The SuperNote A5 is the first product released by a Japanese company called Ratta. They have been working on this device before the Remarkable came
Supernote A5X e-ink notebook
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Handcrafted Leather Cover for Supernote A6 X2 Nomad A5 X A6 X
Supernote A5 X Review: A Writer's Nirvana – eWritable
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A6X2 Nomad & long term Supernote review - The best notebook I own
Supernote vs Quaderno for research: a continuously updated review
E-reader Comparison: Remarkable 2 vs Supernote A5X vs Boox Note
Supernote A5 X digital notebook review - Distraction-free notepad
Open-Box Supernote A5 X LAMY Set – Ratta Supernote
Supernote Native Note-Taking App: The Ultimate Guide! – eWritable