Kid vs PhD Challenge
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Kid
Explore a multi-story house filled with interactive rooms and hidden surprises. Dress up adorable kittens, create stories, and record your own animated cartoons to share.
- Interactive rooms with hidden surprises
- Dress-up for kittens
- Story creation tools
- Cartoon recording and sharing
- Offline play
- Easy controls for young children
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Welcome to the kitten’s house! We’ve built you four floors of fun – Daddy’s Office, the Kittens' Bedroom, the Kitchen, the Living Room, Mommy’s Office, the Basement, the Attic Exercise Room, and more – where you can play and have fun with your favorite characters. Look closely! Every room is full of hidden surprises. Peek in the closet and the dresser, the refrigerator and the pantry. You can investigate anything you want. Dress the kittens in different outfits, think of games and stories for them... and record your own cartoons and share them with friends. Features and capabilities: • easy controls for the youngest fans; • stimulates children’s imagination and helps them learn; • works offline – no internet connection required
PhD Challenge
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PhD Challenge is a quiz game that takes you from elementary school all the way to a PhD. · 18 academic levels — Elementary, Middle School, High School, Undergraduate, Master's, and PhD — unlocked one by one · 6 graduation diplomas — 6th grade, 9th grade, 12th grade, senior year, Master's, and PhD. Pass each graduation exam to add the diploma to your Certificate Wall · Ability profile — see how you score across logical reasoning, data analysis, natural science, general knowledge and more, with an instant post-exam ability chart · Real exam conditions — each question has its own countdown (45–90 seconds); answers lock on submit and show an explanation, you can't go back, and the timer keeps running in the background · Fair retake system — 5 free attempts per level; once they're used, complete 8 hours of self-study to earn one free retake · Retake tickets — don't want to wait? Buy retake tickets for an instant retry, or get unlimited retakes forever · Stratified random questions — every exam draws a different mix, so memorizing answers won't get you through · Five languages: Simplified Chinese, Traditional Chinese, English, Japanese, and Korean · Fully playable offline; your progress is saved automatically on your device Are you really at an elementary level — or can you go all the way to a PhD? Start your academic journey now.
Screenshots
Verdict
The clearest difference is ads: PhD Challenge at none against Kid's shown. Kid's advantage is iOS requirement (15.0 vs 17.0). On price, update cadence, in-app purchases and device support there is nothing between them.
Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS
Both are free to download. Kid sells 12 one-off in-app purchases and PhD Challenge sells 3 one-off in-app purchases. Whichever you choose, the download price is not the number that matters.
Kid ships an update fortnightly, PhD Challenge every 3 weeks. The most recent releases landed on October 29, 2026 and October 21, 2026 respectively.
| Parameter | Kid | PhD Challenge |
|---|---|---|
| Price | Free | Free |
| Rating | 4.5 (1.4K ratings) — better | — |
| Positive reviews | 60.6% of reviews | — |
| Number of ratings | 1.4K — better | — |
| Update frequency | Fortnightly — better | Every 3 weeks |
| Ads | Yes | No — better |
| In-app purchases | Yes | Yes |
| Monetization | Free with in-app purchases | — |
| Devices | iPhone, iPad, iPod — better | iPhone, iPad |
| Requires iOS | 15.0 — better | 17.0 |
| Further details — not scored | ||
| Size | 293 MB | 37 MB |
| Age rating | 4+ | 4+ |
| Developer | CLEAR INVEST LTD | 智慧 吴 |
Bugs and requests
Kid
Reported bugs
3 issues- Rooms losing power/lights
- Inability to refresh the house
- Inconsistent unlocking of features
Requested features
4 requests- Make the game completely free
- Add more playable characters and locations
- Improve stability and fix bugs
- Expand the gameplay beyond the house
PhD Challenge
Not enough reviews yet to summarise bugs or requests.
In-app purchases
Kid
- Factory$1.99
- Cafe$1.99
- Airport$1.99
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- Car Service$1.99
- Chase House$1.99
- Hotel$1.99
- Boris House$1.99
- Cupcake House$1.99
- Supermarket$1.99
- Restaurant$1.99
- The Cats House2 variants$2.99
- Full version$14.99
PhD Challenge
- 1 Retake Ticket$0.99
- 5 Retake Tickets$2.99
- Unlimited Retakes$9.99









