CloneWorks

CloneWorks is a self-hosted tool for preparing source code and finding token-based clones in repositories. It suits developers comfortable with command-line dependencies who need control over fragment size and matching strictness. Its configurable detection is useful, but setup requirements and restrictive redistribution terms make it a poor fit for turnkey or commercial redistribution.

Overview

CloneWorks prepares repository code as fragments before detecting clones. Its input builder supports Java, C, C++, C#, and Python, and its documented test run performs Type-3 detection. That combination is relevant when you want to examine similar code beyond exact copies, though support for other input languages is not established.

The detector accepts a minimum similarity threshold from 0.0 to 1.0. This offers direct control over how closely fragments must match, but choosing a useful threshold requires judgment about what duplication matters in your codebase.

Key features

Extraction controls

Block, function, and file granularity let users set the scale of extracted code to suit their review. This is a practical strength for projects where duplication at different structural levels matters; users seeking a broader language range should look elsewhere.

Large-input handling

Partitioned partial-index mode is available when the index exceeds available memory. It provides an option for memory-constrained runs, but the partition size must be determined experimentally, adding tuning work rather than offering a fixed setting.

Requirements and support

CloneWorks requires FreeTXL 10.6 or later, gcc, make, and Java 7 or later. Those dependencies make it better suited to technically equipped users than teams seeking a turnkey application. On Windows, the input builder runs more slowly under Cygwin because process creation is slower. Jeffrey Svajlenko invites questions and bug reports by email and offers help with using the tool.

Pricing

CloneWorks is free: the CloneWorks plan costs nothing. Use requires acknowledgement, and no charge may be made. Copying, modification, and redistribution are permitted only if CloneWorks and derivatives remain under the license and are distributed without charge. That is a meaningful constraint for anyone planning to bundle or sell a derivative. The license provides the software as-is without warranty, including implied warranties of merchantability or fitness for a particular purpose.

Platforms

CloneWorks supports Linux, macOS, and Windows. The Cygwin performance limitation makes Windows a less attractive option when input-building speed matters.

Who it's for

CloneWorks is a sensible choice for developers or researchers who can meet its prerequisites and want to tune extraction granularity and similarity for repository-level clone detection. It is less suitable for users who need a turnkey setup, input languages beyond its stated set, or redistribution that permits charging for the software or derivatives.

Pros and cons

• Pros: Block, function, and file extraction plus a 0.0-to-1.0 similarity threshold give users control over what gets compared and how strictly.
• Pros: Partitioned partial-index mode offers a way to handle indexes larger than available memory.
• Cons: FreeTXL, gcc, make, and Java prerequisites raise the setup burden.
• Cons: Experimental partition sizing and slower input building on Cygwin can require extra patience and tuning.
• Cons: The no-charge redistribution condition rules out charging for CloneWorks or its derivatives.

Alternatives

Code Clone Detection Tools is a useful starting point for comparing options. Consider Algo VPN if you need self-hosted VPN setup scripts instead; its cloud infrastructure costs are separate. Duplo is another free option for Linux, macOS, and Windows, with prebuilt binaries for Alpine Linux, macOS, and Windows under GNU GPL v2 or later. Choose PMD if a downloadable static code analyzer under a BSD-style license better suits your needs. dcd is a free Linux and macOS option under AGPL-3.0, with a separate Priority support plan offering direct email support at custom pricing. jscpd is another free option for Linux, macOS, Windows, API, and self-hosted use. NiCad may suit users who can meet its OpenTxl 11 or later requirement; it is free and MIT-licensed. Simian Similarity Analyzer is a free open-source option under Apache License 2.0. CopyPaste is a free, open-source option for macOS and Windows with no premium tiers, subscriptions, or paywalls.

Verdict

Choose CloneWorks if you want repository clone detection with adjustable extraction and similarity settings, and can handle its dependencies and licensing conditions. Look elsewhere if you need a simpler setup or the freedom to charge for redistribution.