Paperpile sits in the "Goldilocks zone"—cheaper than EndNote and ReadCube, but more expensive than Zotero (if you don't need cloud sync). For Google power users, the $35 fee is a steal compared to the hours saved wrestling with broken citation plugins.
While the above plans cover the core features, Paperpile offers additional features and services that may incur extra costs: paperpile price
It operates on a subscription model starting at $2.95 per month (billed annually). For most users, the price is surprisingly affordable for a premium tool, but it lacks a permanent free tier. paperpile price