Pajek

At a glance

• Editor score
  7.2 / 10
• Pricing
  Free plan
• Best for
  Large-scale academic network analysis
• Free plan
  Yes
• Paid from
  Free
• Founded
  1996
• Facts checked
  24 Sep 2026

• Where it wins

  • Handles networks with thousands to millions of nodes
  • Supports directed, undirected, mixed, bimodal and temporal networks
  • Includes clustering, block-modeling and large-network visualization

• Where it doesn't

  • Free availability is limited to non-commercial use
  • Platform and integration details are limited
  • Desktop focus may not suit teams seeking broader ecosystem connectivity

Our verdict on Pajek

Pajek is desktop software for analyzing and visualizing large networks, ranging from thousands to millions of nodes. Developed by Vladimir Batagelj and Andrej Mrvar at the University of Ljubljana, it fits academic researchers, students and solo analysts working with complex relationship data. The software supports directed, undirected and mixed networks, multiple relationship types, acyclic structures, bimodal networks and time-varying networks. Its free availability for non-commercial use makes it suitable for research and educational projects with focused analytical requirements.

Its main strength is the breadth of network-analysis methods available for large datasets. Pajek can decompose networks into clusters, apply block-modeling procedures and use visualization tools and algorithms designed for large networks. Those capabilities give analysts several ways to examine structure, relationships and change over time within one desktop application. Support for multiple network types also suits projects that move beyond a simple one-mode graph, including analyses involving two distinct node sets or changing relationships.

Pajek is a focused choice for users who value specialized network analysis over a broad software ecosystem. The published positioning identifies it as free, with non-commercial use specified, while platform and integration details are limited. That makes it a practical fit for academic and other non-commercial work where advanced graph methods matter more than connected workflows. Commercial teams, or groups that need clearly documented integrations and wider platform coverage, should consider alternatives designed around those requirements. Choose Pajek when large-scale structural analysis, clustering, block-modeling and visualization are central to the project.

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Pajek pricing

Pajek fact sheet

Alternatives to Pajek

• GraphistryA graph investigation environment with interactive exploration, APIs, and deployment choice.8.9
• GephiFree network analysis with desktop and browser-based graph exploration.8.8
• LinkuriousA broad graph investigation toolkit, priced for teams with enterprise needs.8.7

See all Pajek alternatives →

Featured on iTechGuides

Pajek is listed in our Graph Visualization Tools Software directory. Add the badge to your site — it links back to this page.

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Reviewed by iTechGuides Editors · Editorial team · Updated Oct 2026

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Last updated 7 Oct 2026 · How we research and update