Kiren by F vs Bitdefender Mobile Security
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Kiren by F
This app helps you identify and avoid online scams, from fake websites and texts to deepfake videos. It monitors your personal information for data breaches and provides tools to secure your device. Stay safe while browsing, shopping, and communicating online.
- Link Checker for website safety
- Message Checker for scam texts
- Breach Check for email exposure
- Personal data monitoring
- Scam Scanner with AI
- Device Health checks
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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
Bitdefender Mobile Security
This app provides advanced protection against digital threats, including phishing attempts, malicious websites, and data breaches. It offers features like scam protection, web protection, security scans, and account privacy checks to keep your device and personal information safe.
- Scam Protection
- Web Protection
- Security Scan
- Account Privacy
- Essential VPN Protection
- Real-time threat monitoring
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Keep your iPhone secure from digital threats with advanced protection that works quietly in the background. Try all premium features free for 7 days — no credit card required. Here’s what you get: Scam Protection - Instantly identifies and blocks phishing attempts in your messages before you can become a victim. - Automatically detects and removes malicious calendar events, eliminating the frustrating "calendar virus." - Protects your personal information from scammers trying to steal your identity or financial details. - Scam Radar, monitors local scam activity, proactively notifying you when new scam waves start spreading nearby Web Protection - Blocks dangerous websites that attempt to steal your passwords and credit card information. - Prevents apps from connecting to malicious servers. - Stops your personal data from being leaked through unsecured connections. - Protects all internet traffic, not just your browsing — so every app you use stays secure. Security Scan - Identifies hidden vulnerabilities in your device settings with a single tap. - Provides simple fixes for security gaps that could expose your personal information. - Ensures your privacy settings are fully optimised to protect sensitive data and give you peace of mind. Account Privacy - Checks if your email address has been exposed in known data breaches. - Alerts you immediately when it’s time to update compromised passwords. - Helps protect your online accounts from unauthorised access and identity theft. Essential VPN Protection - Shields your browsing activity with 200MB of free daily VPN traffic. - Secures sensitive information when connected to public Wi-Fi networks. - Encrypts all your traffic to protect against hackers, trackers, and snoopers. - Upgrade to Premium VPN for unlimited traffic and access to 3000+ servers in over 100 countries. Why Bitdefender? Bitdefender Mobile Security is built on technologies trusted by millions of users worldwide. Enjoy real-time threat monitoring, proactive privacy protection, and award-winning detection rates — all with minimal impact on your device’s performance and battery life. Think your iPhone doesn’t need protection? Think again. iOS devices are not immune to threats. They can still be exposed to phishing attacks, data leaks, malicious apps, unsafe Wi-Fi connections, and breaches of personal information. Bitdefender Mobile Security helps you close hidden vulnerabilities, protect your online identity, and stay safe wherever you are. Important Information: - The payment will be charged to your iTunes Account at confirmation of purchase. - Subscription automatically renews unless auto-renew is turned off at least 24 hours before the end of the current period. - Subscriptions may be managed and auto-renewal turned off by going to your Account Settings after purchase. - You must have or create a Bitdefender account to use this app. Terms of Use: https://www.bitdefender.com/site/view/subscription-agreement.html Privacy Policy: https://www.bitdefender.com/site/view/legal-privacy-policy-for-home-users-solutions.html Download Bitdefender Mobile Security today and experience premium protection free for 7 days — no credit card required. Stay private, stay protected, stay free — and enjoy your iPhone worry-free.
Screenshots
Verdict
The clearest difference is update cadence: Bitdefender Mobile Security at weekly against Kiren by F's every 6 weeks. Bitdefender Mobile Security also leads on iOS requirement (13.0 vs 18.0). Kiren by F's advantage is review sentiment (57% vs 46%). On price, rating, ratings volume and ads 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. Kiren by F sells 10 in-app purchases, starting at $2.99 per month and Bitdefender Mobile Security sells 8 in-app purchases, starting at $3.99 per month. Whichever you choose, the download price is not the number that matters.
On the App Store both sit at effectively the same score — 4.6 for Kiren by F against 4.7 for Bitdefender Mobile Security. Both are backed by a comparable volume of ratings — 107K and 39K respectively. Written reviews are what separate them: 57% of Kiren by F's written reviews are positive against 46% of Bitdefender Mobile Security's.
