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GlassWire vs Preview

Professional comparison and analysis to help you choose the right software solution for your needs.

GlassWire icon
GlassWire
Preview icon
Preview

GlassWire vs Preview: The Verdict

⚡ Summary:

GlassWire: GlassWire is a free network security monitor and analyzer for Windows that visualizes network activity and alerts users to suspicious connections. It tracks bandwidth usage and shows open ports and connections to help identify threats.

Preview: Preview is a free and open-source document viewer application for macOS. It allows quick viewing of multiple file formats including images, PDFs, Markdown files, Office documents, and more. Preview has basic editing capabilities and annotation tools for PDFs.

Both tools serve their respective audiences. Compare the features, pricing, and user ratings above to determine which best fits your needs.

Last updated: May 2026 · Comparison by Sugggest Editorial Team

Feature GlassWire Preview
Sugggest Score — —
Category Security & Privacy Office & Productivity
Pricing — Open Source

Product Overview

GlassWire
GlassWire

Description: GlassWire is a free network security monitor and analyzer for Windows that visualizes network activity and alerts users to suspicious connections. It tracks bandwidth usage and shows open ports and connections to help identify threats.

Type: software

Preview
Preview

Description: Preview is a free and open-source document viewer application for macOS. It allows quick viewing of multiple file formats including images, PDFs, Markdown files, Office documents, and more. Preview has basic editing capabilities and annotation tools for PDFs.

Type: software

Pricing: Open Source

Key Features Comparison

GlassWire
GlassWire Features
  • Real-time network monitoring
  • Firewall to block unwanted connections
  • Alerts for suspicious activity
  • Bandwidth usage monitoring
  • Port scanning detection
  • Shows applications using internet
  • Network history and logging
Preview
Preview Features
  • View PDFs, images, text files and more
  • Annotate PDFs with shapes, text boxes, signatures
  • Basic image editing tools
  • Fill out and sign PDF forms
  • Combine PDFs and export as PDF or other formats
  • Tabbed interface to view multiple files
  • Quick Look support to preview files
  • Built-in screen capture tool

Pros & Cons Analysis

GlassWire
GlassWire

Pros

  • Free version available
  • Easy to use interface
  • Provides useful network insights
  • Can identify potential threats
  • Good for monitoring bandwidth usage

Cons

  • Limited features in free version
  • Can be resource intensive
  • May flag legitimate connections as suspicious
  • No web interface
  • Windows only
Preview
Preview

Pros

  • Free and included with macOS
  • Fast and lightweight
  • Supports many common file formats
  • Useful annotation and editing tools
  • Easy to use interface

Cons

  • Limited functionality compared to paid alternatives
  • Lacks advanced PDF editing features
  • No OCR for scanning text in images
  • No collaboration tools

Pricing Comparison

GlassWire
GlassWire
  • Not listed
Preview
Preview
  • Open Source

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Learn More About Each Product

GlassWire
GlassWire
Reviews, pricing & alternatives →
Preview
Preview
Reviews, pricing & alternatives →

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