Defender Lens vs File Scanning Framework (FSF) v1.1: side-by-side comparison (2026)
Defender Lens is a commercial detection engineering solution by DefenderLens. File Scanning Framework (FSF) v1.1 is a free detection engineering solution. Features, integrations, deployment and the company behind each one, side by side.
Turn Any Threat into a Detection Rule
FSF is a modular, recursive file scanning solution that enables analysts to extend the utility of Yara signatures and define actionable intelligence within a file.
Side-by-side comparison
Feature
Defender Lens
File Scanning Framework (FSF) v1.1
Pricing model
Commercial
Free
Category
Detection Engineering
Detection Engineering
Deployment and fit
Deployment type
Cloud
On-Premises
Company size fit
Mid-Market, Enterprise
Mid-Market, Enterprise
Open source
GitHub stars
–
294
Last commit
–
Jan 2019
Company
Company
DefenderLens
–
Use cases and capabilities
Detection Rules
Yes
No
Rule Management
Yes
No
Attack Detection
Yes
No
Rule Generation
Yes
No
Rule Writing
Yes
No
Rules
Yes
No
Threat Research
Yes
No
Anomaly Detection
Yes
No
Rule Engine
Yes
No
Alerting
Yes
No
Reverse Engineering
No
Yes
File Analysis
No
Yes
Core features
10 features listed
No features listed
Integrations
6 integrations listed
No integrations listed
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