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Best change detection software in 2026
A side-by-side comparison of every serious website change detection tool on the market. Honest features, real pricing, and a head-to-head page for each tool below.
| Feature | OnChange | Visualping | Distill.io | Hexowatch | ChangeTower | changedetection.io | Wachete | Versionista |
|---|---|---|---|---|---|---|---|---|
| Free plan | ||||||||
| Cloud (no browser required) | ||||||||
| Sub-minute checks | ||||||||
| Visual (screenshot) diffs | ||||||||
| API / JSON monitoring | ||||||||
| AI change summaries | ||||||||
| Git commit attribution | ||||||||
| WCAG accessibility scans | ||||||||
| Slack / Discord alerts | ||||||||
| Custom webhooks | ||||||||
| REST API | ||||||||
| Self-serve pricing |
Yes, Partial, No. Based on publicly available information as of May 2026. Vendor features may have changed since publication.
Why teams switch to OnChange
Most change detection tools were built for one audience: marketers watching competitor pages. OnChange is built for the rest of the stack too. The product covers four monitor types deeply (text, visual, API, accessibility) and ties every detected change back to the code that caused it.
Sub-minute checks on every plan family
Pro detects changes in 60 seconds, Business in 30, Enterprise in 10. Other tools start at 5 to 15 minutes.
API monitoring is first-class
Dedicated JSON diff UI with JSONPath targeting. Track schema drift and breaking changes alongside page diffs.
AI change summaries on every alert
Plain-English explanation of what changed and why it might matter, attached to every notification.
Causal attribution
Every detected change is matched against your repo's recent commits. Stop asking 'who deployed what'.
WCAG accessibility scans included
Full axe-core scans with attested baselines, ready for VPAT and agency client reports.
Honest, self-serve pricing
Free plan with every feature. Pro from $12/month. No annual contracts, no demo gating, no procurement.
Head-to-head: OnChange vs every tool
Each comparison page covers feature parity, pricing, and migration notes for that specific vendor. Pick the one that matches what you're evaluating.
OnChange vs Visualping
Polished consumer / marketing change monitor with strong visual diffs.
Pick OnChange if: You need sub-minute checks, API monitoring, or commit-aware attribution.
Read comparisonOnChange vs Distill.io
Browser-extension-first monitor with cloud add-on.
Pick OnChange if: You want monitoring that runs even when your laptop is closed.
Read comparisonOnChange vs Hexowatch
Broad suite of 13+ monitor types under one roof.
Pick OnChange if: You want depth over breadth on the four monitor types that matter most.
Read comparisonOnChange vs ChangeTower
Marketing-leaning cloud page monitor with clean reporting.
Pick OnChange if: Your team also needs API monitoring, accessibility, and a REST API.
Read comparisonOnChange vs changedetection.io
Popular open-source self-hosted change monitor.
Pick OnChange if: You'd rather not run servers, queues, and chrome pools yourself.
Read comparisonOnChange vs Wachete
Long-running no-frills cloud monitor with email and SMS alerts.
Pick OnChange if: You want modern alerting, sub-minute checks, and a clean UI.
Read comparisonOnChange vs Versionista
Enterprise web archival and change tracking with annual contracts.
Pick OnChange if: You want self-serve pricing, faster checks, and a developer REST API.
Read comparisonStill deciding? Read the buyer's guide
A practical, vendor-neutral framework for choosing a change detection tool: what to evaluate, the questions to ask in a trial, and the red flags to walk away from.
No credit card. 5 monitors, every feature.