WebDiff
WebDiff is a desktop app that compares a website before and after an update to instantly spot any unwanted visual, SEO, code, or network changes.
A startup from Italia.
WebDiff is a desktop app that compares a website before and after an update to instantly spot any unwanted visual, SEO, code, or network changes.
A startup from Italia.
This page is designed to help you find out whether WebDiff is good and if it is the right choice for you.
WebDiff is a desktop application for macOS and Windows that lets you compare two versions of a website - for example, before and after a CMS, theme or plugin update - to instantly spot any unwanted change. It was built by TangoDev, an Italian software agency, out of a very concrete need: making the process of updating client websites safer and faster.
Every comparison runs 100% locally on your computer: no data is sent to third-party servers, and WebDiff works with websites on localhost, behind a VPN, on a local network, or protected by HTTP authentication.
For each pair of web pages, WebDiff generates a report covering:
Pages can be added manually or imported directly from a sitemap (up to 1,000 URLs at once). Reports use color-coded traffic lights to highlight issues at a glance, and can be exported as PDF or ZIP to share with clients or teammates. A "Continuous analysis" feature turns the latest comparison into a new baseline, making it easy to monitor a website over time (e.g. week after week).
WebDiff is sold as a one-time purchase, with no subscription: unlimited websites, unlimited comparisons.
Listed in
Visual Comparison
Pixel-level comparison of every page on desktop and mobile, with differences highlighted in red.
SEO Comparison
Checks title, meta description, canonical, H1 and other key SEO tags between the two versions.
Links Comparison
Compares all internal and external links to spot missing, added or changed links.
Source Code Comparison
Side-by-side diff of the HTML source code, with options to ignore comments and specific lines.
Network Requests Comparison
Detects added, removed or changed network requests, such as scripts, styles and third-party calls.
Sitemap Import
Import up to 1,000 pages from a sitemap, without entering URLs manually.
Before/After and Environment Comparison
Compare the same site before and after an update, or staging vs production vs localhost.
Local, VPN and HTTP Auth Support
Works with localhost, private networks, VPNs and password-protected sites.
Traffic-Light Report
See at a glance which pages changed, with a color-coded result for each comparison.
PDF and ZIP Export
Export reports to share with clients as proof of a safe update.
Continuous Analysis
Turn the latest analysis into the new baseline to monitor a site over time.
Smart Noise Filtering
Hide cookie banners, fixed headers and videos, and ignore selected elements, links or requests.
Parallel Analysis
Analyzes up to 10 pages at the same time for faster comparisons.
100% local and private
All analysis runs on your computer. No data is sent to external servers.
WebDiff checks a website on five layers in a single report: visual (desktop and mobile), SEO, links, source code and network requests. Most tools look at screenshots only. WebDiff also catches a changed title or H1, a broken link or a missing script, even when the page looks the same.
It is also a desktop app that runs entirely on your computer:
Tools like Percy, Applitools or Chromatic are built for development teams with automated test pipelines. WebDiff is built for people who update and maintain websites day to day and need a fast, reliable check without writing tests.
WebDiff is also used by SEO specialists (to make sure updates don't affect titles, meta tags, H1s and links), QA testers, and developers during site migrations (to compare the old and new site).
WebDiff was born at TangoDev, a small software agency in Italy, out of a problem we faced every week. You update a client's WordPress site, with core, plugins and theme, check a few pages, and everything looks fine. An hour later the client calls: some buttons have disappeared and the contact form no longer works.
Checking every page by hand with screenshots was slow and unreliable, so we built a tool for ourselves that compares the site before and after the update and shows exactly what changed. It worked so well that we released it publicly in December 2024. Since then, many releases have been shaped directly by user feedback, from the AppSumo community to Product Hunt.
WebDiff is used by hundreds of freelancers and web agencies around the world, many of whom joined through our AppSumo campaign. They range from solo developers maintaining a handful of client sites to agencies updating dozens of websites every month.
WebDiff is a cross-platform desktop app for macOS and Windows, built with modern web technologies. At its core is a proprietary analysis engine we built in-house to maximize reliability and performance: it loads each page in a real browser environment, captures visual snapshots (desktop and mobile), source code, SEO data, links and network requests, then compares the two versions and highlights every difference.
Everything runs locally on your computer: no cloud processing, no external servers.
We have collected here some useful links to help you find out if WebDiff is good.
Check the traffic stats of WebDiff on SimilarWeb. The key metrics to look for are: monthly visits, average visit duration, pages per visit, and traffic by country. Moreoever, check the traffic sources. For example "Direct" traffic is a good sign.
Check the "Domain Rating" of WebDiff on Ahrefs. The domain rating is a measure of the strength of a website's backlink profile on a scale from 0 to 100. It shows the strength of WebDiff's backlink profile compared to the other websites. In most cases a domain rating of 60+ is considered good and 70+ is considered very good.
Check the "Domain Authority" of WebDiff on MOZ. A website's domain authority (DA) is a search engine ranking score that predicts how well a website will rank on search engine result pages (SERPs). It is based on a 100-point logarithmic scale, with higher scores corresponding to a greater likelihood of ranking. This is another useful metric to check if a website is good.
The latest comments about WebDiff on Reddit. This can help you find out how popualr the product is and what people think about it.
Do you know an article comparing WebDiff to other products?
Suggest a link to a post with product alternatives.
Is WebDiff good? This is an informative page that will help you find out. Moreover, you can review and discuss WebDiff here. The primary details have been verified within the last quarter. So they could be considered up to date. If you think we are missing something, please use the means on this page to comment or suggest changes. All reviews and comments are highly encouranged and appreciated as they help everyone in the community to make an informed choice. Please always be kind and objective when evaluating a product and sharing your opinion.
