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DiffiCat

difficat.com

From $24.17/mo Free plan WebWindowsmacOSLinuxAPI
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Spec score 9.2 #3 of 34 in Browser Testing Software

What it is

DiffiCat compares source and target websites to check page existence, content accuracy, and visual changes during migrations. It checks HTTP status codes, broken redirects, authentication walls, and server errors. Content comparisons cover titles, headings, meta descriptions, and body text, using a 90% word-overlap threshold. For visual regression, it captures full-page screenshots and compares pixels with a configurable threshold that defaults to 0%. Viewport widths can be set to 375px, 768px, or 1440px, or customized from 320px to 2560px. A run can cover up to 10,000 pages; leaving the page limit blank removes the cap on discovered pages. DiffiCat can render JavaScript-driven pages, use HTTP basic authentication for both sites, and capture one or multiple URLs without a second site. Exports are ZIP files containing a plain-text report and PNG screenshots. The desktop app keeps outputs on the user's disk and uploads no URLs or screenshots; browser storage lasts for the browser session. The Free plan costs nothing. Desktop use has no limits for personal use; browser limits apply, and commercial use requires a license.

Spec sheet

What it does
DiffiCat compares old and new websites for missing pages, content changes and visual regressions during migrations.Read 15 Oct 2026 · difficat.com
Purpose
DiffiCat compares source and target websites for page existence, content accuracy, and visual regression during migrations.Read 1 Oct 2026 · difficat.com
Analytics
The website and browser app load Google Analytics 4 and use cookies for usage measurement.Read 15 Oct 2026 · difficat.com
API charge limitation
Settled charges are final; cancellation, failed jobs or partial results do not reduce the charge.Read 15 Oct 2026 · difficat.com
API documentation
The linked OpenAPI document provides routes, schemas, examples and live x-payment-info pricing.Read 15 Oct 2026 · difficat.com
API execution limits
A job can name at most 20 hosts and three jobs may run concurrently per caller.Read 15 Oct 2026 · difficat.com
API free allowance
Unauthenticated clients receive a daily allowance of 10 comparison pages, three discoveries and three screenshots per client address.Read 15 Oct 2026 · difficat.com
API payment
Paid API calls use HTTP 402 payment challenges and can be settled with USDC on Base or prepaid keys.Read 15 Oct 2026 · difficat.com
Authentication
HTTP Basic Authentication credentials can be entered separately for source and target sites and persist for the run.Read 15 Oct 2026 · difficat.com
Browser data storage
Browser comparisons are fetched by DiffiCat servers and reports and screenshots are stored in Google Cloud Storage for the session.Read 15 Oct 2026 · difficat.com
Browser limits
The browser trial allows up to 100 pairs per run, while the overall run ceiling is 10,000 pairs.Read 15 Oct 2026 · difficat.com
Browser storage
The browser version stores reports and screenshots in Google Cloud Storage for the duration of the browser session.Read 1 Oct 2026 · difficat.com
Commercial licensing
The Pro subscription supplies the commercial license, while free browser and desktop use is described as personal use.Read 15 Oct 2026 · difficat.com
Content checks
It compares titles, headings, meta descriptions, and body text using a 90% word-overlap threshold.Read 1 Oct 2026 · difficat.com
Content comparison
It compares page titles, headings, meta descriptions and body text using a 90% word-overlap threshold with word-level differences.Read 15 Oct 2026 · difficat.com
Credentials handling
Desktop credentials remain local, while browser credentials are used during fetching and are not stored with reports.Read 15 Oct 2026 · difficat.com
Desktop application
Native downloads are provided for macOS, Windows 64-bit and Linux x64 AppImage.Read 15 Oct 2026 · difficat.com
Desktop privacy
The desktop app reports no telemetry or analytics, uploads no URLs or reports, and keeps output on the local disk.Read 15 Oct 2026 · difficat.com
Downloads
The latest release provides 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.Read 1 Oct 2026 · difficat.com
Existence check
It compares HTTP status responses, detecting 404s, broken redirects, authentication walls, redirect loops and server errors.Read 15 Oct 2026 · difficat.com
Existence checks
It checks HTTP status codes, broken redirects, authentication walls, and server errors.Read 1 Oct 2026 · difficat.com
Export
Exports are ZIP files containing report.txt plus captured PNG screenshots.Read 15 Oct 2026 · difficat.com
JavaScript apps
The product uses Playwright to render JavaScript-driven pages before extracting content and screenshots.Read 15 Oct 2026 · difficat.com
Maker identity
The product identifies itself publicly as DiffiCat; no legal company name, headquarters or founding year is stated on the opened maker pages.Read 15 Oct 2026 · difficat.com
MCP integration
A stateless Streamable HTTP MCP endpoint is available at https://app.difficat.com/mcp with named comparison and reporting tools.Read 15 Oct 2026 · difficat.com
Network restriction
Requests to localhost, loopback, and private-network addresses are refused.Read 1 Oct 2026 · difficat.com
Page capacity
A comparison can cover up to 10,000 pages per run, with a blank page limit applying no limit to discovered pages.Read 1 Oct 2026 · difficat.com
Page discovery
Discovery tries a supplied sitemap, source sitemap, robots.txt sitemap, remapped target sitemap and homepage crawling in that order.Read 15 Oct 2026 · difficat.com
Private-network limitation
The browser service refuses localhost, loopback and private IP ranges, so internal sites need a public staging URL.Read 15 Oct 2026 · difficat.com
Release security
Desktop releases are code-signed, macOS-notarized and accompanied by SHA-256 checksums and GPG signatures.Read 15 Oct 2026 · difficat.com
Responsive testing
Captures support preset widths of 375, 768 and 1440 pixels plus custom widths from 320 to 2560 pixels.Read 15 Oct 2026 · difficat.com
REST API
The Agent API exposes discovery, screenshots, comparison jobs, reports, status, cancellation and recovery routes.Read 15 Oct 2026 · difficat.com
Screenshot mode
A single site can be captured without supplying a second site, allowing before-shot archiving.Read 15 Oct 2026 · difficat.com
SPA support
It uses Playwright to render JavaScript-driven pages before extracting content and capturing screenshots.Read 1 Oct 2026 · difficat.com
Support channel
The site provides an in-product feedback form covering errors, missing features, pricing, payments and documentation.Read 15 Oct 2026 · difficat.com
Version
The download page identifies desktop release v3.15.9 and copyright year 2026.Read 15 Oct 2026 · difficat.com
Visual regression
It captures pages and compares screenshots pixel by pixel with a configurable sensitivity threshold that defaults to zero percent.Read 15 Oct 2026 · difficat.com

