Product comparison
OnChange vs ChangeTower
ChangeTower is a polished, marketing-leaning page monitor that focuses on visual and content alerts. OnChange covers the same ground and adds the things engineering and agency teams need: API monitoring, accessibility scans, sub-minute frequency, and a REST API.
Both products detect when web pages change and notify you. The difference is depth on the technical side. If you're a marketing team watching competitor landing pages, ChangeTower is a fine fit. If your monitoring footprint includes JSON APIs, deploy-aware debugging, or accessibility compliance, OnChange is the broader platform.
Feature comparison
Scroll horizontally to compare both products.
| Feature | OnChange | ChangeTower |
|---|---|---|
Free plan available OnChange free: 5 monitors with all alert channels and full API access. ChangeTower Free: 3 pages with daily checks. | ||
Cloud-based, runs without a browser | ||
Sub-minute check intervals ChangeTower lists daily checks on Free and Lite, hourly checks on Essential and Business, and custom Enterprise terms. OnChange reaches 30 seconds on Business and 10 seconds on Enterprise. | ||
Visual (screenshot) diffs | ||
Text and content diffs | ||
CSS selector targeting | ||
API / JSON endpoint monitoring ChangeTower is a page-monitoring product; it does not diff JSON API responses natively. | ||
AI change summaries (paid plans) | ||
Git commit correlation A linked repository lets OnChange compare a detected change with recent commits and surface possible explanations for review. | ||
WCAG accessibility scans | ||
Free public screenshot tool OnChange ships a free anonymous URL-to-PNG tool at /tools/screenshot. | ||
Slack / Discord alerts ChangeTower offers Slack on higher tiers; OnChange includes both on the free plan. | ||
Custom webhooks | ||
REST API for monitor lifecycle | ||
Team collaboration | ||
Change history retention OnChange: 90 days of full diff history on every plan. |
OnChange plan availability: visual comparisons, JavaScript rendering, and AI summaries start on Pro; multi-region monitoring and automations start on Business. AI features have daily usage budgets. Git correlation requires a linked repository and supports investigation by a reviewer. Compare current OnChange plan limits.
Comparison based on publicly available information. ChangeTower's feature set may have changed since publication. Verify the current details on their website.
Choose the product that fits the work
Pick OnChange if
- You need sub-minute checks for pricing, inventory, or breaking API changes
- Your team monitors APIs (REST or JSON) alongside web pages
- You ship code and want to investigate recent commits alongside a downstream change
- You're an agency or in-house team with WCAG compliance obligations
- You want every alert channel (Slack, Discord, webhooks, email) on the free plan
- You want a clean REST API to provision monitors from CI/CD or IaC
Pick ChangeTower if
- Your use case is purely marketing-focused visual monitoring on a handful of pages
- You already use ChangeTower's reporting workflow and prefer not to switch
- Daily or hourly checks meet your requirements
- You don't need API monitoring, accessibility scans, or commit-aware attribution
Pricing
ChangeTower lists Lite at $12/month for 25 pages with daily checks, Essential at $36/month with hourly checks, and Business at $78/month with hourly checks; Enterprise is custom. Its Free tier covers 3 pages with daily checks. OnChange Pro is $12/month for 50 monitors at 60-second intervals, and Business is $39/month for 300 monitors at 30-second intervals. Compare page allowances, check frequency, and billing terms together.
Pricing and check intervals reviewed September 24, 2026. This review covers the stated prices, quotas, and intervals.
Check ChangeTower's official pricing and availabilityMigration plan
Collect the URLs and monitoring rules you use in ChangeTower, then recreate a small representative set in OnChange. Verify selectors, captured evidence, baseline behavior, and notification delivery before moving the remaining watches. Keep any required historical records available and check your OnChange plan capacity before expanding the watchlist.
Try OnChange free
5 monitors, all alert channels and full API access, no credit card required. Start with one monitor and migrate at your own pace.