Kiren by F ships an update every 6 weeks, Bitdefender Mobile Security weekly. Both last shipped on November 1, 2026.
| Parameter | Kiren by F | Bitdefender Mobile Security |
|---|---|---|
| Price | Free | Free |
| Rating | 4.6 (107K ratings) | 4.7 (39K ratings) — better |
| Positive reviews | 56.9% of reviews — better | 46.2% of reviews |
| Number of ratings | 107K — better | 39K |
| Update frequency | Every 6 weeks | Weekly — better |
| Ads | No | No |
| In-app purchases | Yes | Yes |
| Monetization | Free with in-app purchases | Free with in-app purchases |
| Best chart rank | #159 — better | #186 |
| Devices | iPhone, iPad | iPhone, iPad, iPod — better |
| Requires iOS | 18.0 | 13.0 — better |
| Further details — not scored | ||
| Size | 140 MB | 185 MB |
| Age rating | 4+ | 4+ |
| Developer | F-Secure Corporation | Bitdefender SRL |
Customer experience
Kiren by F
Bitdefender Mobile Security
User reviews
Kiren by F
From 107K App Store ratingsWhat we love
- 🚀 Exceptional app
- 🔒 Safe and secure
- 🔒 Excellent protection
- 🚀 Reliable and stable
- 🔒 Keeping me safe online
Room to improve
- 🐛 Crashes all the time
- 🐛 Not working
- 🐛 Lookout upgrades without consent
- 🐛 Impossible to cancel
- 🐛 Cancels ad-blockers
Bitdefender Mobile Security
From 39K App Store ratingsWhat we love
- 🚀 Great security
- 🔒 Protects against scams and malware
- 👍 Easy to use
- 🚀 Reliable VPN connection
- 🔒 Keeps devices safe
Room to improve
- 🐛 Frequent disconnections of VPN and web protection
- 🔋 Drains battery quickly
- 🐛 Interferes with other apps and services
- 🐛 Buggy and unreliable
- 💰 Expensive for limited features
Bugs and requests
Kiren by F
Reported bugs
5 issues- Lookout app not working on iPhone 11
- Notifications not working
- Subscription issues
- Locating feature not working
- VPN disconnection issues
Requested features
5 requests- Ability to contact support
- Malware detection and removal
- Real-time phone/app scanning
- Security report generation
- Dark mode option
Bitdefender Mobile Security
Reported bugs
4 issues- Web protection randomly turning off
- VPN connection issues and errors
- Compatibility problems with iOS devices
- Subscription and billing problems
Requested features
4 requests- Automatic web protection and VPN connection
- Better integration with other apps
- More transparent pricing and subscription model
- Improved customer support
In-app purchases
Kiren by F
- Lookout Premium$2.991 Month
- Mobile Security Premium$4.991 Month
- Lookout Premium Plus2 variants$9.991 Month
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- Lookout Premium Plus Trial1 Month trial$9.991 Month
- Lookout Premium Plus14 Days trial$9.991 Month
- Lookout Premium$29.991 Year
- Lookout Premium1 Year trial$29.991 Year
- Lookout Premium Plus14 Days trial$59.991 Year
- Lookout Premium Plus$99.991 Year
- Lookout Premium Plus1 Year trial$99.991 Year
Bitdefender Mobile Security
- Mobile Security Monthly7 Days trial$3.991 Month
- Monthly Premium VPN$6.991 Month
- Total Security Monthly7 Days trial$9.991 Month
Show 5 moreShow fewer
- Mobile Security Yearly14 Days trial$29.991 Year
- Mobile Security Yearly1 Year trial$29.991 Year
- Yearly Premium VPN$69.991 Year
- Total Security Yearly1 Year trial$109.991 Year
- Ultimate Security Individual Yearly$159.991 Year
Questions
Is Kiren by F free?
Is Bitdefender Mobile Security free?
Which has better reviews, Kiren by F or Bitdefender Mobile Security?
Do Kiren by F or Bitdefender Mobile Security have ads?
Which is updated more often, Kiren by F or Bitdefender Mobile Security?
Which is more popular, Kiren by F or Bitdefender Mobile Security?
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