For developers, freelancers and web agencies

Update your sites without fear of breaking something.

WebDiff captures your pages before and after the update and flags every difference: visual, SEO, links, code, network.

Missing buttons, broken forms, broken layouts: you catch them in 2 minutes, not your client days later.

bolt View pricing and buy play_arrow Watch demo

desktop_mac MacOS

desktop_windows Windows

lock Runs locally, 100% private

Webdiff

5/5

On AppSumo

300+

Professionals

∞

Sites per license

0€

Subscription

THE PROBLEM

An update can break your site. And you find out too late.

A plugin update, a theme change, a quick edit: it doesn’t take much for something to break. Without a systematic comparison, your client finds the mistake first.

cancel A button or form disappears and no one notices for days

cancel Titles and meta tags change and SEO quietly suffers

cancel Manually checking every page after each update is slow and error-prone

That’s where WebDiff comes in.

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play_arrow Watch WebDiff in 90 Seconds

5 automatic comparisons. One report, readable at a glance.

You decide when to run the analysis. WebDiff compares pages across 5 fronts and flags every difference with color-coded status indicators.

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Pixel-perfect comparison

Not a single changed pixel goes unnoticed, on desktop and mobile.

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SEO parameters

Titles, meta tags, headings: verify SEO elements haven’t changed.

link

Internal and external links

Checks all links on the analyzed pages: no broken links.

code

Source code

Verifies the pages’ HTML structure hasn’t changed.

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Network requests

Identifies new scripts or resources loaded by the pages after the update.

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Export and share

Save every report as a PDF and send it to your client.

Three steps. Then sit back and relax.

01

Enter the URLs

Add pages manually or import a sitemap. Works with local sites, VPNs, local networks, or HTTP auth too.

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02

Run the analysis

You decide when to analyze. Get notified as soon as the report is ready. Re-run comparisons as many times as you like.

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03

Read the report

Status indicators highlight the main differences. Open the detail for every single change. Export to PDF.

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Not just before/after: compare different environments too.

Same app, two workflows. Pick the right one for your case.

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Before and after

Compare the same site at two different points in time: before and after an update, a migration, or a change.

site.com — before
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site.com — after
host

Different environments

Compare the same site across two environments: production vs staging, or production vs local. Handy before every deploy.

production
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staging / local

THE REPORT

Understand if something’s wrong at a glance.

Nothing to interpret: check the status indicators and know instantly where to look. Green, all good. Yellow, check it. Red, there’s a change.

  • circle Visual comparison 300 pixels changed
  • circle SEO no changes
  • circle Links 2 links changed
  • circle Source code no changes
  • circle Network requests 4 requests changed
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THE REPORT DETAIL

Open a page and see every comparison, point by point.

Clicking a page from the report home takes you to the detail view: every comparison performed, with differences highlighted in red/green.

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Visual

Both versions side by side, desktop and mobile. A third image highlights in red only the pixels that changed.

Before
After
Diff
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search

SEO

Title, description, canonical, H1 and other parameters compared.

title: "About us" title: "About us | Studio X"
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link

Links

All internal and external links from both versions, differences highlighted.

/services/old /services/new
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code

Source code

A text comparison of the HTML from both versions, line by line.

<div class="old"> <div class="new">
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sync_alt

Network requests

Requests made by both versions, to catch new scripts or resources.

+ tracker.js
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Built for people who manage client sites.

savings

Pay once, not every month

Lifetime license: no renewals, no surprise charges. 1.x updates included.

all_inclusive

Unlimited pages and sites

Compare as many pages as you like, across all your clients’ sites. No monthly limits.

dns

Works on localhost too

Local sites, behind a VPN, internal network, or HTTP auth: WebDiff can reach them.

encrypted

Your data never leaves your PC

The comparison runs 100% on your computer. No cloud, no third-party servers.

update

Updates itself

You always have the latest version without lifting a finger. New features coming from the roadmap.

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Real, human support

Behind it is TangoDev: we reply fast and your requests actually make it onto the roadmap.

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star 5/5 on AppSumo

Hundreds of professionals and agencies already use it.

star star star star star

Exceptional tool + phenomenal support!

WebDiff has quickly become an essential part of my workflow. I use it to track visual changes across multiple websites, ensuring nothing slips through the cracks during updates, content edits, or third-party plugin changes. The automated screenshots, side-by-side comparisons, and change detection alerts save me hours of manual QA and give me complete peace of mind.

What really sets WebDiff apart is the team behind it. I reached out with a feature request and not only did they respond almost immediately, but they also implemented the feature within a month! That level of responsiveness and commitment to user feedback is rare and incredibly appreciated.

It is consistently updated with new features every month, always evolving to meet the growing and demanding needs of its users. It’s clear the team is committed to building something exceptional and actively listens to feedback.

