Kiren by F-Secure

In-app purchases
1.1M reviews
Content rating
Everyone
100M+
Downloads
Content rating
Everyone
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About this app

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 premium 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 identity and your phone.

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.

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.
• Your Apps: Analyse your apps to see exactly what they can access, so you can revoke permissions that put your privacy at risk.
• Quick Access to find, lock or wipe your lost device.

PROTECTION THAT RUNS IN THE BACKGROUND (Kiren Plus)
• Device scan: Antivirus makes it easy to identify, clean & remove viruses from your Android device. It checks new downloads and apps the moment they arrive, runs a daily scan, and removes threats.
• 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.
• Browsing Protection: Prevent cyber-criminals from redirecting you to malicious websites while using Chrome 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: Detects scam messages from unknown senders in SMS and WhatsApp, and gathers the harmful ones in one place. Conversations with your contacts are never analyzed.
• 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 screen lock is set, the first line of defense if your phone is lost or stolen.
• Your Apps shows what each installed app can access, such as the camera, microphone, location, and contacts. An app with more access than it needs stands out.
• Recent News keeps you informed about data breaches and current scams.

BUILT WITH PRIVACY IN MIND
Your browsing events, checked messages, and app analysis are stored locally on your device.

FREE AND PLUS
Kiren Free includes Link Checker, Message Checker, Breach Check, the device lock check, Your Apps, and Security News.
Kiren Plus adds Browsing Protection, Message Protection, antivirus, personal data monitoring, and the Scam & Deepfake Scanner.

Kiren is made by F-Secure, protecting people online since 1988.

THIS APP USES ACCESSIBILITY SERVICES
This app uses Accessibility services. F-Secure uses the respective permissions with active consent from the end user.

The Accessibility permissions are used for the Chrome Protection features, in particular:
• To read website addresses for checking their safety on Chrome.

Kiren uses Android's VpnService for an upcoming web protection feature. When it is available, Kiren will create a local VPN on your device to check website addresses and block harmful sites. This feature is not active yet.
Antivirus, Identity Guard & Scam Protect. F-Secure Mobile Security is now Kiren.
Updated on
Oct 13, 2026

Data safety

Safety starts with understanding how developers collect and share your data. Data privacy and security practices may vary based on your use, region, and age. The developer provided this information and may update it over time.
  • This app may share these data types with third parties
    Personal info
  • This app may collect these data types
    Location, Personal info and 4 others
  • Data is encrypted in transit
  • You can request that data be deleted

Ratings and reviews

1.06M reviews
T V
May 26, 2024
I've been using lookout on my devices for 2 decades. Whenever I wanted to be sure I could open it up and do a scan. Now, for the past month, it is almost always unusable. When I open it up, the page that pitches the paid version obscures the functional page, so I can't run a scan. I guess they think annoying me is the way to make a sale. In the past, I have considered paying. Now; NEVER.
446 people found this review helpful
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Sue D.
March 19, 2024
After many years of trusting Lookout for free, and after a new company took over with high disappointment I am obliged to engage in a free trial and then be charged if you continue. They in an "aggressive" manner don't let you even have the free trial without entering all your info plus payment method; you can't leave the screen. This is unbelievable. I was very satisfied with Lookout, but not now that they not consider who has it for years without any notice that the app is not free anymore.
154 people found this review helpful
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Nathan Detroit
May 27, 2024
As many people point out, you can't even access the interface without signing up for the free trial. This is the WORST development of any product I've used - Greed run rampant. If you can't support a free version, don't offer this junk. The app also randomly stops now, I suspect just to force users to the impassable "buy" screen. I have to trust that it's actually doing anything until I find a good alternative. I'd say "Lookout" for this shoddy outfit and avoid any of their products.
173 people found this review helpful
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What’s new

F-Secure Mobile Security is now Kiren!
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This update makes Kiren Plus setup smoother, improves reliability, and includes bug fixes and performance improvements.