I m building Recordar Palabras, a small web + iPhone app for words you choose yourself. I m curious about the habit, not asking for votes:
When you meet a useful word while reading, what do you do so it is still available a week later?
A simple loop has worked well for me: capture one word, hide the definition, try to recall it, then review it when it is due. The app keeps definitions manual or generated in the active language and does not publish decks or progress.
If you learn in Spanish or English, what breaks in your current workflow? Concrete examples would help shape the launch.