SignalWatch
ChangeTower alternative
Website change alerts without the visual-report stack.
ChangeTower monitors pages and surfaces what changed for human review. SignalWatch is the automation-shaped alternative: fingerprint a public URL on a schedule, store a unified text diff on every event, and deliver it by email, Slack, Discord or an HMAC-signed JSON webhook — free plan included.
| Need | SignalWatch | ChangeTower |
|---|---|---|
| Primary output | Unified text diff + change % | Change reports / visual workflows |
| Delivery | Email, Slack, Discord, signed JSON on every plan | Email; integrations vary by tier |
| API / automation | Full REST API; HMAC webhooks with retries | Enterprise-oriented; plan-dependent |
| Scope | Public HTTP(S) URLs only | Broader change-monitoring workflows |
| Noise filters | CSS selector, ignore regex, min change ratio | Selectors / regions |
| Price | Free · Pro $12/mo or $79/yr · Business $29/mo or $199/yr | Paid SaaS tiers |
Choose SignalWatch when
- The alert needs to land in Slack, Discord, n8n, or your own service as structured JSON.
- You watch public pricing pages, status banners, changelogs, or policy pages.
- You want a free starting point with every alert channel unlocked.
- You prefer the raw diff over an AI/visual summary so your code can decide.
Stay on ChangeTower when
- You need richer visual reports or enterprise change workflows beyond public-URL fingerprints.
- Non-technical stakeholders need a managed review UI more than a webhook.
- You must monitor authenticated or heavily JavaScript-rendered surfaces.
Moving a watch list over
Export or note each URL and selector. Recreate them via the dashboard or API, enable email and/or paste a Slack webhook, then use Send test alert to verify the signature and payload. See also Hexowatch and the full comparison table.
FAQ
Is SignalWatch a ChangeTower alternative?
Yes if you want an API-first monitor that POSTs the text diff to Slack, Discord, email or a signed webhook. ChangeTower is stronger for visual reports and broader enterprise workflows. SignalWatch is stronger for automation on public URLs.
Does SignalWatch keep change history?
Yes. Each monitor stores events with extracted text so the dashboard and API can show a coloured unified diff. Snapshots older than 45 days are pruned, keeping the newest text per check.
How much does this ChangeTower alternative cost?
Free for 3 monitors at 15 minutes. Pro is $12/month or $79/year for 50 monitors. No credit card to start.