Plans and prices

Free Free Free for Personal Use Desktop app has no usage limits · Browser: 500 comparison runs/hour · 200 page discoveries/hour · 2,000 pages/day · Commercial use requires a license Read 1 Oct 2026 · difficat.com
Free trial Free one-time allowance 100 captured pages without sign-in or 500 when signed in · up to 100 pairs per run · all checks and viewport widths Read 15 Oct 2026 · difficat.com
Agent API comparison $0.02, paid once per page for first 1,000 pages; $0.01/page thereafter POST /api/v1/jobs · no subscription or minimum · status/report reads free Read 15 Oct 2026 · difficat.com
Agent API screenshot $0.02, paid once per call in USDC on Base POST /api/v1/screenshots · full-page screenshot of one URL Read 15 Oct 2026 · difficat.com
Agent API discovery $0.05, paid once per call in USDC on Base POST /api/v1/discover · page discovery Read 15 Oct 2026 · difficat.com
Pro $29 a month monthly 5,000 captured pages/month shared by web app and Agent API · overage $0.01/page under $50 default cap · up to 10,000 pairs/run · commercial license Read 15 Oct 2026 · difficat.com
Pro annual $290 a year annual (save $58) 5,000 captured pages/month shared by web app and Agent API · overage $0.01/page under $50 default cap · up to 10,000 pairs/run · commercial license Read 15 Oct 2026 · difficat.com

Every DiffiCat plan and price →

Strong points and limits

Strong points

  • Checks page status, redirects, authentication walls, and server errors
  • Compares page text with a 90% word-overlap threshold
  • Captures full-page screenshots for pixel comparisons
  • Runs can cover up to 10,000 pages
  • Desktop app keeps outputs on disk without telemetry

Limits

  • Commercial use requires a license
  • Browser use has hourly and daily limits
  • Browser stores reports and screenshots in Google Cloud Storage
  • Requests to private-network addresses are refused

Who it suits

DiffiCat suits teams checking sites during migrations, including those needing content, availability, and visual comparisons across desktop, mobile, or tablet viewports. Personal users can use the desktop app without usage limits; commercial use requires a license.

Verdict

DiffiCat specifies its migration checks, page capacity, viewport options, and export contents. The free plan has distinct desktop and browser limits, and commercial use requires a license.

Where Specifiction places it

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