Duendillo keeps track of every word and grammar rule you learn, predicts when each one will start to fade, and brings it back just in time. Short lessons, unlimited practice, explanations in your language.
Free during early access. No sign-up needed yet.
Two models work behind every session. You never see the math — only the right exercise at the right moment.
Every answer updates an estimate of each grammar skill. Topics you have mastered step aside; the shaky ones come back more often.
Each word has its own memory curve. Duendillo schedules a review for the moment you are about to forget it — not a day too early, not a week too late.
Exercises are picked so that you succeed most of the time but still have to think. New words arrive at the pace you choose.
This is how exercises feel in the app: instant feedback, forgiving with typos, strict where an accent changes the meaning.
In the app, every answer also updates your skill map and the review plan of each word.
Lessons take 10–15 minutes: a bit of theory, a few new words, practice — and a mixed review at the end.
Sounds, stress and survival phrases.
3 units
Everyday topics and the grammar of a full A1–A2 syllabus.
20 units · over 900 words · 40 grammar topics
Not a beginner? A short placement test finds your level and opens the right lessons.
43 grammar rules, each with tables, examples with audio and common mistakes — and a button to practice it right away.
Both mean “to be”. Ser is for what something is — identity, origin, character: Soy profesora. Estar is for where and how something is right now: Estoy cansada.
| ser | soy · eres · es |
| estar | estoy · estás · está |
Common mistake: Soy cansado → Estoy cansado
Hotels, airports and stations, sightseeing and trouble on the way.
The market, cooking at home and ordering at a restaurant.
Looking for a job, the office, working conditions and colleagues.
Symptoms, the doctor and the pharmacy, accidents and emergencies.
School and university, exams, studying abroad.
Pick the Spanish you need. Words, grammar and voices follow your choice. If you answer with the other variant's word, it still counts — with a friendly hint.
Native voices: fourteen from Spain, and accents from Mexico, Argentina, Colombia, Chile, Peru, Venezuela, Cuba and the US. Turn on the ones you want to hear.
Mi ordenador es nuevo. ¿Vosotros tenéis uno?
Mi computadora es nueva. ¿Ustedes tienen una?
The interface is available in 11 languages; words, examples and grammar rules are translated into 9.
Exercises are checked by our own code, not by paid AI, so there is no daily limit on lessons, reviews or practice.
When a lesson is done, the Practice hub has more — still free and unlimited.
Your recent wrong answers and weakest words in one session.
Five mixed questions a day, with a streak of its own.
Smart search finds any form: fui leads to ir and ser.
Pick verbs and tenses and drill the forms.
Short texts by topic and level, with questions.
Practice a grammar rule whenever you want.
Everything that exists is free while Duendillo opens to its first learners.
Unlimited exercises and the courses from A0 to A2 stay free, also after paid plans arrive.
Early learners get a lifetime founder discount on paid plans and finish the courses they started for free.
Planned, without dates. This list changes as features arrive.
Conversations, and feedback on your writing and speaking.
The subjunctive, the future, the conditional and much more.
Duendillo for Android and iOS.
Yes, during early access everything is free. After that a free plan stays, with unlimited exercises and the courses from A0 to A2.
Both. Choose Spanish from Spain or from Latin America when you start, and change it any time; your progress stays.
Yes. The A0 course starts with the sounds of Spanish, stress and survival phrases, then the A1–A2 course follows.
Early access will be free. Until then, see how it works or read the blog.
Early access — soon
