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Locknote vs SumatraPDF

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

Locknote icon
Locknote
SumatraPDF icon
SumatraPDF

Locknote vs SumatraPDF: The Verdict

⚡ Summary:

Locknote: Locknote is a free, open-source, encrypted notebook app for Windows, Mac, Linux, iOS and Android. It allows securely storing notes, tasks, passwords and more behind a master password.

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 Locknote SumatraPDF
Sugggest Score — —
Category Security & Privacy Office & Productivity
Pricing Open Source Open Source

Product Overview

Locknote
Locknote

Description: Locknote is a free, open-source, encrypted notebook app for Windows, Mac, Linux, iOS and Android. It allows securely storing notes, tasks, passwords and more behind a master password.

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

Locknote
Locknote Features
  • Encrypted notes
  • Master password protection
  • Cross-platform availability
  • Note organization
  • To-do lists
  • Password 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

Locknote
Locknote
Pros
  • Free and open source
  • Strong encryption
  • Available on many platforms
  • Simple and easy to use
  • Syncs between devices
  • Active development
Cons
  • Limited features compared to paid options
  • No cloud sync (self-hosted only)
  • No collaboration tools
  • Basic interface
  • Lacks advanced organization
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

Locknote
Locknote
  • Open Source
SumatraPDF
SumatraPDF
  • Open Source

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Learn More About Each Product

Locknote
Locknote
Reviews, pricing & alternatives →
SumatraPDF
SumatraPDF
Reviews, pricing & alternatives →

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