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FastStone Image Viewer vs SeaMonster

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

FastStone Image Viewer icon
FastStone Image Viewer
SeaMonster icon
SeaMonster

FastStone Image Viewer vs SeaMonster: The Verdict

Last updated: May 2026 · Comparison by Sugggest Editorial Team

Feature FastStone Image Viewer SeaMonster
Sugggest Score
Category Photos & Graphics Development
Pricing Open Source

Product Overview

FastStone Image Viewer
FastStone Image Viewer

Description: FastStone Image Viewer is a free, lightweight image viewing and organizing program. It has an intuitive interface and supports a wide range of image formats like JPEG, GIF, PNG, BMP as well as raw formats from major DSLRs. Useful features include batch editing tools, screen capture, color schemes, and the ability to view images in full screen slideshows.

Type: software

SeaMonster
SeaMonster

Description: SeaMonster is an open-source web browser testing tool used for analysing website content. It allows users to evaluate aspects like accessibility, links, load performance and more through automated checks.

Type: software

Pricing: Open Source

Key Features Comparison

FastStone Image Viewer
FastStone Image Viewer Features
  • Supports all major image formats (JPEG, TIFF, PNG, GIF, BMP, PCX, TGA, WMF, ICO, etc)
  • Powerful image viewing features (zooming, panning, rotating, scrolling, drag-and-drop, etc)
  • Many image processing tools (resize, crop, color adjustments, add text/watermark, etc)
  • Batch conversion tools for converting images between formats, resizing, renaming, etc
  • Screen capture tool
  • Slideshow function
  • Basic image editing (brightness, contrast, saturation, etc)
  • Support for RAW files
  • Thumbnail preview pane
  • EXIF and IPTC metadata viewer
SeaMonster
SeaMonster Features
  • Web accessibility testing
  • Page speed insights
  • Broken link checking
  • SEO analysis
  • JavaScript error checking

Pros & Cons Analysis

FastStone Image Viewer
FastStone Image Viewer
Pros
  • Free and open source
  • Intuitive and easy to use interface
  • Fast and lightweight
  • Supports many image formats
  • Lots of useful viewing, editing and organizing features
Cons
  • Lacks some advanced editing features of paid software
  • No cloud sync or storage features
  • No mobile app version
  • Limited batch editing capabilities compared to Lightroom
SeaMonster
SeaMonster
Pros
  • Open source
  • Easy to use
  • Customizable checks
  • Integrates with Selenium
Cons
  • Limited reporting
  • No browser extension
  • Requires technical knowledge

Pricing Comparison

FastStone Image Viewer
FastStone Image Viewer
  • Not listed
SeaMonster
SeaMonster
  • Open Source

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