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FlatLyne vs Upcheck

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 Upcheck
DetailFlatLyne logo FlatLyneUpcheck logo Upcheck
What it doesCron job monitoring that alerts you when scheduled tasks don't run Website monitoring for teams
StageNot given Not given
FoundedNot given Not given
Based inNot given GB
Pricing modelFreemium Paid
PricingFree 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 $10 base per month, plus $1 per monitored website per month
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
  • Uptime checks every 5 minutes with HTTP method, path, headers, and expected status options
  • SSL/TLS certificate expiry tracking with warnings at 30, 14, and 7 days
  • DNS record monitoring with change detection every 6 hours
  • Domain registration expiry monitoring over RDAP
  • Page change monitoring with element tracking and numerical comparison
  • TCP port monitoring on up to ten ports every 5 minutes
  • Alerts via email, Slack, Discord, Microsoft Teams, or webhook
  • Two-probe confirmation before alerts to prevent false positives
  • Full certificate details including issuer, SANs, serial, and chain
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
  • Monitors from outside the system with real HTTPS requests, not synthetic probes
  • Two-probe confirmation eliminates false alerts from transient failures
  • API monitoring built into standard uptime checks with no separate product to buy
  • Clear DNS visibility with every record checked every 6 hours for changes
Community votes00
DR (Domain Rating by Ahrefs)Not checked yet no change since last check6 +1 (up) since last check
Trust Flow (Majestic)03
Citation Flow (Majestic)1823
Referring domains (Majestic)314

5 details filled in for both companies.

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