# Time Machine

> **Time Machine** is a handy instrument that helps you to see different versions of an app by toggling the time machine bar back and forth.

After having Qlik Helper activated in Gitoqlok, [save your app to the repository and make some commit history](https://docs.gitoqlok.com/tutorials/environment-migration/export/create-repository).\
For the current example the color scheme of the charts are changed. Two versions are *saved and committed* to the repository:

!\[Version 1]\(../../.gitbook/assets/Screen Shot 2022-10-13 at 18.27.08.png)

*Version 1*

!\[Version 2]\(../../.gitbook/assets/Screen Shot 2022-10-13 at 18.27.25.png)

*Version 2*

By clicking on the details icon in the sheets menu, select "Time Machine".

!\[Gitoqlok Helper Time Machine]\(../../.gitbook/assets/Screen Shot 2022-10-13 at 18.31.42.png)

*Gitoqlok Helper Time Machine*

On the top of your page, you can explore the commit history to interactively travel back and forth in time to see how the version of your sheet was changed:

## Timeline Swimlanes

Since Release 2.1.0 Time Machine and Diff Viewer timelines have swimlanes that separate users' commits:

## Alternative: video tutorial