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Checkly vs Sentnl

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

Checkly compared with Sentnl
Detail ChecklySentnl logo Sentnl
What it doesThe active reliability layer for developers & agents Protect your client retainers from silent AI failures
StageGrowing Not given
FoundedNot given Not given
Based inNot given Not given
Pricing modelFreemium Freemium
PricingFree tier for personal projects with 10 uptime monitors and 1,000 browser checks. Starter at $24/month with 50 uptime monitors and 3,000 browser checks. Team at $64/month with 75 uptime monitors and 12,000 browser checks. Enterprise with custom pricing and unlimited features. Free: 500 transactions per month, no credit card required
Key features
  • Uptime monitoring
  • Synthetic browser tests
  • API and multistep checks
  • Heartbeat monitoring
  • Status pages
  • AI root cause analysis
  • OpenTel tracing
  • Monitoring as code
  • Global monitoring locations
  • Real-time transaction monitoring
  • Empty output detection
  • Instant email notifications
  • 5-minute webhook setup
  • Integration with major automation platforms
  • No database required
  • Free tier with 500 transactions monthly
What makes it different
  • Code-first approach with TypeScript/JavaScript, Terraform, and Pulumi
  • AI-native workflow with agent integration and prompt-to-monitor in seconds
  • Unified platform combining testing, monitoring, incident management and observability
  • AI root cause analysis with Rocky AI for automated failure diagnosis
  • Built specifically for AI agencies and freelancers managing client workflows
  • Catches soft failures instantly before clients notice
  • No credit card required for free tier
  • Simple webhook integration without custom monitoring scripts
Free planNot given Not given
Open sourceNot given Not given
PlatformsNot given Not given
Public APINot given Not given
Community votes00
DR (Domain Rating by Ahrefs)74 no change since last check2 +2 (up) since last check
Trust Flow (Majestic)350
Citation Flow (Majestic)515
Referring domains (Majestic)235920

5 details filled in for both companies.

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