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To be honest, apps of this kind seem not entirely too difficult to clone as an opensource project.

Could you name the exact killer features you see in this one, compared to, say, etherpad or https://pad.envs.net ?

this is definitely not true - there's a huge depth of complexity in these multi-dimensional databases. It's relatively easy to make a proof of concept - it's "just" an array of arrays after all, but building something production quality is a multi-year endeavour

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