# Kiren by F vs Bitdefender Mobile Security

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.

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.

## The numbers

| Metric | Kiren by F | Bitdefender Mobile Security |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [4.6 (107K ratings)](https://appshunter.io/ios/app/kiren-by-f-secure/id434893913/reviews) | **[4.7 (39K ratings)](https://appshunter.io/ios/app/bitdefender-mobile-security/id1255893012/reviews)** |
| Number of ratings | **107K** | 39K |
| Positive reviews | **56.9% of reviews** | 46.2% of reviews |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | Every 6 weeks | **Weekly** |
| Monetization | Free with in-app purchases | Free with in-app purchases |
| Best chart rank | **#159** | #186 |
| Size | 140 MB | 185 MB |
| Requires iOS | 18.0 | **13.0** |
| Devices | iPhone, iPad | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [F-Secure Corporation](https://appshunter.io/developer/425351654) | [Bitdefender SRL](https://appshunter.io/developer/384899757) |

## What reviewers say

### Kiren by F

[App page](https://appshunter.io/ios/app/kiren-by-f-secure/id434893913)

**Currently charting:** #159 Top Grossing · Utilities (US App Store)

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.

**Highlights:** 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

**Features:** Safari Extension, Vision Pro support

**In-app purchases (10)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Lookout Premium | $2.99 | per month |
| Mobile Security Premium | $4.99 | per month |
| Lookout Premium Plus | $9.99 | per month |
| Lookout Premium Plus Trial | $9.99 | per month |
| Lookout Premium Plus | $9.99 | per month |
| Lookout Premium | $29.99 | per year |
| Lookout Premium | $29.99 | per year |
| Lookout Premium Plus | $59.99 | per year |
| Lookout Premium Plus | $99.99 | per year |
| Lookout Premium Plus | $99.99 | per year |

**What reviewers like**

- 🚀 Exceptional app
- 🔒 Safe and secure
- 🔒 Excellent protection
- 🚀 Reliable and stable
- 🔒 Keeping me safe online

**What reviewers complain about**

- 🐛 Crashes all the time
- 🐛 Not working
- 🐛 Lookout upgrades without consent
- 🐛 Impossible to cancel
- 🐛 Cancels ad-blockers

**Reported bugs**

- Lookout app not working on iPhone 11
- Notifications not working
- Subscription issues
- Locating feature not working
- VPN disconnection issues

**Requested features**

- Ability to contact support
- Malware detection and removal
- Real-time phone/app scanning
- Security report generation
- Dark mode option


### Bitdefender Mobile Security

[App page](https://appshunter.io/ios/app/bitdefender-mobile-security/id1255893012)

**Currently charting:** #186 Top Grossing · Utilities (US App Store)

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.

**Highlights:** Scam Protection, Web Protection, Security Scan, Account Privacy, Essential VPN Protection, Real-time threat monitoring

**Features:** Vision Pro support

**In-app purchases (8)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Mobile Security Monthly | $3.99 | per month |
| Monthly Premium VPN | $6.99 | per month |
| Total Security Monthly | $9.99 | per month |
| Mobile Security Yearly | $29.99 | per year |
| Mobile Security Yearly | $29.99 | per year |
| Yearly Premium VPN | $69.99 | per year |
| Total Security Yearly | $109.99 | per year |
| Ultimate Security Individual Yearly | $159.99 | per year |

**What reviewers like**

- 🚀 Great security
- 🔒 Protects against scams and malware
- 👍 Easy to use
- 🚀 Reliable VPN connection
- 🔒 Keeps devices safe

**What reviewers complain about**

- 🐛 Frequent disconnections of VPN and web protection
- 🔋 Drains battery quickly
- 🐛 Interferes with other apps and services
- 🐛 Buggy and unreliable
- 💰 Expensive for limited features

**Reported bugs**

- Web protection randomly turning off
- VPN connection issues and errors
- Compatibility problems with iOS devices
- Subscription and billing problems

**Requested features**

- Automatic web protection and VPN connection
- Better integration with other apps
- More transparent pricing and subscription model
- Improved customer support


## Frequently asked questions

### Is Kiren by F free?

Kiren by F is free to download, with in-app purchases available.

### Is Bitdefender Mobile Security free?

Bitdefender Mobile Security is free to download, with in-app purchases available.

### Which has better reviews, Kiren by F or Bitdefender Mobile Security?

Bitdefender Mobile Security is rated higher. Kiren by F averages 4.6 out of 5 from 107K ratings, while Bitdefender Mobile Security averages 4.7 from 39K ratings.

### Do Kiren by F or Bitdefender Mobile Security have ads?

Neither Kiren by F nor Bitdefender Mobile Security shows ads.

### Which is updated more often, Kiren by F or Bitdefender Mobile Security?

Kiren by F ships an update every 6 weeks, and Bitdefender Mobile Security weekly. Most recently, Kiren by F was updated on November 1, 2026 and Bitdefender Mobile Security on November 1, 2026.

### Which is more popular, Kiren by F or Bitdefender Mobile Security?

Kiren by F currently peaks at #159 in the App Store charts, and Bitdefender Mobile Security at #186. Chart position reflects recent download velocity rather than total install base.

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*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*