DiffiCat

Overview

DiffiCat is a website comparison tool for teams checking a migration or auditing pages for content and visual changes. It is strongest when a project needs large-scale page coverage alongside several kinds of checks in one run.

Its desktop app is the better fit for work that must keep outputs on the user’s disk. The browser option trades that control for session-based storage and defined usage limits.

Key features

DiffiCat checks HTTP status codes, broken redirects, authentication walls and server errors, then compares titles, headings, meta descriptions and body text at a 90% word-overlap threshold. Pairing availability checks with content comparisons helps catch both failed routes and meaningful copy drift; the overlap threshold gives teams a consistent bar for flagging differences.

Visual checks use full-page screenshots and pixel-by-pixel comparison. The threshold defaults to 0%, so even small changes can register; teams that want to filter minor pixel differences can configure it. Preset viewport widths are 375px, 768px and 1440px, with custom widths from 320px to 2560px. That range supports mobile, tablet and desktop checks without restricting a team to the presets.

A comparison can cover up to 10,000 pages per run, and a blank page limit means discovered pages are not capped. This is a substantial advantage for large migrations. Screenshot mode can also capture one or more URLs without a second site, which makes it useful for visual snapshots beyond source-to-target comparisons.

Playwright renders JavaScript-driven pages before content extraction and screenshot capture, making the checks applicable to single-page apps as well as pages served as static HTML. HTTP basic authentication is supported for both source and target sites. Requests to localhost, loopback and private-network addresses are refused, so DiffiCat is not suitable for checking those internal targets.

Exports are ZIP files containing a plain-text report and captured PNGs. The desktop app has no telemetry, uploads neither URLs nor screenshots, and keeps outputs on disk. The browser version stores reports and screenshots in Google Cloud Storage for the browser session, making it the less private choice for work involving sensitive URLs or captures.

Pricing

Free: free, billed Free for Personal Use. The desktop app has no usage limits; browser use allows 500 comparison runs per hour, 200 page discoveries per hour and 2,000 pages per day. Commercial use requires a license.

The no-limit desktop option suits personal projects with substantial page counts, while the browser plan’s quotas suit lighter or occasional checks. The free terms are explicitly for personal use, so businesses should account for the commercial license requirement rather than treating the desktop app’s lack of usage limits as a commercial entitlement.

Platforms

DiffiCat supports Linux, macOS, Windows and the web. Desktop downloads include macOS DMG files, a Windows 64-bit EXE installer and a Linux x64 AppImage. Releases include code signing, macOS notarization, SHA-256 checksums and GPG signatures.

Automated test execution is supported, with desktop, mobile and tablet device coverage through configurable viewport widths.

Who it's for

DiffiCat is a good fit for migration teams that need to check routes, content and appearance across many pages, especially when they want local desktop outputs or need JavaScript-rendered pages checked. It is also useful for personal audits and screenshot capture that does not require a second site.

It is a weaker fit for commercial users unwilling to obtain a license, teams that need browser-based checks beyond the stated quotas, or anyone whose target pages are on a private network.

Pros and cons

• Pros: One workflow checks page availability, content and visual differences, reducing the need to rely on screenshots alone.
• Pros: Up to 10,000 pages per run and no discovered-page cap when the page limit is blank suit broad migrations.
• Pros: The desktop app keeps URLs and outputs off uploaded storage, with no telemetry.
• Pros: Playwright rendering and basic authentication support cover JavaScript-driven and protected source or target sites.
• Cons: Browser use has hourly and daily quotas, unlike the desktop app’s stated lack of usage limits.
• Cons: Commercial use requires a license, so the free personal-use plan is not a business plan.
• Cons: Browser reports and screenshots go to Google Cloud Storage for the session, which may not suit sensitive work.
• Cons: Private-network and localhost targets are refused, and the default 0% visual threshold may flag small changes.

Alternatives

Browser Testing Software is the category directory for comparing browser-testing options.

Choose TestCafe instead if an open-source, MIT-licensed test runner is a better match; its framework plan is free.

CloudQA may suit teams prioritizing API testing: its free Kickstart plan includes unlimited API tests, local execution, seven days of test history and Chrome.

Choose Percy if a screenshot-focused service with published monthly screenshot allowances is a better fit: Desktop is $199 a month, billed annually, for 10,000 screenshots per month, while Desktop & Mobile is $599 a month, billed annually, for 25,000.

Browserling is another freemium option for readers comparing browser-testing products.

Happo is worth considering for a free visual and accessibility testing plan, which includes 5,000 snapshots per month, Chrome, and no credit card or time limit.

Mobitru is a paid alternative created by EPAM and developed by a team within EPAM.

Screenster has a free plan for readers comparing per-tester visual test capacity: it allows one concurrent test and one user, with 100 local or 50 cloud runs per user per month.

Selenium is a free, open-source browser automation tools and libraries option for readers who prefer that approach.

Verdict

Choose DiffiCat for personal migration work that needs broad page coverage, content and visual checks, and desktop outputs kept on disk. Its main draw is the combination of those checks with a 10,000-page run capacity; look elsewhere if commercial use without a separate license, private-network targets or browser-based work beyond the quotas is central to the job.