Before a child learns to read, almost everything they know came in through listening — you talking to them, stories read aloud, songs, conversations they overheard. Reading comes later and builds on top of that listening foundation. So it's a little strange how many "educational" apps for young kids are just walls of text with a picture next to them, expecting a 4 year old to somehow decode it.
This sounds obvious once you say it out loud, but it's worth stating plainly: an app full of written instructions is only useful to a child who can already read those instructions. For a Nursery or KG-age child, that rules out most of what's on the app store, no matter how colorful the interface is.
Voice narration removes that barrier entirely. The child doesn't need to decode anything — they just listen, the same way they'd listen to a parent or teacher, and the lesson happens naturally.
A child who only ever sees the written word "elephant" might eventually recognize the shape of the word without ever learning to say it correctly. Hearing it spoken clearly, ideally a few times, builds the actual pronunciation alongside the recognition — which matters a lot more at this age than being able to spell it.
Young children need a lot of repetition to actually retain new words — far more than adults assume. Reading the same written word five times in a row is boring even for an adult. Hearing it spoken with a bit of warmth and variation in tone, especially paired with a "repeat after me" moment, keeps that same repetition from feeling like a chore.
Spoken lessons also make it much easier to weave in two languages — hearing a word in English, then hearing the same idea explained in Urdu, mirrors exactly how bilingual children already absorb language day to day. A purely text-based app has to awkwardly show both languages side by side; a voice can just switch naturally mid-explanation.
If you're evaluating any learning app for a child who isn't reading fluently yet, this is really the first question worth asking: does it talk to my child, or does it just expect them to already know how to read? That one detail predicts most of whether the app will actually get used.