Best Code Clone Detection Tools in 2026
Updated
In short: Duplo is ranked #1 of 23 as of 4 October 2026, ahead of PMD and CloneWorks. The best-ranked option with a free plan is PMD.
Code clone detection tools help you find repeated or closely related code for review. Compared on supported languages, scan scope, and clone detection method, the entries offer criteria for matching a tool to the code you work with. Duplo, PMD, and CloneWorks are among the named options. CI integration and IDE integration can help you assess how detection results may fit your workflow, while self-hosting, free-plan availability, and paid-from pricing address deployment and cost. Consider which languages and parts of a project you need to scan, then weigh those details against how your team prefers to review findings.
23 code clone detection tools ranked on what their makers publish — plans and prices, free tiers, platforms and the facts on their own pages.
7 of the 23 here have a free tier you can use, 0 have open-source code on record, and 0 have full bars: free, open, on most of your devices and documented.
| # | App | Signal | Free tier | Open code | Devices | From | Score |
|---|---|---|---|---|---|---|---|
| 1 | DuploWindows · Mac · Linux | Three bars | — | 3 of 6 | Free | 6.6 | |
| 2 | PMDWindows · Mac · Linux · Self-hosted | Three bars | — | 3 of 6 | Free | 6.6 | |
| 3 | CloneWorksWindows · Mac · Linux | Three bars | — | 3 of 6 | Free | 6.5 | |
| 4 | dcdMac · Linux | Two bars | — | 2 of 6 | Free | 6.5 | |
| 5 | jscpdWindows · Mac · Linux · Self-hosted · API | Three bars | — | 3 of 6 | Free | 6.5 | |
| 6 | NiCadWindows · Mac · Linux · Self-hosted | Three bars | — | 3 of 6 | Free | 6.5 | |
| 7 | Simian Similarity AnalyzerWindows · Mac · Linux | Three bars | — | 3 of 6 | Free | 6.5 | |
| 8 | Algo VPNWindows · Mac · Linux · Android · iPhone | Two bars | — | — | 5 of 6 | — | 5.6 |
| 9 | copydetectWindows · Mac · Linux · Self-hosted · API | Two bars | — | — | 3 of 6 | — | 5.6 |
| 10 | HoundWeb · Mac · Linux · Self-hosted · API | Two bars | — | — | 3 of 6 | — | 5.6 |
| 11 | QuickDupWindows · Mac · Linux | Two bars | — | — | 3 of 6 | — | 5.5 |
| 12 | CCFinderSWWindows | One bar | — | — | 1 of 6 | — | 5.4 |
| 13 | DeckardWindows · Mac · Linux | One bar | — | — | 3 of 6 | — | 5.4 |
| 14 | art-duplNo platforms listed | One bar | — | — | 0 of 6 | — | 5.3 |
| 15 | @kongyo2/similarity-tsNo platforms listed | No signal | — | — | 0 of 6 | — | 5.1 |
| 16 | AmimicaNo platforms listed | No signal | — | — | 0 of 6 | — | 5.1 |
| 17 | CopyPasteWindows · Mac | No signal | — | — | 2 of 6 | — | 5.1 |
| 18 | dskDittoMac · Linux | No signal | — | — | 2 of 6 | — | 5.1 |
| 19 | DUDE (DUplicates DEtector)Windows · Linux | No signal | — | — | 2 of 6 | — | 5.1 |
| 20 | phpcpd-nextNo platforms listed | No signal | — | — | 0 of 6 | — | 5.1 |
| 21 | semdupWindows · Mac · Linux · Self-hosted | One bar | — | — | 3 of 6 | — | 5.1 |
| 22 | SourcererCCLinux · Self-hosted | No signal | — | — | 1 of 6 | — | 5.0 |
| 23 | CodeMatchNo platforms listed | No signal | — | — | 0 of 6 | — | 4.7 |
Is your app on this list?
Numbered spots on this list can be sponsored. They are labelled, and the editorial order and scores never change for payment.
Questions about this list
Which code clone detection tool is ranked first on Freedom251?
Duplo is ranked #1 of 23 with a score of 6.6. PMD is second and CloneWorks third.
How many of these have a free plan?
7 of the 23 on this page publish a free plan on their own pricing pages.
How is this list ranked?
Ranked free-and-open first: a usable free tier and open-source code, then the platforms it runs on and its documentation. Paid placements never change a rank.