Short answer
Website change monitoring is software that watches URLs you choose, takes periodic snapshots, compares each capture to the last, and surfaces meaningful differences-headline copy, pricing tables, CTAs, layout blocks-not every trivial pixel shift.
Instead of bookmarking competitor pages and refreshing them manually, you get a timeline of evidence: what changed, when, and often a visual before/after you can share with product, marketing, or leadership.
How it works (in plain terms)
You add URLs - pricing pages, feature pages, changelogs, your own launch landings, or competitor hubs.
The system captures on a schedule - hourly, daily, or whatever cadence fits the page’s importance.
Each run is compared to the previous capture - text, structure, and visual layout are diffed.
High-signal changes land in a timeline - you review proof, not noise, when something worth acting on appears.
GetWhatChanged follows this model with monitors, scheduled runs, visual compare, and a change feed built for operators who need evidence, not alerts about footer copyright years.
What website change monitoring is not
Not uptime monitoring - knowing a site is “up” does not tell you the pricing hero changed overnight.
Not generic web scraping - raw HTML dumps without context are hard to review; good tools emphasize reviewable diffs.
Not a replacement for analytics - traffic tells you who visited; change monitoring tells you what the page said when they did.
Who uses it
Common teams and roles:
Product & growth - track competitor positioning, packaging, and feature claims.
Marketing - catch campaign page drift, pricing mismatches, and CTA experiments.
Founders & agencies - watch multiple client or competitor properties from one workspace.
RevOps & sales enablement - keep battlecards aligned with what is live on competitor sites.
Why visual diffs matter
Text-only diffs miss layout moves: a price that looks the same in HTML but moved above the fold, a trial button that changed color, a comparison table reordered. Visual comparison shows stakeholders what a human would notice-critical when you need buy-in to respond to a competitor move.
Learn more in our guide on visual diff vs HTML diff.
When to start
Start if you currently:
Manually check the same 5–20 URLs every week
Learn about competitor pricing changes from customers instead of your own watchlist
Debate “did they change that?” in Slack without shared proof
Most teams set up their first monitors in minutes-paste URLs, pick a schedule, review the timeline when meaningful deltas appear. See how GetWhatChanged works or compare plans.
Frequently asked questions
Is website change monitoring legal?
Monitoring publicly accessible pages for competitive research is a common business practice. Follow your jurisdiction’s laws, respect robots.txt where applicable, and use data responsibly-do not republish copyrighted content as your own.
How is this different from Google Alerts?
Google Alerts surface mentions of keywords across the web. Change monitoring watches specific pages you list and compares them over time-ideal when you care about a pricing URL, not every blog post that mentions a brand.
Do I need engineers to set it up?
No. If you can paste a URL and choose a check frequency, you can run your first monitor. GetWhatChanged is built for operators, not SRE tickets.