The latest articles on DEV Community by Kanwar Kohli (@kanwar_kohli). https://dev.to/kanwar_kohli https://media2.dev.to/dynamic/image/width=90,height=90,fit=cover,gravity=auto,format=auto/https:%2F%2Fdev-to-uploads.s3.amazonaws.com%2Fuploads%2Fuser%2Fprofile_image%2F3929700%2F52519bac-2d85-4f66-af47-5306edcca82c.png https://dev.to/kanwar_kohli en Kanwar Kohli Wed, 13 May 2026 16:03:47 +0000 https://dev.to/kanwar_kohli/built-a-small-tool-that-tells-you-why-your-aws-bill-changed-each-week-3klo https://dev.to/kanwar_kohli/built-a-small-tool-that-tells-you-why-your-aws-bill-changed-each-week-3klo <p>Over the past year I kept seeing the same AWS problem across founders and small engineering teams: the bill changes faster than people can explain it.<br> Usually nobody notices until month-end, and by then they're digging through Cost Explorer trying to figure out which service changed, what deployment caused it, and whether it's real growth or waste.<br> So I built a lightweight tool called ThinCost.<br> It connects to AWS using a read-only IAM role and sends a weekly email explaining what changed, which services drove the increase, potential waste, and concrete actions to reduce spend.<br> The goal wasn't another dashboard. It was: "Tell me in plain English why my AWS bill changed."<br> Setup is about 60 seconds: email + AWS account ID → deploy a CloudFormation stack → done. No stored credentials. No write access. Read-only permissions only.<br> Looking for a handful of beta testers running real AWS workloads. Happy to give free access for a few months in exchange for honest feedback.<br> → thincost.com</p> aws monitoring showdev tooling