KeyLemon

KeyLemon is a simple utility to log on to your personal Windows account by using your face. If your computer has multiple users, the software automatically logs you into the right account.

Note: This app has been discontinued.

When you leave the computer, it will automatically lock it and then unlock it when you are back. It also tracks your face evolution by automatically saving one image day after day. You can then export and share this movie with your friends.



KeyLemon protects your Windows computer against hijackers (permanent protection) and allows you to unlock (or resume from sleep) with face recognition. Just download the program, create your face model, and unlock your session simply and conveniently with KeyLemon.

How does it work? The app is a simple solution that checks that you are behind your computer. When you leave the computer, it will automatically lock it and then unlock it when you are back. It takes a picture of the hijackers who tried to access your computer when you leave it.

FAQs

What is KeyLemon used for?
KeyLemon is a facial recognition software that allows users to log into their computer using a webcam instead of a password. It was designed to enhance convenience and add an extra layer of security by recognizing the user’s face.

Is KeyLemon still being developed?
No. KeyLemon is no longer actively developed or maintained. Updates and official support have been discontinued, and the software has not kept pace with modern operating system changes or newer security standards.

Is KeyLemon still relevant in 2026?
Not really. In 2026, KeyLemon is largely outdated. Modern operating systems such as Windows now include built-in biometric authentication solutions (e.g., Windows Hello) that are more secure, better optimized, and actively supported. Because KeyLemon is no longer maintained, it may have compatibility or security limitations on newer systems.

Is KeyLemon secure?
At the time of its active development, KeyLemon provided basic facial recognition security. However, compared to modern biometric systems that use advanced hardware sensors (like infrared cameras and depth sensors), it may not meet today’s security expectations.

Should you use KeyLemon today?
For modern systems in 2026, it is generally better to use built-in biometric solutions or actively supported authentication tools. KeyLemon may still function on older systems, but it is not considered a current or future-proof solution.

System Requirements

• Intel Processor (Core 2 Duo (64-bit capable))
• 1 GB RAM
• 100 MB hard drive space
• Integrated webcam (laptop) or USB webcam
• USB microphone or integrated microphone (laptop) to use speaker recognition
• Internet connection for activation

PROS

• Facial recognition for quick login
• Voice recognition as an alternative access
• Automatic locking when the user is absent
• Captures images of unauthorized access attempts
• User-friendly interface with easy setup

CONS

• No longer under active development.
• Vulnerable to photo-based spoofing attacks
• Inconsistent performance in varied lighting
• Limited configuration for individual users
• Potential compatibility issues with newer Windows versions
• High false acceptance rate under certain conditions

Note: Limited functionality in the demo version. 7-day trial version.

Also Available: Download KeyLemon for Mac