Comparison

Junk Jack vs Radiation Island

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

Head to head
About

Junk Jack

Explore, build, and survive in procedurally generated 2D worlds. This sandbox adventure offers creative building, combat, and exploration across multiple planets, with options for both single-player and multiplayer experiences.

Highlights
  • Procedurally generated worlds
  • Multiplayer support
  • Creative mode
  • Extensive equipment system
  • Adventure mode across multiple planets
  • Electronics engine for complex creations
  • Farming system
Features
Read full description

Welcome to Junk Jack! It is a 2D sandbox where you can explore, build and survive in randomly generated procedural worlds, full of monsters, hidden treasures and beautiful landscapes, now even in multiplayer with friends! * Chosen by the AppStore as one of the #BestOf2013 crafting games in 9 countries! * We are glad to deliver you the best Junk Jack experience ever imagined! A sequel which brings the game to a whole new level with multiplayer, multiple planets, creative mode, liquids, plenty of equipment to customize your character and much more! Plus all the features you loved from Junk Jack Retro (and, we hope, less features you hated!) This is not a freemium game, buy it once and enjoy the full game experience! Features: - local multiplayer up to 4 players and online multiplayer up to 2 players - a creative mode to unleash your creativity and build everything you can imagine - a fully featured equip system with more than 400 different wearable items to enhance your adventures or just to make your friends envy! - polished pixel graphics, full retina support - combat Uber Mobs and obtain their loot by destroying rare world altars! - a fully fledged electronics engine allows the creation of complex widgets, even complete CPUs! - tenths of wonderful music tracks by Bright Primate - intuitive controls: swipe to move and tap to interact with everything - an adventure mode that will let you travel between 12 multiple planets with different and intriguing environments - liquids to enhance or impede your explorations: avoid dangerous lava or go for a swim in a surface lake! - infinite procedurally generated worlds to make every adventure always different - a dynamic day/night cycle that blends with wonderful skies in parallax - a vibrant coloured lighting engine that will make you enjoy every minute spent in Junk Jack worlds - character customization, you can play also as a female! - a rewarding exploration thanks to treasure chests full of cool things - tamable dogs, cats and many other animals that will follow you around - more than 1000 crafts to be built - more than 2000 treasures - more than 440 placeable items - more than 270 different creatures and monsters - explosives, shelves, signs, dyes and all the features you liked in Junk Jack Retro - a complete farming system with more than 70 plants, even many alien and exotic plants - an in game guide that will teach you how to play - two ways of crafting to accommodate even needs of casual users This is just the beginning, we already have many ideas for the next updates! For every issue just contact us on our forum at forum.pixbits.com

About

Radiation Island

Embark on a survival adventure in a vast open world, stranded in an alternate reality. Explore, craft, and fight to uncover secrets and find your way back home. Survive harsh environments, dangerous creatures, and the undead.

Highlights
  • Open-world exploration
  • Crafting and resource gathering
  • Combat against wildlife and zombies
  • Day-night cycle and weather effects
  • Underwater exploration
  • Multiplayer arena mode
Features
Read full description

Radiation Island is a survival adventure game where you craft your own destiny in a huge open world environment. As part of the Philadelphia Experiment you have become stranded in a parallel, alternate reality. Discover this new and mysterious world, with all its surprises. Use everything you find to survive it and solve its puzzle to get back to the real world. Follow your own path in an environment of breathtaking beauty and gigantic scope. Explore huge forests inhabited by dangerous wolves, bears and mountain lions. Investigate abandoned villages and old military compounds where zombies guard vital tools, weapons and clues to the secrets of this world. You can even swim and dive, if you can avoid the hungry crocodiles. Hunt wild animals, fish or gather fruits to overcome hunger. Mine for resources and craft weapons, tools and basic vehicles. Find hidden treasures, equipment and fire arms to prevail in a world full of perils: radiation, anomalies, harsh weather and enraged zombies. Experience the full day-night cycle and face the dangers of darkness and cold. Survive and beat the game to unlock multiplayer mode: fight other real players online in a closed arena for valuable resources. AMAZING QUALITY, AND IT’S ONLY ON iOS! Optimized for the iPhone 6 and 6 Plus and the new A8 processors with greater environmental detail, spectacular visual effects and unparalleled performance! Takes advantage of Metal on A7 and A8 devices to provide cutting edge graphics. GAME CENTER, AirPlay and iCloud iCloud support is integrated so players can save and share progress across devices. AirPlay lets you play the game on larger displays via Apple TV. Climb the Game Center leaderboards, challenge friends and unlock dozens of achievements. Supports iOS MFi Game Controllers. Important: iPhone 4 and older devices are not supported.

Screenshots

Junk Jack4 screens
Radiation Island4 screens

Verdict

The call

The clearest difference is in-app purchases: Radiation Island at none against Junk Jack's 11. Radiation Island also leads on update cadence (every 3 weeks vs every 3 months). Junk Jack's advantage is iOS requirement (9.0 vs 15). On price, rating, review sentiment and ratings volume 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

Junk Jack costs $4.99 and Radiation Island $4.99 up front. Junk Jack sells 11 one-off in-app purchases. Radiation Island asks for nothing beyond the download.

