SignalWatch vs Ultraviolet Observability

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 Ultraviolet Observability
Detail	SignalWatch	Ultraviolet Observability
What it does	Know when a public page changes	Self-hosted observability platform for Kubernetes that keeps all telemetry data within your firewall
Stage	Not given	Startup
Founded	Not given	Not given
Based in	Not given	Not given
Pricing model	Freemium	Paid
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.	Evaluation: Free for 30 days with full-function core and unlimited nodes during trial. Connected: $25 per node per month with 10-node minimum, billed on node-minutes. Air-gapped: Annual hand-carried license with no call-home. No per-GB, per-span or per-user fees.
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	Distributed traces and APM with automatic instrumentation across HTTP, gRPC, DNS and databases Logs correlated to traces with severity faceting and live tail Metrics pipeline supporting Prometheus remote-write and Fluent Bit Kubernetes and infrastructure monitoring with node and workload health Dashboards, SLOs with error budgets and Datadog dashboard import Local alerting rules evaluated inside the core routed to Slack, PagerDuty, Teams or email Real user monitoring with Core Web Vitals, session replay and browser to backend trace stitching Multi-site support with remote clusters dialing home over outbound mTLS OpenTelemetry-native support for OTLP over gRPC and HTTP No code instrumentation required for application tracing
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	Zero telemetry egress and all data stays on customer infrastructure Predictable pricing based on node-minutes with no per-GB or per-span charges Automatic instrumentation with no code changes required
Community votes	0	0
DR (Domain Rating by Ahrefs)	9 no change since last check	23 +5 (up) since last check
Trust Flow (Majestic)	6	0
Citation Flow (Majestic)	24	20
Referring domains (Majestic)	13	5

5 details filled in for both companies.

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