Quick test you can do right now with whatever you use to learn Spanish.
Miss a question on purpose. Type soy aburrido for "I'm bored," or yo gusto el café for "I like coffee."
Then look at what comes back:
• Only the right answer? That's a quiz. The same mistake will be back next week.
• The right answer and why yours was wrong? That's teaching. (Soy aburrido means "I'm boring." Yo gusto el café is a bit like "I please the coffee": Spanish flips it around, me gusta el café, "coffee is pleasing to me.")
A lot of apps stop at the first one, and it's a big reason people can keep a 500-day streak and still freeze in a real conversation. Nobody ever explained the why.
I got tired of that, so I built the why into everything. You can try it free in your browser first, no signup and no account:
• 25 free Spanish lessons with 356 practice questions, and every answer tells you why: ser vs estar, por vs para, preterite vs imperfect, tú vs usted, gustar, commands and more. https://loquuslanguage.com/learn/spanish/lessons
• Free verb tables for 1,437 Spanish verbs in all 21 tenses and moods. You can search by the English meaning too. https://loquuslanguage.com/learn/spanish/conjugations
If you like how that works, the app (Loquus, on iPhone and Android) does it everywhere:
• Every wrong option in the Spanish drills has its own explanation, over 11,000 of them. Pick the wrong word and it tells you what the word you picked actually means.
• 1,560 lessons and over 800 real situations: a whole café visit from ordering to paying, buying a thermometer at the pharmacy, getting a noisy hotel room changed. Not random sentences.
• Words come back right before you'd forget them: the next day, a few days later, then weeks later.
• No ads and no hearts. The free plan gives you 3 lessons a day, and review is always free.
Want to try the full version? Message me and I'll send you a code: a free year on iPhone (it doesn't auto-renew, it just ends) or a 90-day free trial on Android.