FlatLyne 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.

FlatLyne compared with Ultraviolet Observability
Detail	FlatLyne	Ultraviolet Observability
What it does	Cron job monitoring that alerts you when scheduled tasks don't run	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 plan: 10 checks, 1 project, 1 seat, 2 alert channels, 100 ping history per check, 1 minute minimum schedule. Pro: $12/month or $108/year (25% discount), 100 checks, 10 projects, 10 seats, unlimited alert channels, 1,000 ping history per check, 30 second minimum schedule, email support, 50 Whats	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	HTTP ping-based job monitoring Support for cron expressions and interval schedules Multiple alert channels: email, Slack, PagerDuty, webhooks Exit code and log output capture Grace periods for late-running jobs Credential rotation on Pro and Business Encrypted ping URLs at rest WhatsApp and phone-call alerts on Pro Ping history retention: 100 pings on Free, 1,000 on Pro and Business	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	Detects silent failures that traditional monitoring misses: jobs that never start or run but produce no errors Minimal setup: add one curl command to your existing jobs Secure credential model: each ping URL can only ping one check, stored encrypted, with SHA-256 hashed API keys Early pricing locked in for existing subscribers while new customers pay higher rates	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)	Not checked yet no change since last check	23 +5 (up) since last check
Trust Flow (Majestic)	0	0
Citation Flow (Majestic)	18	20
Referring domains (Majestic)	3	5

5 details filled in for both companies.

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