Diffract

Diffract is a desktop and command-line tool for comparing code, folders, documents and binary files. It suits developers and other users who want local comparisons, with a capable free tier and a focused Pro upgrade. Its key trade-off is that merge, document and Git workflows require a per-seat license with a version ceiling.

Overview

Diffract combines side-by-side visual comparisons with a CLI for scripts, Git hooks and CI pipelines. The free tier handles unlimited file and directory diffs, so it can cover routine comparison work without a paid plan. Pro is for users who need three-way merges, document comparison or Git history tools rather than simply more basic diffs.

The maker says comparisons stay on the local machine and files never leave the computer. That is a useful fit for privacy-conscious workflows, though it does not replace an organization’s own security review.

For category browsing, see Diff and Merge Tools and File Comparison Software.

Key features

Code and text comparison

Syntax highlighting for more than 30 languages, word-level changes and moved-block detection give reviewers more context than a plain line-by-line diff. Collapsible unchanged regions help keep attention on edits in larger files. The CLI supports standard, Myers and patience algorithms, making it useful for repeatable comparisons in automation as well as manual review.

Folder and binary comparison

Recursive folder comparison identifies added, removed and modified files, with content-level drill-down for modified items. Hex and binary comparison is included in the free tier. This breadth makes Diffract practical for comparing whole directory trees, not just source files, though its strengths remain comparison-focused.

Pro merge, documents and Git

Pro’s three-way merge view separates local, remote and common-ancestor changes, addressing Git conflict resolution rather than only showing two versions. It also compares PDF, Word and Excel files; PDFs can be reviewed as highlighted pages or extracted text. Git history browsing, commit comparison and Git difftool use round out the upgrade for developers who want these tasks in one package.

OS context-menu integration supports opening comparisons from the desktop, while remote URL comparisons require Pro. Together, those integrations make the app easier to fit into existing workflows, but the free plan does not cover every route into a comparison.

Pricing

Diffract is freemium, with a free plan and a 7-day trial. Pro is a one-time purchase rather than a recurring subscription, but each license is per seat and covers versions only up to the version ceiling specified by its key.

The free tier can be used on any number of devices, including commercially, but redistribution is not permitted. Pro’s price buys a seat, not unlimited team coverage, and the version ceiling matters for buyers expecting access beyond the versions covered by their key. The terms allow a full refund request within 30 days of purchase through Paddle. The maker is not obligated to provide maintenance or technical support, though questions and bug reports can be sent by email.

Platforms

Diffract is a desktop product for Linux, macOS and Windows, with a CLI alongside the graphical app. That cross-platform coverage suits mixed desktop environments; it is not a web-based comparison service.

Who it's for

Choose Diffract if you want a local-first tool that can compare code, folders and binary files for free, especially if a CLI matters alongside the desktop interface. Pro makes sense when document diffs, three-way Git conflict resolution or Git history are regular needs. It is less suitable for teams that need multi-seat coverage in one purchase or ongoing support obligations from the maker.

Pros and cons

Pros

• Broad free comparison scope: Unlimited file and directory diffs plus binary comparison make the free plan useful beyond occasional code checks.
• Readable code diffs: Word-level changes, moved-block detection and collapsible unchanged regions help reviewers focus on meaningful edits.
• Desktop and CLI workflows: Three algorithms and CLI access support both interactive review and scripted comparisons.
• Local processing: The maker says files remain on the computer, an advantage when cloud transfer is undesirable.

Cons

• Advanced work requires Pro: Three-way merge, document comparison, semantic code comparison and Git history are paid features.
• Pro is per seat: Each user needs a license, which can increase the cost for teams.
• Version coverage is bounded: A key applies up to its stated version ceiling, so the one-time price does not promise coverage of every future version.
• Support is not guaranteed: The terms do not obligate the maker to provide maintenance or technical support.

Alternatives

• Diffchecker is worth considering if you want Linux, macOS, Windows and web access; its free plan limits some features by monthly try counts, while Pro + Desktop is $15 a month.
• delta is a free, MIT-licensed option for users who want a command-line tool installed through a package manager or executable download.
• SourceGear DiffMerge is another free choice across Linux, macOS and Windows.
• Meld suits readers seeking a free GPLv2-or-later tool for Linux or Windows.
• Code Compare is an option for Windows users who prefer an extension-based product, with free and paid Pro editions.
• WinMerge is a free, open-source alternative for Windows.
• mergers is a free option for Linux, macOS and Windows.
• Beyond Compare is a paid cross-platform alternative with a $35, paid once Standard Edition Per-User license and a free trial.

Verdict

Diffract is a strong choice for people who want capable local file and folder comparisons across Linux, macOS or Windows without paying for everyday use. Its free CLI and broad diff coverage are the main reasons to start here; choose Pro when merges, document diffs or Git history justify a per-seat purchase. Look elsewhere if you need guaranteed support, a license without a version ceiling, or a free tier that includes the advanced workflows.