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about smart defrag https://portableapps.com/apps/utilities/smart_defrag_portable
is it stealth ?
Without knowing more about what you consider stealth to be, no.
about stealth i mean
For the purpose for this website, "stealth" means when an application is launched, used and terminated properly, it does not leave behind any entries in the registry or filesystem. Certain exceptions are permitted. For example, registry entries that are created/updated by Windows for the application (eg. MRU entries for dialog boxes, DirectX entries for DirectX-based apps), or temp files created in the official "Temp" folders are not taken into consideration. Note: "Stealth" does not mean non-traceability! In fact, it is quite unlikely you can hide your activities on a Windows machine from a capable system administrator.
first of all I don't agree with that definition from http://www.portablefreeware.com
what I know about Smart Defrag
1) it is a long standing PA, we'd almost certainly know about it if it behaved badly
2) it may check if updates are available (a form of calling home), lots of Apps do this
3) if you you choose Boot Time defrag, that will be even more noticeable as (if you have the right permissions) it makes changes that survive a reboot
4) defragging is by definition not something that you should expect will go un-noticed so defrag + stealth doesn't even make sense if you think about it