OnChange journal
Insights on website monitoring
Practical guides, deep dives, and use cases for teams who monitor the web, written by the team behind OnChange.
Latest field notes
14 articlesThe 2026 guide to free website screenshot tools
Free URL-to-PNG tools have moved past bookmarklets. What to look for in 2026: JavaScript SPA rendering, full-page auto-scroll, CSS selector clipping, viewport emulation, and multi-device captures.
Visualping vs Distill.io vs OnChange: A 2026 Comparison
Three of the most-searched change detection tools, compared head-to-head. Features, pricing, alert quality, and who each one is built for.
How to Choose a Change Detection Tool: 10 Things That Matter
A vendor-neutral framework for evaluating change detection tools. Ten questions to ask in a trial and the red flags to walk away from.
Best Change Detection Software in 2026: A Buyer's Guide
An opinionated, vendor-neutral comparison of the top eight change detection tools in 2026. Features, pricing, and who each one is for.
The WCAG 2.2 Compliance Checklist (A, AA, AAA)
A practical WCAG 2.2 checklist for teams preparing accessibility audits, VPAT reviews, and regression monitoring workflows.
Website Monitoring: The Complete Guide (2026)
A plain-English guide to uptime, visual diffs, API monitoring, selector targeting, accessibility scans, and alert routing for modern teams.
E-commerce Monitoring: Track Product Pages, Stock & Prices
Your site might be up but showing the wrong price or stale inventory. Learn why content monitoring is the missing layer in e-commerce.
Website Monitoring Best Practices for 2026
A comprehensive guide to setting up reliable website monitoring. Learn how to choose check intervals, configure alerts, and avoid common pitfalls.
Compliance Monitoring: Track Legal & Regulatory Website Changes
Financial services, healthcare, and legal teams need audit trails when web content changes. Automate regulatory compliance monitoring.
Website Uptime vs Change Monitoring: What's the Difference?
Uptime monitors check if a page loads. Change monitors check if the content is correct. These are fundamentally different problems.
Visual Diff Detection Explained: How Screenshot Comparison Works
Understand the technology behind pixel-level change detection. From screenshot capture to perceptual hashing.
How to Track Competitor Prices Automatically in 2026
Manual price checks don't scale. Discover how teams use CSS selector targeting and scheduled monitors to track competitor pricing.
API Monitoring 101: Track JSON Endpoints for Changes
REST APIs change without warning. Learn how to monitor JSON responses, track schema drift, and alert on breaking changes.
SEO Monitoring: Detect Website Changes That Impact Rankings
Title tags, meta descriptions, and canonical URLs can change without your knowledge. Catch modifications before they impact rankings.
Put the guidance into practice
Start with five monitors and route changes by email, Slack, Discord, or webhook.