Clipboard Cleaner appClipboard Cleaner is System tool that is open source under the MIT license. As you may know, Android clipboard content and its changes can be got by any app, which is a security hole if you care about it. Any app can get your copied password, credit card numbers, and more.
Android has AutoFill or other mechanisms to handle sensitive info. Android Q also fixes this problem partly. But there are still some ways to bypass the limit, like using accessibility services and showing a transparent window.
ClipboardCleaner can't protect your passwords from being got by any app. But it gives you ways to check and clean your clipboard.