Tools that tell you when the content of a web page changes — prices, stock, policies, competitor copy. Five compared on price, setup and alerts.
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| Tool | PageRadar | Visualping | Distill | Changedetection.io |
|---|---|---|---|---|
| Starting price | $0 free / $5/mo | $14/mo | Extension / app | Free (self-host) |
| Setup | ~60 seconds, cloud | Cloud | Install required | Docker + server |
| AI noise filtering | ✓ | – | – | – |
| Telegram alerts | ✓ | – | — | — |
| Screenshot (image) diff | – | ✓ | — | — |
Paste a URL and get alerts in about a minute. Free tier (1 URL), then $5/mo for 20 URLs with hourly checks. AI noise filtering, email/Telegram/Slack alerts, REST API, MCP server and webhooks on paid plans. Try PageRadar →
Established and polished, with visual diffs. Starts at $14/mo and API access is enterprise-only. Visualping vs PageRadar →
Browser extension or desktop app with deep selector control. Needs an install and more setup. Distill vs PageRadar →
Open source and free if you run Docker and maintain a server yourself. Changedetection.io vs PageRadar →
Wide range of monitoring types, priced above the budget end of the market. Hexowatch vs PageRadar →
Looking for uptime monitoring (is my server up)? That is a different category — UptimeRobot and Pingdom cover it. The tools above watch what a page says.
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