JPlag vs NiCad

JPlag6.7Visit NNiCad6.5Visit

Higher score JPlag #6 in Code Duplication Detection Tools 6.7/10 Free plan Free plan✓ 2 of 4 features Visit JPlag

vs

N NiCad #8 in Code Duplication Detection Tools 6.5/10 Free plan Free plan✓ 1 of 4 features Visit NiCad

• JPlag fits best

  Academic or multi-language similarity analysis

• NiCad fits best

  Researchers needing configurable clone analysis

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Side by side

Feature	JPlag 6.7/10 Visit ↗	NNiCad 6.5/10 Visit ↗
At a glance
Editor score	6.7	6.5
Ranking	#6 in Code Duplication Detection Tools	#8 in Code Duplication Detection Tools
Best for	Academic or multi-language similarity analysis	Researchers needing configurable clone analysis
Pricing model	Free	Free
Starting price	Free plan	Free plan
Free plan	✓	✓
Free trial	—	—
Deployment	Self-hosted	Self-hosted
Platforms	Windows, macOS, Linux	Windows, macOS, Linux
Built for	Small business, Mid-market, Enterprise	Solo, Small business, Mid-market
Features JPlag 2/4 · NiCad 1/4
Near-duplicate detection	✓ (best)	Not checked yet
Duplication gates	—	Not checked yet
Trend visualisation	—	Not checked yet
Open-source option	✓	✓
Specs
Supported languages	20	Not checked yet
CI/PR reporting	None	Not checked yet
Our review
Pros	Syntax-aware matching across 20 supported languages Handles some obfuscation and code modifications Free, open source, with CLI and Java API access	Finds exact and near-miss clones with configurable similarity thresholds Supports normalization, renaming, filtering, and abstraction Reports clone pairs and classes in XML or browsable HTML
Cons	Focused on pairwise analysis rather than duplication gates No CI pull-request reporting or trend visualisation Self-hosted setup relies on community support	Command-line and self-hosted use may require technical setup Language availability varies by version and distribution No verified integrations are specified
Our verdict	JPlag is a free, open-source tool that compares programs pairwise to identify source-code similarity. It is primarily suited to programming education, where instructors review student submissions, and it can also help examine duplicated… Read the review →	NiCad is a free, open-source command-line tool for detecting exact and near-miss code clones in software systems. It is aimed at researchers and developers who want to configure how source fragments are extracted, normalized, and compared,… Read the review →

Strengths and trade-offs

• JPlag — where it wins

  • Syntax-aware matching across 20 supported languages
  • Handles some obfuscation and code modifications
  • Free, open source, with CLI and Java API access

  Where it doesn't

  • Focused on pairwise analysis rather than duplication gates
  • No CI pull-request reporting or trend visualisation
  • Self-hosted setup relies on community support

• NiCad — where it wins

  • Finds exact and near-miss clones with configurable similarity thresholds
  • Supports normalization, renaming, filtering, and abstraction
  • Reports clone pairs and classes in XML or browsable HTML

  Where it doesn't

  • Command-line and self-hosted use may require technical setup
  • Language availability varies by version and distribution
  • No verified integrations are specified

• JPlag6.7/10 · Free plan

  A free, syntax-aware tool for pairwise program-similarity analysis across 20 languages.

  Visit JPlagFull verdict →
• NNiCad6.5/10 · Free plan

  A configurable command-line tool for finding exact and near-miss code clones.

  Visit NiCadFull verdict →