About LeftSize

LeftSize is Dependabot for cloud waste: a GitHub App and an open-source GitHub Action that check your AWS, Azure and Cloudflare accounts every day with read-only access, and open an issue in GitHub or Jira for every idle or orphaned resource, every upcoming retirement or extended-support charge, and every security or governance gap it finds. Each issue lists the resources, the estimated monthly savings where they can be priced, and how to fix it.

Who builds LeftSize

LeftSize is built and operated by MindByte, based in the Netherlands.

Why issues instead of a dashboard

Cloud waste and missed retirement dates are rarely a tooling gap: the cloud providers already show recommendations. They stay unfixed because nobody owns them. LeftSize puts each finding where your team already works, in a GitHub repository or a Jira project, as an issue that can be assigned, discussed, snoozed or closed, and keeps it up to date on every scan.

How LeftSize works

  • The scan runs as a GitHub Action in your own workflow, with a read-only role you create (for Cloudflare, a read-only API token stored as a GitHub secret). LeftSize never connects to your cloud, and your credentials never leave your runner.
  • The 217 rules (98 for AWS, 93 for Azure, 26 for Cloudflare) are Cloud Custodian policies (Cloudflare through a Cloud Custodian provider that ships with the action), published with the MIT-licensed action, so you can read exactly what is checked and what is sent.
  • LeftSize receives only the findings: resource IDs, the rule, the configuration fields the rule uses, tag names (never tag values) and the estimated savings. It turns them into issues in your GitHub repository or, if you link a Jira site, in the Jira projects you choose.
  • Coding agents such as Claude Code, Codex and Cursor can work with the findings through the GitHub CLI, with the LeftSize agent skill.

Data and privacy

The privacy policy describes what LeftSize stores, where and for how long. The security and data page in the documentation lists the exact permissions of the GitHub App and the cloud roles.

Contact

Questions, feedback or a rule you'd like to see: emailhi@leftsize.com, or open an issue on GitHub.

Install LeftSize