The free toolbox that makes DevOps and SRE work easier

Each tool runs in your browser and follows the official docs it links to. No sign-up, no tracking cookies.

Networking

IP range, subnet mask and usable IPs on AWS, Azure and GCP for any CIDR.

Evaluate cidrsubnet() and plan VPC subnets, with copy-ready HCL.

Plan per-AZ subnets by tier with room to grow, plus Terraform.

Find overlapping CIDR blocks between VPCs before you peer them.

How many pods fit per node, and how many nodes you need.

How much of a node's CPU and memory is left for pods on GKE, AKS and EKS.

Turn 250m or 0.5 into cores and millicores, and catch mistakes like 500M.

Turn 512Mi or 129e6 into exact bytes, compare M with Mi, and catch the 400m mistake.

CronJob schedule in plain English, next runs in its timeZone, plus a manifest.

Cron in plain English, next runs in any time zone, and warnings for common mistakes.

Allowed downtime per day, month and year from an uptime %, or the % from a downtime.