Trend User growth trend Review user movement across collected snapshots.
User Growth Over Time 2M 2M 2M 2M 2M 2026年7月14日 2026年7月17日 2026年7月20日 Latest: 2M
Rating trend 7-day rating trend View collected rating snapshots from the latest 7-day window to assess rating stability.
7-day rating change 1.18 1.23 1.28 1.33 1.38 2026年7月14日 2026年7月17日 2026年7月20日 Latest: 1.28
2026年7月14日 2026年7月20日
Growth overview Daily, weekly, and monthly growth Compare 1-day, 7-day, and 30-day net growth and growth rate.
Technical snapshot Version, languages, and crawl freshness Review publication date, version, supported languages, and crawl timestamps.
Version --
Manifest --
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Languages 0 Unknown
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No language data
Overview Product summary Review the store description, core capabilities, and common use cases.
ICカードリーダライタが接続されたパソコンからマイナンバーカードを利用したe-Taxへのログインや、電子証明書の発行機関が提供するICカードを利用した申告・申請等データへの署名、申請データ作成時のCSVファイル等を読込む機能等を提供するアプリケーションです。
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AI product read Chrome extension that bridges the Japanese e-Tax web application with a native Windows application and IC card reader for My Number card authentication and digital signing Enables Japanese taxpayers to log into the government's e-Tax electronic tax filing system and digitally sign tax filings/applications using their My Number card and IC card reader through Chrome, which otherwise cannot directly access hardware card readers
User installs the extension and a companion native Windows app. When visiting e-Tax websites (login.e-tax.nta.go.jp, keisan.nta.go.jp, etc.), the content script injects hidden elements for communication. The web page dispatches custom events (NtaChromeLaunch) which the content script relays to the background script, which forwards messages to the native app via native messaging. The native app interfaces with the IC card reader to read the My Number card, perform authentication, and return signed data back through the chain.
Connect to native Windows app (nta.chrome.ext) via Chrome native messaging for IC card reader communication Enable My Number card-based login to e-Tax (login.e-tax.nta.go.jp) Facilitate digital signing of tax filings and applications using electronic certificates on the card Support CSV file loading for tax application data preparation Bridge communication between e-Tax web pages and the native card reader application
Target users Japanese individual taxpayers filing taxes electronically via e-Tax / Japanese tax professionals and accountants / Businesses using e-Tax for corporate tax filings / Users with My Number cards and IC card readers Chrome Web Store detail was unavailable (API error), so no store description or rating info could be cross-referenced Cannot verify the native Windows companion app (nta.chrome.ext) as it is distributed separately by the National Tax Agency Cannot confirm whether the extension works without the native companion app installed Monetization No paid features detected This is an official free government extension from Japan's National Tax Agency (国税庁). No payment, subscription, license, premium, upgrade, or billing-related code was found in any source file. The e-Tax system is a free public service for Japanese taxpayers. The extension has no feature gating or paid tier.
Confidence 98
Payment platform --
Source AI / High
Login required Yes
Reason The extension is a bridge to Japan's e-Tax system (login.e-tax.nta.go.jp and related domains). Users must log in to e-Tax using a physical My Number card (マイナンバーカード) and IC card reader. The extension itself has no login UI or account system—it facilitates the connection between the e-Tax web app and a native Windows application that reads the card. The login is required at the destination service (e-Tax) to use the extension's core workflow. Permission risk Low-risk permissions This estimate uses declared permissions and host permissions to assess access scope and sensitivity.
LOW
Publisher Unknown publisher Independent publisher
Email --
Phone --
Address -- Permissions No permission data
Host access No host access data
年末調整で生命保険控除証明書を会社に提出しなければならないのに全く動作せず！ やはりペーパーレスでは当てにならない。今から保険会社に郵送してもらっても提出期限に間に合わず、最悪の気分だ。
エラーになりログインすらできない！ 誰が作ったの？このゴミサイト。
全く使えません。 役所利権ご用達ソフトウエアー会社が作ったのでしょうか？電通が儲かる訳だ。 どの程度の予算を組んでこんな低評価のソフトを作れるのかを考えると、税金や社会保障費の増額、この様な企業の延命と天下り先確保の為、血税を使われるとたまりませんね。
お役所仕事（笑）
すべてがわかりづらい上に、使用者のことを何も考えていない自己満足システムということがよくわかるつくりをしています
指示に従ってインストールしたのに、e-Tax のサイトで認識しません。
全く使えません。
何度試してもエラーが出る
2週間前には使えてたのに今日また使おうとしたら何故か認識されずエラーになる 前回使った時も何時間もかけてやっとクリアしたのにまだ同じことの繰り返しですが、 どうか改善していただけないでしょうか。こんなに効率悪いシステム初めて
拡張機能をすでに有効化しているのにエラーメッセージが出る