Free Tools — Part of Project Helena
The DevOps toolkit.
24 free, no-signup tools across cost, metrics, uptime, tracing, and logs. All updated with 2026 prices and current best practices.
Cloud Cost 10 Read the guide →
AWS and Kubernetes pricing calculators with current 2026 rates.
EKS Pricing Calculator
AWS EKS control plane ($0.10/hr) + EC2 or Fargate compute
Open →ECS Pricing Calculator
AWS ECS (no control plane fee) on Fargate or EC2
Open →Lambda Pricing Calculator
Requests + duration cost, x86 vs ARM, free tier
Open →S3 Cost Calculator
Storage + requests + egress across 7 storage classes
Open →NAT Gateway Cost Calculator
AWS NAT Gateway: $0.045/hr + $0.045/GB by region
Open →Data Transfer Cost Calculator
Egress, cross-AZ, cross-region, CloudFront
Open →RDS Pricing Calculator
Instance + storage + Multi-AZ + backup
Open →Kubernetes Cost Estimator
Compare K8s cost across EKS, GKE, AKS
Open →Container Size Calculator
Right-size container CPU and memory limits
Open →Downtime Cost Calculator
Cost of downtime per minute by revenue
Open →Metrics & Observability 4 Read the guide →
Prometheus cardinality forecasting, percentiles, error budgets, SLA math.
Uptime & Reliability 3 Read the guide →
Live availability checks, SSL/TLS validation, HTTP reference.
Distributed Tracing 1 Read the guide →
Trace sampling and tracing-backend cost modeling.
Log Management 1 Read the guide →
Log volume and retention cost forecasting across major vendors.
DevOps Utilities 5
Day-to-day developer and operator tooling.
Cron Expression Generator
Visual cron builder with explanations
Open →YAML Validator
Validate YAML, convert YAML ↔ JSON
Open →Regex Tester
Live regex matching with DevOps presets
Open →On-Call Rotation Generator
Create fair on-call schedules
Open →Postmortem Template
Blameless incident postmortem template
Open →Beyond Tools
Need continuous monitoring or cost attribution?
These tools help you calculate. Warden monitors your endpoints 24/7. Recon attributes K8s cost by namespace and pod.
Join the waitlist →