Yes. No card needed to start. For the first 3 days after sign-up, AI pronunciation checks and AI chat are unlimited. From day 4 on, you get 5 pronunciation checks and 3 AI chats a day, 3 learning categories, and 2 walk locations, free with no time limit. Subscribe only if you want more.

Will I be charged automatically when the 3 days end?

No. The 3-day trial never asks for card details, so there's nothing to charge. When it ends, you simply move to the free plan. You're only charged if you choose to subscribe through the App Store or Google Play.

Is my child's voice recorded and stored?

No. Your child's voice is deleted immediately after pronunciation scoring. It's never saved separately or used for any other purpose.

How is this different from YouTube or other English apps?

A video platform like YouTube keeps kids engaged with ads and a recommendation algorithm; DdungNyang has no ads and a bounded set of learning content. Scoring pronunciation down to individual phonemes is also a real difference from typical English-learning apps.

What devices does it work on?

Both iOS (iPhone, iPad) and Android. Download it from the App Store or Google Play.

How do I cancel my subscription?

Cancel anytime from your App Store or Google Play subscription settings. You keep access through the end of the period you already paid for.

Parent mode sits behind a guardian gate (a simple math question). Inside, you can see what your child learned today and how their pronunciation score is trending — included in the subscription, no extra payment.

None at all — no banners, no popups, no rewarded ads, and no third-party ad tracking.

Built by an English-teacher dad, for his daughter

10 minutes a day.English becomes playtime with her cat teacher.

Chubby Cat Teacher is an AI English pronunciation and conversation learning app for children ages 4-10.

5,000 words · 7,400 sentences · AI scores every single sound.

Download on theApp Store

Get it onGoogle Play

Scan to install on your phone

Start free, no card required · Unlimited AI pronunciation & chat for the first 3 days · free daily learning after that

Built by an English-teacher dad, for his daughter

No ads
Free daily learning
5 languages
Parent dashboard (guardian-gated)
Voice deleted right after scoring

How it works

A 10-minute English habit, in 4 steps

Speak
Say today's sentence out loud.
AI scores pronunciation
Scored in real time, down to individual phonemes.
Treat DdungNyang
Spend the points you earn on snacks and toys, and level up together.
Parent report
Parents check what was learned today.

Core Features

What she actually uses every day

Refined with her every day for over six months. Only what kids actually need stayed.

Core Features

AI scores pronunciation

AI listens to your child's pronunciation in real time and analyzes it phoneme by phoneme — telling you exactly which sound needs work.

Phoneme-level accuracy
Real-time feedback
A pronunciation report

Core Features

Discover words on an 18-spot walk

From the park to outer space — see a picture, name the word, and it's saved to the vocabulary journal automatically.

18 places to explore
Picture-to-word matching
Auto-saved journal

Core Features

Chat with DdungNyang in English

Press the mic and speak. DdungNyang chats back at a child's level, every time.

AI voice conversation
Kid-level responses
3 free chats a day

Core Features

Earn points, spoil DdungNyang

Every lesson earns points. Spend them in the shop on snacks, toys, and outfits for DdungNyang, and watch the cat grow.

Earn points by studying
Buy snacks, toys & outfits
Lv1 → Lv10 growth

And more

Vocabulary Journal

Themed word collections

Word Order Puzzle

Word order through play

Paw-Print Streak

Daily study calendar

Trophies & Shop

Collect and customize

The in-app story

On a rainy day, a small bond began

The in-app story 01

A small cat, met in the rain

On a rainy evening, a child found a small cat curled up on the street. They couldn't just walk by.

The in-app story 02

First meal at our home

After one warm bowl of rice, the cat became part of the family that very day. It seemed to want to repay the kindness.

The in-app story 03

Studying English every night

While the family slept, the cat secretly began studying English — to teach the family in return.

When she learns, DdungNyang grows.

How-to video

See how it works in about a minute

A short video showing the core flow.

