A list of convictions has become a finished app. Droptiply is in the App Store, and in this final part of the series we want to show openly how its core works – the system that decides which fact falls next.
The question parents ask most
“How does the app know what my child should practise?” That’s the question we hear most often. The answer is pleasantly unspectacular, and we promise: no jargon.
When a child answers a fact wrong, say 7×8, this is what happens internally:
- The fact gets a red dot. 🔴
- Next game, it comes up sooner.
- Once it’s answered correctly three times in a row, it gets a green dot. ✅
- Green facts appear less often – but they never disappear entirely.
That’s all. No random generator, no rigid lesson plan. Just one honest guiding question: what did your child most recently not know reliably? That’s exactly what comes next.
An idea from 1885
This principle isn’t new, and that’s its strength. In 1885 the psychologist Hermann Ebbinghaus described the “forgetting curve”: we forget what we’ve learned at predictable intervals – unless we recall it again just before forgetting. Repeat a fact at exactly those growing intervals and it moves from short-term remembering into lasting mastery. Learning scientists call this spaced repetition.
Flashcard systems like the Leitner box have used the same principle for decades. Droptiply simply translates it into a form a child opens willingly – falling blocks instead of a box full of cards.
What else goes into it
Around this core, we built the app to keep children engaged for a long time without pressuring them:
- Eight worlds that split practice into manageable, motivating stages.
- Four game modes, so the same facts are trained in different ways and never get monotonous.
- No punishments. A wrong answer only means: we’ll see this fact again soon. No red flashing, no sad sounds, no lost lives.
- No ads, no data collection. What a child does in Droptiply stays on the device. For a tool aimed at children, that’s non-negotiable for us.
From conviction to app in the store
A list of convictions has become a finished product. What has stayed is the thought from the start: children rarely fail for lack of ability and often for lack of training. Droptiply trains that one thing – fast, reliable recall – and tries to stay out of its own way while doing it.