PDF Notes S (universal app for iPhone & iPad)
On September 23, 2019, I uploaded version 13.0.0 of PDF Notes S to App Store and it became Waiting for Review. After Apple finishes its review, it will be Ready for Sale.
App Store https://itunes.apple.com/app/id961336139
This version added a PDF creation & assembly (rotate/insert/remove page), and supports iOS 13 dark mode.
BTW, apps not developed by Apple can't recognize 3 or 4 fingers gestures in iOS 13.0. Since iOS Cache Table 13.1 Beta 3, they are recognized correctly.