Change Detection Software
Compare a page over time and flag the updates that matter, in a sentence.
Change detection software compares a page over time and flags the updates that matter. "Matter" is the product decision. Hashing every byte is easy. Deciding that a cookie banner is not a price cut is the work.
Open source HTML watchers are good at the hash. Visual tools are good at the picture. Semantic tools are good at the sentence. Buy the one that matches the report you want on Friday.
Three families, one search query
Pixel: Visualping, and cousins. Selector: Distill. Raw HTML: ChangeDetection.io. Meaning: AyeWatch. The ChangeDetection alternative post is the self-host comparison. This page is the category landing.
AyeWatch reads the page and summarizes. You do not maintain XPath. You do not keep a laptop awake. You do not get a red overlay as the primary artifact. You get "the Pro plan added a 50-topic cap and kept the $9 price."
What the software should not pretend to be
It is not uptime monitoring. It is not a CDN. It is not a legal archive unless you export and store the snapshots yourself. AyeWatch keeps the watch and the alert. If you need a chain-of-custody screenshot, use a visual product and save the file.
Free Preview is six lifetime runs, three topics, Daily or slower, push and in-app. Pro is $9 a month, 50 topics, six-hour checks. Paid adds email, Slack, Discord, and webhooks.
Start a monitor in under a minute
Free Preview is six lifetime runs across three topics. No card.
Try AyeWatch freeHow to evaluate in one afternoon
Point every candidate at the same pricing URL. Change nothing. See who fires on noise. Then edit a test page you control, or wait for a known competitor edit. Keep the tool whose first useful alert is a sentence you could forward.
If you already run ChangeDetection and like the diffs, stay. If the queue is full of banner noise, switch the detector class, not the caffeine. Change detection software is a category people buy twice. Once as a screenshot toy. Again as a reader when the toy goes mute. Skip the first purchase if you already know you want the sentence. Buy the reader once. If the first useful alert is a sentence you can forward, you bought the right class of change detection software.