# Tools — Zen Inbox Cleaner

Last reviewed: August 30, 2026. HTML version: https://zeninboxcleaner.com/tools/

Small, free tools that run entirely in your browser — no sign-in, no account, and nothing you type is sent anywhere. Use them with or without the app.

- [Email Hoarder Calculator](https://zeninboxcleaner.com/tools/email-hoarder-calculator) — enter how many emails are sitting in your inbox and get the estimated storage they hold, how long clearing them by hand would take, and your official hoarder rank. Markdown mirror (the full formula and assumptions in plain text): https://zeninboxcleaner.com/tools/email-hoarder-calculator.md
- [Gmail Cleanup Query Builder](https://zeninboxcleaner.com/tools/gmail-cleanup-query-builder) — tick what you want to find and get the exact Gmail search to paste into the search box, built only from operators Google documents. Markdown mirror (every operator with its documented meaning, plus worked examples): https://zeninboxcleaner.com/tools/gmail-cleanup-query-builder.md
- [Storage Diagnoser](https://zeninboxcleaner.com/tools/storage-diagnoser) — two or three questions and you land on the fix for your actual storage problem, including the ones an email cleaner can't fix. Markdown mirror (the whole decision tree as text): https://zeninboxcleaner.com/tools/storage-diagnoser.md
- [Inbox Time-Cost Calculator](https://zeninboxcleaner.com/tools/inbox-time-calculator) — how much of your year goes to email you never wanted, in hours and work-weeks, on assumptions you choose yourself. Markdown mirror (the formula and every preset in plain text): https://zeninboxcleaner.com/tools/inbox-time-calculator.md

More tools will appear here over time. For storage-full problems, see the Answers hub: https://zeninboxcleaner.com/answers/ · Suggestions: support@zeninboxcleaner.com