Comparison

Kid vs PhD Challenge

Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.

Head to head
About

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.

Highlights
  • Interactive rooms with hidden surprises
  • Dress-up for kittens
  • Story creation tools
  • Cartoon recording and sharing
  • Offline play
  • Easy controls for young children
Read full description

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

About

PhD Challenge

Features
Read full description

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

Kid4 screens
PhD Challenge4 screens

Verdict

The call

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

CostPrice · In-app purchases · Ads · Monetization

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.

UpkeepUpdate frequency

Kid ships an update fortnightly, PhD Challenge every 3 weeks. The most recent releases landed on October 29, 2026 and October 21, 2026 respectively.

Scorecard2 real differences · 8 level
Kid versus PhD Challenge: the parameters behind the verdict, then further details
ParameterKidPhD Challenge
PriceFreeFree
Rating4.5 (1.4K ratings) — better—
Positive reviews60.6% of reviews—
Number of ratings1.4K — better—
Update frequencyFortnightly — betterEvery 3 weeks
AdsYesNo — better
In-app purchasesYesYes
MonetizationFree with in-app purchases—
DevicesiPhone, iPad, iPod — betteriPhone, iPad
Requires iOS15.0 — better17.0
Further details — not scored
Size293 MB37 MB
Age rating4+4+
DeveloperCLEAR 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

12 purchases

Kid

One-time12
  • Factory$1.99
  • Cafe$1.99
  • Airport$1.99
Show 9 more
  • 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
3 purchases

PhD Challenge

One-time3
  • 1 Retake Ticket$0.99
  • 5 Retake Tickets$2.99
  • Unlimited Retakes$9.99

Questions

Is Kid free?
Kid is free to download, with in-app purchases available.
Is PhD Challenge free?
PhD Challenge is free to download, with in-app purchases available.
Do Kid or PhD Challenge have ads?
Kid shows ads; PhD Challenge does not.
Which is updated more often, Kid or PhD Challenge?
Kid ships an update fortnightly, and PhD Challenge every 3 weeks. Most recently, Kid was updated on October 29, 2026 and PhD Challenge on October 21, 2026.

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