Postman software is tools that use for execute HTTP request with methods (put,get and ...)
This software is free and you can save all request in cloud
The synchronize data is auto with Postman but it take about 5 second for sync
Can i stop it or use it offline only?
Currently you can't turn off sync, you have to sign out of postman to prevent it.
tl;dr – Store your sensitive data within the Current Values field in the environment template so that it isn’t synced.

Turning sync off isn’t possible but they added the notion of Sessions in a previous release that enables you to store sensitive information (API keys, tokens, etc) as environment variables that aren’t synced.
Sessions FAQ – https://blog.getpostman.com/2018/08/09/sessions-faq/
The RFC – Sessions in Postman 8
Data in Current Value is not synced to Postman’s servers. It is a common security practice to store passwords/keys/tokens in Current Value, and use the Initial Value column as a placeholder.
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