# URL Watch overview > Track a specific list of URLs for changes on a schedule and capture the diff between crawls. When to use URL Watch over the Stream, and how it works. URL Watch monitors a **specific set of URLs** you choose, re-crawling each on a schedule and recording what changed since the previous crawl. Where [Stream](/stream/overview) watches the whole web for a pattern, URL Watch watches pages you already know about. Not sure whether you want Stream or URL Watch? See [Stream vs URL Watch](/get-started/stream-vs-url-watch). ## When to use it - Track a competitor's pricing or product page for edits. - Watch a changelog, status page, or policy page for updates. - Monitor a handful of landing pages you don't own. ## How it works You add a URL and pick a **frequency**. Firehose crawls it on that cadence, compares the new content against the last snapshot, and stores a **diff** of what was added and removed. The most recent crawls and their diffs are visible per subscription. ```text Watched URL + frequency ──▶ scheduled crawl ──▶ diff vs last snapshot ──▶ crawl history ``` URL Watch is managed from the [dashboard](https://firehose.com/url-watch) or over HTTP with the [URL Watch API](/api-reference/url-watch-endpoints). It is **not** billed per match the way the API stream is — usage is metered as **checks** against your plan's monthly quota (see [Quotas & limits](/url-watch/quotas)). ## In this section Add a URL, choose a frequency, preview, and bulk-import. Read what changed between crawls. Monthly checks, watched-URL caps, and minimum frequency by plan. Create and manage watches and read diffs with a management key.