Instead of Duplo
Duplo alternatives
Duplo is a free source-code duplicate finder for large repositories, with built-in support for languages including C/C++, Java, C#, TypeScript and Swift. It can also scan arbitrary text files, filter comments and other syntax in supported languages, and return text, JSON or XML reports. Its GitHub Action can fail a build when duplicates cross configurable thresholds, and it runs on Linux, macOS and Windows.
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Algo VPN
by Algo VPNFree plan AndroidiPhoneLinux+3Free VPN access across common client platforms — Algo VPN provides VPN access and audit logs, while Duplo detects duplicate code across repositories.
Open source Visit site - 2
PMD
Free plan LinuxMacSelf-hosted+1Static analysis plus copy-paste detection — PMD adds 400+ static-analysis rules and build integrations alongside its CPD copy-paste detector.
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CloneWorks
Free plan LinuxMacWindowsConfigurable code-clone analysis granularity — CloneWorks supports block, function and file extraction, plus a similarity threshold for clone detection.
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dcd
Free plan LinuxMacNear-match detection with visual reports — dcd adds fuzzy matching, gap and hole tolerance, and interactive HTML visualizations to duplicate-code detection.
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jscpd
Free plan Open source APILinuxMac+2Broad language and clone-type coverage — jscpd supports 224 languages and opt-in renamed, near-miss and experimental semantic clone detection.
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NiCad
Free plan LinuxMacSelf-hosted+1Near-miss clones at multiple code levels — NiCad analyzes files, functions or blocks and offers configurable normalization before near-miss comparisons.
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Simian Similarity Analyzer
Free plan LinuxMacWindowsHuman-readable files beyond source code — Simian scans source, markup, stylesheets, Markdown and plain text, with XML, YAML and editor-friendly reports.
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CCFinderSW
Free plan Windows - 9
copydetect
Free plan APILinuxMac+2 - 10
CopyPaste
Free plan MacWindows - 11
Amimica
Free plan APISelf-hosted - 12
Deckard
Free plan APILinuxMac+2 - 13
Hound
Free plan APILinuxMac+2 - 14
phpcpd-next
Free plan APILinuxSelf-hosted - 15
CodeMatch
Free plan Windows6.8 Visit site - 16
dskDitto
Free plan LinuxMac - 17
DUDE (DUplicates DEtector)
Free plan LinuxWindows - 18
QuickDup
Free plan LinuxMacWindows - 19
@kongyo2/similarity-ts
Free plan - 20
SourcererCC
Free plan LinuxSelf-hosted - 21
art-dupl
Paid - 22
semdup
Paid LinuxMacSelf-hosted+1 - 23
Vendetect
Paid
A different tool may suit you if you need near-miss matching, more clone types, static checks beyond duplication, or a different analysis granularity. Duplo’s quick-start example uses a 20-line duplicate minimum, though command-line options can change it; the project is also provided without warranty. When switching, compare language coverage, exact versus similar-clone detection, report formats, build integration and platform requirements. Consider whether you want a focused duplicate finder or a broader analyzer, and check any runtime or setup dependencies against your workflow.