The best replacement for noteshelf is penultimate.

The best alternatives to noteshelf are rated as following:
★★★★★  penultimate
★★★★★  notability
★★★  zoomnotes
★★  notetaker hd
★★  goodnotes 4
★★  goodnotes
★  notes plus
★  bamboo paper
★  daily notes
★  upad
★  noteledge
★  note taker hd

Your alternative for noteshelf is not listed? Suggest!
Speaking about noteshelf, one probably shouldn't forget about jot script.

Other search terms related to noteshelf and their ratings are:
★★★★★ jot script
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noteshelf
penultimate
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