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Instapaper user here, with same questions

Unlike Instapaper, which focuses on saving full articles for reading, PostPocket is designed for quickly saving and organizing content via share extension from any mobile app, allowing seamless capture without interrupting your scrolling. PostPocket saves links and associated metadata rather than the full content to ensure privacy and data security.

In other words, frame it as benefits, not features.

I've used wallabag for this

Thanks for the feedback! I may not have expressed it clearly—PostPocket lets you save content from any mobile app using a share extension, so it won’t disrupt your scrolling. You can revisit the saved posts later through the app.