What "standalone" means
A standalone reading pen has its own screen or indicator lights, its own speaker, and its own processor built in. Scanning a word, recognizing it, and reading it aloud all happen on the device itself — nothing is sent to a phone, app, or the internet to make it work.
A connected pen, by contrast, needs to be paired with a phone, tablet, or computer to display or speak the scanned text. Both approaches can scan and read text aloud; the difference is what else has to be true for that to happen.
Why the distinction matters in practice
For a reader who gets stuck on a word, a standalone device removes every step between the moment of getting stuck and hearing the word: no unlocking a phone, no opening an app, no waiting for a Bluetooth connection. That matters most for readers who need help often and quickly, and for anyone who wants to keep a phone out of the reading task entirely.
A connected pen can still be the better fit — for a workflow built around typing scanned text into a document, or for a buyer who already has a phone within reach and doesn't need the device to work without one.
What to check before buying
Not every device marketed as a "reading pen" is genuinely standalone. Before buying specifically for standalone use, confirm the device reads aloud through its own built-in speaker with no paired phone, tablet, or computer required — some connected devices are styled similarly but still need a host device to do anything.