Start with the story
The app opens with the story of a small cat met on a rainy day.
Take care of DdungNyang
Feed and play with the cat to get to know it.
Practice a sentence
Say today's sentence out loud and AI scores your pronunciation.
Walk and find words
Explore 18 locations, matching pictures to words as you go.
Check parent mode
After the guardian gate, review today's learning report.
Build the habit
The word journal, trophies, and paw-print calendar add up day by day.

Who made this

Made by a dad who's taught English for 15+ years, for his daughter

I've taught English for more than 15 years, and I started this app while helping my daughter with her English back when she was in kindergarten. She used it every day, found the bugs, told me what to fix, and the next morning she'd ask, "Did you fix what I told you yesterday?" Honestly, we built it together. Over the months it took to get right, she started elementary school, and because she loves the cat, she's usually the one asking to study.

— The dad who made DdungNyang

The real DdungNyang

DdungNyang is a real street cat

The character is based on a street cat who lives in our neighborhood. We call her DdungNyang because she's, well, chubby (my daughter has her own name for her). She's as friendly as a dog, loves being petted, and my daughter adores her.

The neighborhood street cat curled up on a cushion — Chubby, hence the name

The cat lying on the pavement, looking up at the camera — Doesn't exactly look like an English teacher, but she's cute, so we'll allow it

The cat eating a treat from a child's hand — Never says no to a treat

The cat lying belly-up while a child pets her — Loves a good belly rub

For Parents

Designed so parents can relax

No ads, no third-party ad tracking. A safe environment we designed ourselves.

Built for my own student — my daughter.

Parent dashboard

See what your child learned today and how long they studied. Share progress and streaks together.

Zero ads

No ads of any kind. No banners, no popups, no rewarded ads to break your child's focus.

Children's privacy

COPPA compliant for users under 13. Your child's data is used only to improve their learning.

Zero third-party ad tracking

No third-party ad trackers. Your child's activity data is never shared externally for advertising.

DdungNyang, by the numbers

5,000+

words

7,400+

sentences

One simple plan

All features in one subscription. Parent mode is included — no extra purchase.

Less than a daily coffee

Try it properly before you pay

All of this is free, no card needed

First 3 days after sign-up

Unlimited AI pronunciation checks & AI chat
8 learning categories (5 as previews)
5 walk locations
2.5x faster cat growth

From day 4, with no time limit

5 AI pronunciation checks a day
3 AI chats a day
3 learning categories
2 walk locations

Nothing is charged when the 3 days end. You only pay if you choose to subscribe in the store.

Monthly

$6.99/ mo

Unlimited AI pronunciation
Cat care & growth (Lv1–Lv10)
18 walk-mode locations & AI chat
Parent mode included

Get Started Now

Download it now

Start free with no card, and use AI pronunciation and chat as much as you like for 3 days.

Download on theApp Store

Get it onGoogle Play

FAQ

Common questions

We answered the ones we get most often.

Best fit for children ages 5–10 who can read their native language. Because a kindergarten-to-first-grade girl shaped it daily, the experience is calibrated to that age range.

Download the app

The street-cat teacher she helped build

Ten minutes a day is all it takes. Start your child's first lesson tonight.

Download on theApp Store

Get it onGoogle Play

Start free, no card required · Unlimited AI pronunciation & chat for the first 3 days · free daily learning after that

10 minutes a day.English becomes playtime with her cat teacher.

A 10-minute English habit, in 4 steps

Speak

AI scores pronunciation

Treat DdungNyang

Parent report

What she actually uses every day

AI scores pronunciation

Discover words on an 18-spot walk

Chat with DdungNyang in English

Earn points, spoil DdungNyang

Vocabulary Journal

Word Order Puzzle

Paw-Print Streak

Trophies & Shop

On a rainy day, a small bond began

A small cat, met in the rain

First meal at our home

Studying English every night

See how it works in about a minute

Start with the story

Take care of DdungNyang

Practice a sentence

Walk and find words

Check parent mode

Build the habit

Made by a dad who's taught English for 15+ years, for his daughter

DdungNyang is a real street cat

Designed so parents can relax

Parent dashboard

Zero ads

Children's privacy

Zero third-party ad tracking

One simple plan

All of this is free, no card needed

Download it now

Common questions

The street-cat teacher she helped build