App to compare input texts, not files?

Hello, all apps i have installed compare files/folders, but not two texts i input. For that i need to resort to online tools which is not good if i need to input private texts.

Update: “diffuse” app is in community repository and after start, i can double click and paste text which it compare, highlighting of a differences not ideal, not easy to find, but this app seems to do the job.

Meld can do that you just have to start and select a new file compare and you can type.