ReceptionRating · Positive reviews · Number of ratings

On the App Store both sit at effectively the same score — 4.4 for Junk Jack against 4.3 for Radiation Island. Both are backed by a comparable volume of ratings — 471 and 649 respectively. Written reviews are what separate them: 78% of Junk Jack's written reviews are positive against 74% of Radiation Island's.

UpkeepUpdate frequency

Junk Jack ships an update every 3 months, Radiation Island every 3 weeks. Both last shipped on September 25, 2026.

Scorecard3 real differences · 7 level
Junk Jack versus Radiation Island: the parameters behind the verdict, then further details
ParameterJunk JackRadiation Island
Price$4.99$4.99
Rating4.4 (471 ratings) — better4.3 (649 ratings)
Positive reviews78.0% of reviews — better73.9% of reviews
Number of ratings471649 — better
Update frequencyEvery 3 monthsEvery 3 weeks — better
AdsNoNo
In-app purchasesYesNo — better
MonetizationPaidPaid
DevicesiPhone, iPad, iPodiPhone, iPad, iPod
Requires iOS9.0 — better15
Further details — not scored
Size67 MB2.3 GB
Age rating4+12+
DeveloperPixbits SRLAtypical Games

Customer experience

Junk Jack

All ratings471 ratings
Positive82.8%
Neutral5.7%
Negative11.5%
Written reviews764 reviews
Positive78.0%
Neutral6.4%
Negative15.6%

Radiation Island

All ratings649 ratings
Positive82.1%
Neutral5.4%
Negative12.5%
Written reviews1,173 reviews
Positive73.9%
Neutral8.0%
Negative18.1%

User reviews

Junk Jack

From 471 App Store ratings

What we love

  • 🚀 Awesome game
  • 🚀 Great sandbox experience
  • 🚀 Tons of content
  • 🚀 Nostalgic
  • 🚀 Addictive gameplay

Room to improve

  • 🐛 Crashes and glitches
  • 🐛 Multiplayer issues
  • 🐛 Inventory/crafting bugs
  • 🔋 Performance issues on older devices
  • 🔒 Lack of cloud/cross-device save support

Radiation Island

From 649 App Store ratings

What we love

  • 🚀 PLEASE KEEP UPDATING
  • 👍 Enjoyable for years
  • 👍 Immersive environment
  • 👍 Tense atmosphere
  • 👍 Open world with variety

Room to improve

  • 🐛 Crashes and resets progress
  • 🐛 Glitches with building
  • 🐛 Laggy performance in certain areas
  • 🔋 Battery draining
  • 🐛 Disappearing items and chests

Bugs and requests

Junk Jack

Reported bugs

5 issues
  • Crashes when joining multiplayer
  • Inventory items disappearing
  • Crafting recipes not working
  • Compatibility issues with newer iOS versions
  • Multiplayer desync and desyncing

Requested features

5 requests
  • Controller support
  • More planets/biomes
  • NPC/civilization features
  • Expanded crafting/progression
  • Taming/breeding mechanics

Radiation Island

Reported bugs

5 issues
  • Crashes causing loss of progress
  • Glitches with building and structures
  • Disappearing items and chests
  • Laggy performance in certain areas
  • Compatibility issues with newer iOS versions

Requested features

8 requests
  • Creative mode with unlimited resources
  • Multiplayer co-op
  • More vehicles (cars, boats, etc.)
  • Expanded crafting and building options
  • More enemy variety and difficulty
Show 3 more
  • Additional weapons (grenades, flamethrowers, etc.)
  • Weather effects (rain, storms, etc.)
  • Ability to tame animals as companions

In-app purchases

11 purchases

Junk Jack

One-time11
  • Breeding Hat$0.99
  • Extended Day$0.99
  • Complete Craftbook$0.99
Show 8 more
  • Dark Ninja$0.99
  • Mining Helmet$0.99
  • Hatcher Hat$0.99
  • Santa Hat$0.99
  • Chemistry Book$0.99
  • Pocket Pug$0.99
  • Legendary Pole$0.99
  • Instant Planets$1.99
None

Radiation Island

No in-app purchases

Questions

Is Junk Jack free?
Junk Jack costs $4.99, and also offers in-app purchases.
Is Radiation Island free?
Radiation Island costs $4.99, with no in-app purchases.
Which has better reviews, Junk Jack or Radiation Island?
Junk Jack is rated higher. Junk Jack averages 4.4 out of 5 from 471 ratings, while Radiation Island averages 4.3 from 649 ratings.
Do Junk Jack or Radiation Island have ads?
Neither Junk Jack nor Radiation Island shows ads.
Which is updated more often, Junk Jack or Radiation Island?
Junk Jack ships an update every 3 months, and Radiation Island every 3 weeks. Most recently, Junk Jack was updated on September 25, 2026 and Radiation Island on September 25, 2026.

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