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Open Contacts vs SumatraPDF

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

Open Contacts icon
Open Contacts
SumatraPDF icon
SumatraPDF

Open Contacts vs SumatraPDF: The Verdict

⚡ Summary:

Open Contacts: Open Contacts is an open source contact and customer relationship management platform. It features contact management, task organization, calendaring, and can store relevant customer file attachments.

SumatraPDF: SumatraPDF is a free and open-source PDF, eBook, XPS, DjVu, CHM, Comic Book (CBZ and CBR) reader for Windows. It is lightweight, customizable, and supports many advanced PDF features.

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 Open Contacts SumatraPDF
Sugggest Score — —
Category Business & Commerce Office & Productivity
Pricing Open Source Open Source

Product Overview

Open Contacts
Open Contacts

Description: Open Contacts is an open source contact and customer relationship management platform. It features contact management, task organization, calendaring, and can store relevant customer file attachments.

Type: software

Pricing: Open Source

SumatraPDF
SumatraPDF

Description: SumatraPDF is a free and open-source PDF, eBook, XPS, DjVu, CHM, Comic Book (CBZ and CBR) reader for Windows. It is lightweight, customizable, and supports many advanced PDF features.

Type: software

Pricing: Open Source

Key Features Comparison

Open Contacts
Open Contacts Features
  • Contact management
  • Task organization
  • Calendaring
  • File attachment storage
SumatraPDF
SumatraPDF Features
  • Lightweight and fast PDF reader
  • Supports many document formats like PDF, ePub, MOBI, XPS, DjVu, CHM, CBZ, CBR
  • Customizable with themes, keyboard shortcuts
  • Tabbed document interface
  • Supports annotations and highlighting
  • Continuous scrolling
  • Supports reflowable text
  • Supports digital signatures
  • Supports comics book formats
  • Supports eBooks
  • Supports syncing open documents across devices

Pros & Cons Analysis

Open Contacts
Open Contacts

Pros

  • Open source
  • Customizable
  • Integrates with various tools
  • Free to use

Cons

  • May have a steeper learning curve compared to commercial CRM solutions
  • Limited support and community compared to larger commercial products
  • May lack some advanced features found in enterprise-level CRM systems
SumatraPDF
SumatraPDF

Pros

  • Lightweight and fast
  • Supports many document formats
  • Free and open source
  • Customizable
  • Good support for comics and eBooks

Cons

  • Limited annotation features compared to advanced PDF editors
  • Lacks OCR capabilities
  • No cloud storage integration
  • No mobile apps

Pricing Comparison

Open Contacts
Open Contacts
  • Open Source
SumatraPDF
SumatraPDF
  • Open Source

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Learn More About Each Product

Open Contacts
Open Contacts
Reviews, pricing & alternatives →
SumatraPDF
SumatraPDF
Reviews, pricing & alternatives →

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