semdup

At a glance

• Editor score
  8.4 / 10
• Pricing
  Open source
• Best for
  Semantic duplicate detection with local inference
• Paid from
  Free
• Clone detection method
  Semantic
• Facts checked
  20 Sep 2026

• Where it wins

  • Finds semantic duplicates beyond token-level similarity
  • Supports local CPU or CUDA inference with ONNX
  • Automates repository scans through GitHub Actions

• Where it doesn't

  • Self-hosted installation adds deployment responsibility
  • Amazon Bedrock embeddings may incur separate AWS charges
  • Language support is limited to the listed programming languages

Our verdict on semdup

semdup is an open-source command-line tool for identifying near-duplicate source code by comparing semantic meaning rather than token sequences. It indexes functions or code blocks, stores embeddings locally, and reports duplicate clusters across repositories. Developers can configure similarity thresholds and minimum cluster sizes, view source snippets, and use repository diff mode for pull-request review. It supports Rust, TypeScript, Python, Go, Java, C#, PHP, Ruby, C, and C++.

The deployment model is self-hosted and installed locally, which suits teams that want code analysis to remain within their own environment. Local ONNX inference can run on CPU or CUDA, while an optional Amazon Bedrock embedding backend provides another processing path. Bedrock usage may incur separate AWS charges, so teams choosing that backend should account for infrastructure costs beyond the open-source software itself. The local option is the clearer fit for users prioritizing control over where embeddings are generated and stored.

For repository workflows, semdup includes a GitHub Actions workflow and action, making automated scans and pull-request-oriented review part of its supported setup. Its semantic approach is useful when copied code has been renamed, reorganized, or changed beyond straightforward token similarity. The trade-off is focus: this is a self-hosted, command-line tool centered on repository-level duplicate detection rather than a broader hosted code-quality platform. Choose semdup when semantic matching, configurable clustering, local inference, and CI integration are priorities; consider an alternative if you need a hosted service or coverage beyond its supported languages.

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semdup pricing

semdup fact sheet

semdup integrations

semdup lists 2 integrations on its own site.

• GitHub Actions
• Amazon Bedrock

Alternatives to semdup

• jscpdA broad, self-hosted clone detector with strong CI, reporting, and history analysis.9.4
• art-duplA focused, self-hosted clone analyzer for Go teams building duplication checks into CI.9.2
• PPMDA strong open-source choice for teams pairing clone detection with broad static analysis.9.0

See all semdup alternatives →

semdup vs the competition

• Ssemdup vs jscpd
• Ssemdup vs art-dupl
• SPsemdup vs PMD
• SNsemdup vs NiCad
• SAsemdup vs Amimica
• S@Ssemdup vs @kongyo2/similarity-ts

Compare semdup with any tool side by side →

Featured on iTechGuides

semdup is listed in our Code Clone Detection Tools 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