SignalWatch vs QuietDiff

A side-by-side comparison built from both listings. Blank cells mean the company has not given that detail; we never guess.

SignalWatch compared with QuietDiff
Detail	SignalWatch	QuietDiff
What it does	Know when a public page changes	Only alerts that matter
Stage	Not given	Not given
Founded	Not given	Not given
Based in	Not given	US
Pricing model	Freemium	Freemium
Pricing	Free: $0 (3 URL monitors, checked every 15 minutes, 45-day history). Pro: $12/month or $79/year (50 URL monitors, checked every 5 minutes). Business: $29/month or $199/year (500 URL monitors, checked every 2 minutes). All plans include email, Slack, Discord, webhooks, and REST API.	Free: $0/month with 10 monitors and daily checks. Starter: $9/month with 100 monitors and hourly checks. Pro: $29/month with 500 monitors and 10-minute checks. Agency: $99/month with 3,000 monitors and 5-minute checks.
Key features	Text change detection with unified diffs Downtime and recovery alerts TLS certificate expiry monitoring CSS selector support for page sections Ignore regex and minimum-change thresholds Email, Slack, and Discord alerts Signed JSON webhooks REST API with OpenAPI documentation 45-day alert history Test alerts before deployment	AI Significance Filtering Structured Field Diffs Confirmation Re-checks REST API and OpenAPI MCP Server for AI Agents Monitor Health Tracking Multi-Channel Alerts JavaScript Rendering with Headless Chromium HMAC-signed Webhooks AI Summaries
What makes it different	No JavaScript rendering, only fetches visible text Free plan includes webhooks and API Flexible alert destinations: email, Slack, Discord, or custom webhooks Individual URL monitoring without site crawling Scheduled checks, not instant: free every 15 min, Pro every 5, Business every 2	Re-checks every change before alerting to confirm they are real Filters out noise like timestamps, rotating ads, and footer years Shows side-by-side old and new values with AI summaries Native integration with AI agents via MCP server More monitors and faster checks per dollar than competitors
Community votes	0	0
DR (Domain Rating by Ahrefs)	9 no change since last check	Not checked yet no change since last check
Trust Flow (Majestic)	6	0
Citation Flow (Majestic)	24	0
Referring domains (Majestic)	13	0

5 details filled in for both companies.

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