Comparison

Unfoldit vs Shells

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

Head to head
About

Unfoldit

This app offers a unique puzzle experience where you visualize folding paper and predicting where holes will appear. It's designed to sharpen spatial reasoning, memory, and logic skills through over 1,800 levels. Enjoy brain training that fits into your day, with progress tracking and offline play.

Highlights
  • Visualize paper folds and hole punches
  • 1,885+ handcrafted levels
  • Hints and step-by-step animations
  • Strengthen focus and memory
  • Track stats for accuracy and speed
  • Offline play
  • iCloud sync across devices
Features
Read full description

BOOST YOUR BRAINPOWER WITH EVERY FOLD & PUNCH. Sharpen your spatial reasoning, short-term memory, and logic skills — one puzzle at a time. Unfoldit is the original brain training game of paper folding and hole punching, inspired by real cognitive assessments and enjoyed by thousands around the world. BRILLIANT VISUAL PUZZLES THAT WORK YOUR MIND. • Visualize folds and mentally unfold them to predict hole punches across 1,885+ handcrafted levels • Start easy and progress through expert-level puzzles with precision • Learn as you go — hints and step-by-step unfolding animations guide you • Strengthen focus, memory, and cognitive flexibility with each puzzle BASED ON REAL COGNITIVE SCIENCE. • Modeled after spatial reasoning and visual memory tests used in academia, research, and admissions • Gameplay designed to challenge and enhance short-term memory and attention • Used by students, professionals, and puzzle lovers alike TAP IT, UNFOLD IT, WIN IT. • Short levels are perfect for those in-between moments throughout your day • Play hundreds of free levels — no ads, no distractions BUILT FOR PLAY — AND FOR PROGRESS. • Track your stats for each level — accuracy, speed, and precision • Personalize your experience with light/dark mode and gameplay settings • Play offline anytime — on flights, subways, or in short breaks INTEGRATED WITH YOUR LIFE. • Sync progress and stats automatically with iCloud across iPhone, iPad, and Mac • Set optional daily reminders for encouragement to build a brain-training habit • Share level links with friends to challenge them to solve what you’ve mastered • Use Handoff to continue levels between devices for seamless gameplay • Use Siri Shortcuts to jump back into your next level instantly AWARD-WINNING & FEATURE-RICH. Unfoldit was a finalist in the 2019 Georgia Tech InVenture Prize invention competition. It's been refined for thoughtful minds, clever thinkers, and everyday geniuses. UNFOLD YOUR MIND. START TRAINING TODAY. Download Unfoldit now and join a global community of players improving their minds one fold at a time.

About

Shells

A geometry puzzle game where you slide blocks into larger shells to rearrange the board and solve challenges. It offers over 360 levels across 8 worlds with a focus on spatial reasoning and problem-solving. Enjoy a relaxing experience with a soothing soundtrack.

Highlights
  • Nested block sliding mechanics
  • Over 360 original levels
  • 8 distinct game worlds
  • Optional hint system
  • Soothing piano soundtrack
  • Compact 4x4 grid gameplay
Read full description

Shells is a geometry puzzle game about the elegance of nested pieces on a tiny board. Slide your block into larger shells to rearrange the board and find your way out! Features: - Simple core mechanics and deep emergent complexity packed into a compact 4x4 grid. Train your brain by challenging your problem solving and spatial reasoning skills! - Gradual difficulty curve featuring over 360 original levels spread across 8 distinct worlds. - Flexible progression structure with multiple levels to choose from at any given point. - Adjust the difficulty to your liking with the optional hint system! - Soothing piano soundtrack accompanied by relaxing sound effects and backgrounds.

Screenshots

Unfoldit4 screens
Shells4 screens

Verdict

The call

The clearest difference is ads: Unfoldit at none against Shells's shown. Unfoldit also leads on ratings volume (606 vs 22). Shells's advantage is update cadence (weekly vs every 3 weeks). On price, rating, review sentiment and in-app purchases 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. Unfoldit sells 7 one-off in-app purchases and Shells sells 4 one-off in-app purchases. Whichever you choose, the download price is not the number that matters.

ReceptionRating · Positive reviews · Number of ratings

On the App Store both sit at effectively the same score — 4.9 for Unfoldit against 5.0 for Shells. That said, the two scores are not equally well evidenced: Unfoldit has 606 ratings behind it against 22, so its average is the more settled of the two. Written reviews are what separate them: 98% of Unfoldit's written reviews are positive against 100% of Shells's.

UpkeepUpdate frequency

Unfoldit ships an update every 3 weeks, Shells weekly. Both last shipped on October 24, 2026.

Scorecard3 real differences · 7 level
Unfoldit versus Shells: the parameters behind the verdict, then further details
ParameterUnfolditShells
PriceFreeFree
Rating4.9 (606 ratings)5.0 (22 ratings) — better
Positive reviews98.4% of reviews100.0% of reviews — better
Number of ratings606 — better22
Update frequencyEvery 3 weeksWeekly — better
AdsNo — betterYes
In-app purchasesYesYes
MonetizationFree with in-app purchasesFree with in-app purchases
DevicesiPhone, iPad, iPodiPhone, iPad, iPod
Requires iOS13.012.0 — better
Further details — not scored
Size9 MB102 MB
Age rating4+4+
DeveloperErudite Apps LLCarlybird games LLC

Customer experience

Unfoldit

All ratings510 ratings
Positive98.4%
Neutral1.0%
Negative0.6%
Written reviews61 reviews
Positive98.4%
Neutral0.0%
Negative1.6%

Shells

All ratings22 ratings
Positive100.0%
Neutral0.0%
Negative0.0%
Written reviews11 reviews
Positive100.0%
Neutral0.0%
Negative0.0%

Bugs and requests

Unfoldit

Reported bugs

2 issues
  • Difficulty differentiating old and new holes in some levels
  • Occasional freezing or crashing on certain devices

Requested features

3 requests
  • More advanced/difficult levels
  • Ability to track progress and achievements
  • Multiplayer or competitive modes

Shells

Not enough reviews yet to summarise bugs or requests.

In-app purchases

7 purchases

Unfoldit

One-time7
  • Medium Levels$0.99
  • Tiny Hint Pack$0.99
  • Hard Levels$1.99
Show 4 more
  • Expert Levels$2.99
  • Small Hint Pack$3.99
  • Grande Hint Pack$9.99
  • Ream Master Hint Pack$19.99
4 purchases

Shells

One-time4
  • Small Bundle$0.99
  • Medium Bundle$1.99
  • Large Bundle$3.99
Show 1 more
  • Unlimited Bundle$8.99

Questions

Is Unfoldit free?
Unfoldit is free to download, with in-app purchases available.
Is Shells free?
Shells is free to download, with in-app purchases available.
Which has better reviews, Unfoldit or Shells?
Shells is rated higher. Unfoldit averages 4.9 out of 5 from 606 ratings, while Shells averages 5.0 from 22 ratings.
Do Unfoldit or Shells have ads?
Shells shows ads; Unfoldit does not.
Which is updated more often, Unfoldit or Shells?
Unfoldit ships an update every 3 weeks, and Shells weekly. Most recently, Unfoldit was updated on October 24, 2026 and Shells on October 24, 2026.

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