Huge kudos to the team – I couldn’t be more impressed! This is exactly the kind of product and support experience that deserves attention.

spadetje_17

spadetje_17

star star star star star

WebDiff Took the Stress Out of Website Updates

Before WebDiff, ensuring a website update didn’t break anything was a nightmare. I’d spend hours manually taking screenshots, hoping to catch visual regressions or hidden code changes. The results were often unreliable, and crucial differences would slip through, leading to painful post-update fixes. Now, with WebDiff, that stress is gone. Its easy-to-use interface, combined with the versatility to compare local dev environments against live sites, means I can thoroughly check everything. The comparison report is rich in information but simple to use; you just have to look at the traffic lights to see if something is wrong. The sitemap import feature is a lifesaver for large sites, and their support team was available when I had any questions. The documentation is also very comprehensive. WebDiff has truly transformed my update process, making it efficient, accurate, and worry-free.
marco687

marco687

star star star star star

Essential tool

Highly recommended tool. Simple to use and easy to configure. You can import sitemap.xml from an entire site 🙂 It visually marks changes to a page with a comparison. It also includes the code snippet. It’s constantly updated.
JavierPelayo

JavierPelayo

star star star star star

Helpful for site update comparisons

For anyone managing websites, the capability to easily capture how a site looks before and after making changes – be it deploying updates or tackling a migration – is a time-saver. It provides immediate visual feedback, helping to spot any subtle layout inconsistencies or style regressions right away. The interface is minimalistic and intuitive, letting you jump straight into comparisons. Plus, knowing that the support team is genuinely helpful and quick to respond if you hit a snag adds confidence. It’s a solid utility, and I appreciate the active development. The only thing I wish as of now that the speed of comparisons would improve.
NXP

NXP

star star star star star

Great tool if you work with Websites

I couldn’t be more happy with how well it works! This tool is great for anyone who needs to manage website updates. After updating a website, I often worry about missing critical changes but with WebDiff you can easily compare any web pages and spot unwanted changes.

This is one of those tools you didn’t realize you needed until you have it. Highly recommend adding this tool to your arsenal!

Fezziwig

Fezziwig

star star star star star

Very helpful app

I recently discovered the tool and thought it was a great idea. It’s so handy to be able to compare pages directly with each other. Whether after a migration or an update, this tool allows you to immediately detect differences. Contacting support is also great and I’m looking forward to future updates that will make the tool even more helpful.
TobiasM

TobiasM

star star star star star

A very useful little app

As someone who works with websites daily, having the ability to take snapshots of websites before and after working on them is very important, and WebDiff makes doing so a breeze.

The interface is very easy to use, and since purchasing this, I’ve been using it every day. If you are someone who works on websites, either doing design and development work or even SEO, this is a great tool to have in your kit.

Support were also very responsive when I had a question about some sites being blocked due to my location.

Alex.D

Alex.D

star star star star star

Simple and very effective tool for managing website updates

I earn a significant part of my income from managing WordPress websites for clients, both built my me or by others. Updating them can be stressful due to complex premium plugins that sometimes conflict. For instance, the famous Elementor warns users to back up before almost every update because conflicts may arise. Unfortunately, if an issue arises—like a coupon field disappearing on an e-commerce site after an update—you might not know until a customer complains days later, making your backup useless for recent orders. The best way to prevent this is by taking screenshots of key website screens to compare before and after updates, and that’s where WebDiff comes in. WebDiff allows you to add multiple, unlimited screens for each site, providing a thorough overview of critical parts during comparisons. While the app’s UI is functional, there is room for improvement (as is the case with most apps). However, the developers are highly responsive and quick to implement suggestions, I tested it myself. As a final plus, WebDiff stands apart from the typical offerings on AppSumo by being a locally-run application. This allows me to add unlimited websites and perform endless comparisons, making it both invaluable and affordable for users like me who manage multiple sites. For me, it’s a game-changer!
Enricofra

Enricofra

PRICING

One-time payment. No subscription, unlimited sites.

One license, yours forever, with all 1.x updates included.

Personal

For freelancers

119,00 $

one-time

  • check 1 seat
  • check No subscriptions
  • check Unlimited websites
  • check Secure payment
  • check Basic support
  • check Free updates to any 1.x version
bolt Buy now
Most popular

Duo

For small teams

209,00 $

one-time

  • check 2 seats
  • check No subscriptions
  • check Unlimited websites
  • check Secure payment
  • check Basic support
  • check Free updates to any 1.x version
bolt Buy now

Team

For teams and companies

469,00 $

one-time

  • check 5 seats
  • check No subscriptions
  • check Unlimited websites
  • check Secure payment
  • check Advanced support
  • check Free updates to any 1.x version
bolt Buy now

FAQ

Choose a plan and you’ll be redirected to secure checkout. Afterwards you’ll get an email with links to download the app.

No. It’s a one-time payment: the license is yours forever and includes all 1.x updates.

MacOS and Windows. The app runs locally on your computer.

Comparisons are run manually: you decide when to capture the “before” and the “after.” Scheduled, automatic comparisons are on the roadmap.

Yes, WebDiff performs visual comparisons on both desktop and mobile.

No problem: you can enter URLs manually, the sitemap is just a shortcut for bulk-importing large sites.

Reports are saved locally on your computer and never expire. No cloud, no expiration: they stay available as long as you keep them.

Yes. The license covers a number of seats based on your plan and can be moved from one computer to another: just uninstall it on the old one and install it on the new one.

Yes. The comparison happens 100% on your computer, without involving any third-party servers.

Yes: localhost, VPNs, local networks, and HTTP authentication. You can also import a sitemap for large sites.

WebDiff is built by TangoDev, an Italian software agency based in Cremona. We created it to solve a problem we faced every day, and now we offer it to freelancers and agencies.

Yes, of course! You can find our documentation here. It covers all the app’s features in detail. If anything isn’t clear, feel free to reach out: we’re happy to help!

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