Online scams have never been more convincing. A store that looks real but never ships the order. A text that looks like it comes from your bank. A video of someone who never said those words. These are not aimed only at the careless. They are built to catch anyone, on an ordinary day, in the middle of an ordinary purchase or message.
Kiren is a digital safety app from F-Secure, made for exactly these moments. It helps you tell what is real from what is fake, and it keeps watch over your personal information.
F-SECURE MOBILE SECURITY IS NOW KIREN
Kiren is the next version of F-Secure Mobile Security, built by the same team and completely redesigned. Your existing subscription carries over automatically. Sign in with the same email address you used before and your protection is active. There is nothing to buy again and no change in price.
CHECK BEFORE YOU ACT
• Link Checker: Confirm whether a link is safe before you open it. Shopping sites get a trust rating, useful before buying from an unfamiliar store.
• Message Checker: Paste in a suspicious text and find out in seconds whether it shows signs of a scam.
• Breach Check: See whether an email address has appeared in a known data breach.
• Quick Access to find, lock or wipe your lost device.
PROTECTION THAT RUNS IN THE BACKGROUND (Kiren Plus)
• Browsing Protection: Prevent cyber-criminals from redirecting you to malicious websites while using Safari browser. Bank and shop with confidence with Safari Browser. Browsing Protection verifies that banking sites are real and rates online stores before you buy.
• Message Protection: Filters scam texts from unknown senders out of your main inbox. Conversations with your contacts are never analyzed.
• Personal data monitoring: Watches your email addresses, phone numbers, payment cards, and identity documents around the clock. If any of them appear in a new breach, you get an alert with full details and step-by-step guidance on what to do.
• Scam Scanner: Upload a screenshot of a listing, an offer, or a photo and Kiren's AI checks it for scam tactics and deepfake manipulation.
• Breach Report: Get timely alerts whenever a company, app or service you use has a data breach along with info about how to best secure your data.
KEEP YOUR DEVICE IN GOOD SHAPE
• Device Health checks that a device lock is set and that iOS is up to date, the two settings that make the biggest difference to everyday safety.
• Recent News keeps you informed about data breaches and current scams.
SEE IT WORKING
Three screens show the whole picture. Overview gives an at-a-glance read on how well protected you are. Activity shows what has been checked and what has been caught over the past week. You shows which personal details are being watched and whether any have been exposed.
BUILT WITH PRIVACY IN MIND
Sign in with your email address and a one-time code. There is no password to remember. Your browsing events and checked messages are stored locally on your device. Watched personal details are shown partly hidden in the app.
FREE AND PLUS
Kiren Free includes Link Checker, Message Checker, Breach Check, Device Health, and security news. Kiren Plus adds Browsing Protection, Message Protection, personal data monitoring, and the Scam & Deepfake Scanner.
Kiren is made by F-Secure, protecting people online since 1988.
Subscription information: If you subscribe through the app, your subscription is charged to your Apple account. It renews automatically at the end of each subscription term unless auto-renewal is turned off at least 24 hours before the end of the current term. Auto-renewal can be turned off at any time in your App Store account settings. Any unused portion of a free trial period, if offered, is forfeited when you purchase a subscription.
Terms of Service: https://www.f-secure.com/en/legal/terms
Privacy Policy: https://www.f-secure.com/en/legal/privacy/kiren
I’m satisfied with the app as a mobile security system. Unfortunately, however, the payment system seems to have a bug. I paid 360yen for a monthly subscription but the app said I paid only 3yen.The support desk said they could adjust the account manually if I would send them a copy of the bill.I don’t want to bother them every month.hope the engineers will fix the problem asap then I will resume the subscription.
プレミアム版解約が分かりづらい
BRAINGATE
プレミアム版自動更新を解約しようと思ったら説明にある「登録をキャンセル」ボタンなんて何処にも見当たらない。これはとても不親切。そこでネットで調べたらなるほど出てきました。iOS端末の「設定」をタップし、「iTunes Store と App Store」を選択画面の上部に表示されている Apple ID をタップ「Apple IDを表示」をタップサインインしていなければ、パスワードを入力してサインイン「登録」をタップ当該アプリを選択「登録をキャンセルする」をタップ「確認」をタップこうすれば良いのね。ここに気付かず困っている人も多いのでは?
iOSアップデート
Koucham
以前のバージョンでは、iOSのアップデートに伴い、「古いバージョンのOSです。iOSをアップデートして下さい」とのアラートが表示され、アプリアイコンにバッジ表示にて、通知もありましたが、かなり前からアラートも通知もなくなりました。iOSのアップデートも感知していない様です。また、アプリ起動にも時間がかかり、インストールはして、随時最新バージョンにアップデートしてはいるものの、メリットが見出せない様になりました。追記(2026.1.31) しかしながら、公開Wi-Fiネットワークに接続した際に、そのネットワークの危険性を通知して、接続を遮断してくれました。VPNを通した接続でしたが、セキュリティの高さには驚きました。再追記(2026.9.10)最近のアップデートにより、再びiOSのアップデートを通知して来る様になりました。アプリ内に「このアプリはKiren by F-Secureに新しい名前が変わる。」との通知(原文英文)が来ています。今はまだベータ版段階との事。詳細情報が待たれます。(再々追記2026.10.1)Kirenにアップデートしましたが、日本語対応していません。早く日本語対応お願い致します!(追記2026.10.30) 最新のバージョンにアップデートしました。言語選択が可能になり、日本語対応もして頂けました。ありがとうございます!