No. 21 of 23 ·Code Clone Detection Tools

semdup

Windows · Mac · Linux · Self-hosted

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Freedom report

One barScore 5.1

Free tierNo free tier on record
Open codeNo open-source code on record
Runs widely3 of 6 device platforms
DocumentedThinly documented

semdup is ranked #21 of 23 in code clone detection tools on Freedom251. It runs on Linux, macOS, Self-hosted, Windows.

Compared on code clone detection tools

Clone detection method: semantic
Scan scope: repository
CI integration: Yes
Self-hosted option: Yes

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The record

Purpose: semdup is a fuzzy-search tool that detects near-duplicate code by comparing semantic meaning rather than token sequences.
Use case: The maker describes it as useful for catching AI-generated code duplication and preventing agents from reimplementing existing code.
Local inference: The default model runs locally on CPU or CUDA, and the maker says semdup keeps everything local unless an external backend is chosen.
Languages: The project lists Rust, TypeScript, Python, Go, Java, C#, PHP, Ruby, C, and C++ as supported languages, with a caveat that heavily macro-based C/C++ may perform less well.
Matching controls: Users can tune similarity thresholds, configure separate warning and error thresholds, and require matches to appear a chosen number of times.
Workflow integration: The project provides a GitHub Actions workflow and action that can run semdup checks on pull requests and pushes.
Bedrock integration: An optional Amazon Bedrock backend uses Titan Text Embeddings V2 through the AWS SDK credential chain and requires bedrock:InvokeModel permission.
Model choice: The default embedding model is nomic-ai/CodeRankEmbed, and users can configure a compatible model or use a Python sidecar for other backends.
Download integrity: The first initialization, refresh, or scan downloads the model into a user cache and verifies files against compiled BLAKE3 hashes before loading them.
Index limitation: Sparse search is approximate and can miss pairs found by exact search, while exact search compares every pair and avoids dropping matches.
Known limitation: The maker says the tool is still young, may contain bugs, and can produce false positives because it uses fuzzy search.
License: The project is available under either the MIT or Apache-2.0 license, at the user's option.
Maintainer support: The maker welcomes contributions to the project.

Where it ranks on Freedom251

Best Code Clone Detection Tools in 2026#21 of 23

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Sources

github.com/niklebedenko/semdup· checked 4 Oct 2026
github.com/niklebedenko/semdup/blob/main/docs/mode· checked 4 Oct 2026