How Wordbrush works, and why
how Wordbrush works, and why it works the way it does.
a day you can finish
Most apps hand you an endless queue. Wordbrush hands you one number: today's plan, and an end to it. You set the size, but the day stays bounded, because a day you can finish is a day you come back to. Memory rewards returning more than it rewards long single sittings, so the app would rather you do a little most days than burn out on a marathon. And when reviews pile up - when words you have already met start slipping - new words quietly pause. Catching what is fading matters more than piling on more to forget.
one word, a few ways in
A word is not a single memory. Seeing a character and knowing what it means is a different act from hearing it and catching it, which is different again from producing it yourself from the meaning alone. Each is its own path to the same word, and a path you never walk stays weak. So a word arrives as a small set - recognition, listening, production, and tracing the character - trained as separate cards. They begin together on the same day but are then scheduled apart, because a word met on different days, in different ways, holds far better than the same thing drilled twice in a row.
the schedule learns you
Memory fades on a curve: sharp at first, then gentler, until a word is gone. Review too early and you waste the effort; too late and you are relearning from scratch. The app aims for the moment just before you would forget - late enough to be worth doing, early enough to still catch. It does this for every card, and it learns your curve from your own reviews, so the timing bends toward how fast you personally forget rather than an average of strangers. There is nothing to tune. You rate how each card went, and the next date follows from that.
the tone is half the word
In Mandarin the tone is not decoration. Change it and you have changed the word, and a wrong tone is the quickest way to not be understood. So tone is graded inside the ordinary flow, never sealed off in a separate quiz. When a card asks for the tone and you rate it easy, you are claiming both the word and its tone; get the tone wrong and it was not easy. And hearing the tones apart comes before saying them - the ear has to sort the four apart before the mouth has any hope of making them - so listening asks you to catch the tone before production asks you to make it.
sentences are for using, not keeping
A word lives in sentences, so the app shows you words inside them. But the target is the word, not the sentence. If one example stayed forever you would simply memorize that sentence and learn nothing more about the word. So the sentences rotate: fresh context each time, the word doing its work in a new setting. And a sentence you have seen a few times retires on purpose - it has done its job, and a familiar sentence teaches less than an unfamiliar one. What you keep is the word, loose enough to meet it anywhere. The examples are scaffolding, and scaffolding is meant to come down.
the drills your mistakes summon
Some words blur together - a tone you keep confusing, characters that look alike, sounds that sit close. The app does not drill these from a fixed list. A comparison drill appears only when your own reviews show you actually mixing that pair up, so you practice the distinctions that trouble you and skip the ones that do not. And it does not pounce the instant you slip. The drill is spaced away from the mistake, not stapled to it, because telling two things apart is a skill you build over time on words you already know - not a penalty delivered on the spot.
say it before you see it
Beginners do not speak by assembling grammar. They reach for whole ready-made lines, the chunks a moment calls for. Reply practice rehearses exactly that: a short prompt, and you answer out loud before anything is shown. The answer stays hidden behind a press on purpose. Production only tests you if you commit first - peek at the model line and you will nod along, sure you knew it, having practiced nothing. So you speak into the silence, then hold to reveal and grade yourself honestly against the answer. It opens up once you have around a hundred words to build replies from.
reading while listening
When you finish the day, sometimes a short story is waiting. You read it while a voice reads it aloud, and the two together weld the sound of a word to its character, each holding the other in place. Almost every word is one you already know, and that is the point: understanding a story you can nearly all follow is what makes language stick, far more than decoding one you cannot. The few underlined words are a quiet preview of what is coming next. And a story returns a handful of times - not to reread, but to re-listen, because hearing again what you already understand is how understanding turns into speed.
what is not here
No ads. Nobody is paying for your attention, so nothing is built to keep you scrolling. No account, no sign-up, no email; the app never asks who you are. No streak shame - there is a streak if you like one, but missing a day costs you nothing and guilts you about nothing. No AI chatbot playing tutor: the words, the audio, the sentences, and the stories were all made and checked ahead of time. And no server. Everything is bundled into the app and runs offline. It works on a plane, and it never phones home about you.
one idea underneath all of it: a finishable day of the right words, met the way you will really use them, each returning just before you would forget.