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Weektodo is a similar app, it has web version and apps for all OS. And it's open source.

From the repo’s read me:

“For now the WeekTodo it is a Freeware application and not open source.”

Can confirm, not open source

I'm kind of a privacy nut, but it's hard to take anyone seriously who says, "We're not open-sourcing this, but you can totally, 100% trust us."

From that github link:

"The code of this repo belongs to the app landing page and not to the application"

So it's not open source at all as others have mentioned.