 電子郵件地址: twcmobile@mail.water.gov.tw 2. 網站: https://www.water.gov.tw 台灣自來水股份有限公司,簡稱:台水、台水公司,是臺灣最大的自來水供應機構,本APP主要的功能特色如下: 1. 水費查詢 2. 帳單繳費 3. 線上申辦 4. 申請電子帳單 5. 發票查詢 6. 服務據點
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.
Screenshots
Verdict
台灣自來水 and TWDIW are too close to call on the numbers: across 6 compared parameters — price, update cadence, ads and in-app purchases among them — neither pulls far enough ahead to decide it. What separates them is feature set and interface, not measurable difference.
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.
台灣自來水 ships an update every 2 weeks, TWDIW every 3 weeks. The most recent releases landed on October 24, 2026 and October 25, 2026 respectively.
| Parameter | 台灣自來水 | TWDIW |
|---|---|---|
| Price | Free | Free |
| Rating | 1.3 (4 ratings) — better | — |
| Positive reviews | 13.0% of reviews | — |
| Number of ratings | 4 — better | — |
| Update frequency | Every 2 weeks — better | Every 3 weeks |
| Ads | No | No |
| In-app purchases | No | No |
| Devices | iPhone, iPad, iPod — better | iPhone, iPod |
| Requires iOS | 12.0 — better | 13.0 |
| Further details — not scored | ||
| Size | 37 MB | 200 MB |
| Age rating | 17+ | 4+ |
| Developer | 台灣自來水公司 | 數位發展部 |
In-app purchases
台灣自來水
No in-app purchases
TWDIW
No in-app purchases








