DOI checker is a tool for the author waiting paper publication by check the DOI in https://www.doi.org. You can run the ***.py directly when your computer has install Python 3. Before run the .py file, you should install the dependent package, whick you can find in start of the .py file.

CMD pattern runs in the terminal.

GUI pattern has two patterns, click check and auto check.

click the button once, the software checks it once.

The user can set a check cycle, and the software will scanning it automatically at intervals.