Overview

Diffract combines a visual comparison app with command-line tools, so it can fit both individual reviews and repeatable checks in scripts, Git hooks or CI pipelines. Its free edition covers unlimited file and directory diffs, including commercial use, and comparisons run locally according to the maker. That makes it a capable starting point without sending files off-machine.

The important trade-off is Pro’s seat-based license and version ceiling: a purchase covers versions only up to the ceiling specified by its key. Teams should account for that limit alongside the terms, which do not obligate the maker to provide maintenance or technical support.

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 make Diffract more useful than a bare line-by-line view when edits are dense. Collapsible unchanged regions help keep attention on what changed. These capabilities make the free edition practical for everyday source review.

Folder and binary comparison

Recursive directory comparison identifies added, removed and modified files, with content-level drill-down for modified files. Hex and binary comparison is also included in Free, giving users a way to inspect non-text changes without upgrading.

CLI, merge and Git

The CLI offers standard, Myers and patience algorithms for scripts, hooks and CI pipelines. That breadth is useful when teams want to select a diff strategy in automation rather than rely on the desktop interface alone. Pro adds three-way Git conflict resolution with local, remote and common-ancestor views, plus commit history browsing, commit comparison and Git difftool use from the UI or CLI.

Document comparison

Pro compares PDF, Word and Excel files. PDFs can be reviewed with changes highlighted on the page or as extracted text, a useful distinction for readers who need either visual layout context or textual detail. Remote URL comparison is also reserved for Pro.

Pricing

Diffract has a free tier and a 7-day trial. Free costs 0.00 USD per free, billed $0 forever. It includes unlimited file and directory diffs, the CLI and desktop app, syntax highlighting for 30+ languages, three diff algorithms, and hex/binary comparison. The tier may be used on any number of devices, including commercially, but redistribution is not permitted.

Pro costs 34.00 USD per once, billed as a one-time purchase per seat. It adds three-way merge, PDF, Excel and Word comparison, semantic code comparison, Git integration and history browsing, and all v1.x updates. The license key specifies both seat count and a version ceiling, so this is not an unrestricted promise of future versions. A full refund may be requested within 30 days of purchase through Paddle.

Free is the stronger fit for users who need ordinary file, folder or scripted diffs; it gives up document comparison, merge, Git history and remote URL comparisons. Pro makes sense when those workflows justify a per-seat purchase. The maker invites questions and bug reports by email, but its terms do not require maintenance or technical support.

Platforms

Diffract is a desktop application for Linux, macOS and Windows. The OS context-menu integration and Git difftool use connect it to desktop and developer workflows; the CLI extends it to scripts and CI.

Who it's for

Diffract is a strong fit for developers who compare local source trees, need a GUI alongside CLI automation, or want one desktop tool for code and document diffs. Its free commercial-use tier can suit individual users and teams starting with basic comparisons. Teams that need guaranteed support or a license without a version ceiling should weigh those terms before standardizing on Pro.

Pros and cons

Pros

Substantial free tier: unlimited file and directory diffs, CLI access and binary comparison are included without a device cap.
Useful source-review detail: word-level changes, moved-block detection and syntax highlighting help surface meaningful edits.
Automation and desktop in one package: three algorithms, Git hooks and CI support complement the visual app.
Focused Pro additions: document comparison, three-way merge and Git history cover workflows that basic diff tools leave aside.

Cons

Pro is per seat: team cost scales with licensed seats despite the one-time billing model.
Version ceiling: the key covers only versions up to its specified limit, which constrains upgrade expectations.
No required support commitment: the terms do not obligate maintenance or technical support.
Advanced workflows require payment: merge, document comparison, Git history and remote URL comparisons are not part of Free.

Alternatives

Diffchecker is a freemium option across Linux, macOS, web and Windows; choose it if web access matters, while noting its free tier has monthly try-count limits and Pro + Desktop costs 15.00 USD per month.

Code Compare is a freemium Windows option with an extension; consider it when that platform and extension form suit your stack.

delta is free and MIT-licensed for Linux, macOS and Windows; choose it if an open-source tool is the priority.

Difftastic is a free, MIT-licensed option for Linux, macOS and Windows.

Meld is free under GPLv2 or later for Linux and Windows; it is an alternative for teams on those platforms.

SourceGear DiffMerge is free to use across Linux, macOS and Windows.

WinMerge is a free, open-source choice for Windows users.

mergers is a free option for Linux, macOS and Windows.

Verdict

Diffract is a strong choice for developers who want local file and folder comparison, a capable free CLI, and an optional route to document, Git and merge workflows. The main reason to choose it is the breadth of useful comparison in Free; the main reason to look elsewhere is Pro’s per-seat version ceiling and lack of guaranteed support, especially for teams that need predictable long-term coverage.

	Diffract	Kaleidoscope
Free plan	Yes	No
Free trial	Yes	Yes
Paid from	Free	$0.67/mo
Open source	No	No
Platforms	Linux, macOS, Windows	macOS
Free plan	Yes	No
Three-way merge	Yes	Yes
Folder comparison	Yes	Yes
Paid from	—	8 /user/mo

Diffract vs Kaleidoscope

Diffract

Kaleidoscope