Comparison

Radiation Island vs Grimvalor

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

Head to head
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.

About

Grimvalor

Embark on a dark fantasy adventure as a lone warrior battling through a corrupted realm. Master skill-based combat, explore atmospheric landscapes, and face epic boss fights in this challenging hack and slash platformer. Restore the kingdom and uncover the fate of its lost king.

Highlights
  • Skill-based combat
  • Exploration of dark fantasy world
  • Epic boss fights
  • Stunning 3D visuals
  • Customizable touch controls
  • MFi controller support
  • Offline play
Features
Read full description

Slash your way through the hordes of darkness and defeat King Valor's fearsome guardians in this breathtaking adventure! "Chaining together a slick series of attacks, dodges, and jumps, is incredibly satisfying." — PocketGamer "I suspect mobile gaming fans will be playing and replaying this one for years to come." — TouchArcade, 5/5 A malicious power stirs in the forgotten kingdom of Vallaris. Tasked with discovering the fate of its lost king, your quest quickly takes a sinister turn and you are cast into darkness. Surrounded and outnumbered, you must grab your sword, steel your temper and fight your way through a land that does not welcome you. Except for the friendly merchant - he's grateful for your business. ABOUT THE GAME Grimvalor is a challenging hack & slash platformer with fast-paced combat in a dark fantasy world. Take control of a lone warrior on a quest to restore a corrupted realm. Embark on a journey through atmospheric landscapes and dungeons in a massive story-driven premium experience. COMBAT & EXPLORATION Master skill-based combat, learn enemy patterns and bring them down with all your fury. Explore the shattered lands of Vallaris, find and upgrade equipment and level up your character. Face the legacy of King Valor's madness and prevail! FEATURES • Epic boss fights • Stunning 3D visuals accelerated by Metal graphics • Accurate and customizable touch controls • Full support for MFi game controllers • Use iCloud to keep your saves in sync between devices. • Play offline - perfect for commute. • No ads or in-app purchases

Screenshots

Radiation Island4 screens
Grimvalor4 screens

Verdict

The call

The clearest difference is rating: Grimvalor at 4.9 against Radiation Island's 4.3. Grimvalor also leads on review sentiment (91% vs 74%) and ratings volume (9.8K vs 650). Radiation Island's advantage is update cadence (every 3 weeks vs every 2 months) and price ($4.99 vs $5.99). On ads, in-app purchases, monetization model 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

Radiation Island costs $4.99 and Grimvalor $5.99 up front. Neither carries in-app purchases, so what you see is what you pay.

ReceptionRating · Positive reviews · Number of ratings

Grimvalor holds the better App Store score, 4.9 against 4.3. That said, the two scores are not equally well evidenced: Grimvalor has 9.8K ratings behind it against 650, so its average is the more settled of the two. Written reviews point the same way: 74% of Radiation Island's written reviews are positive against 91% of Grimvalor's.

UpkeepUpdate frequency

Radiation Island ships an update every 3 weeks, Grimvalor every 2 months. The most recent releases landed on October 29, 2026 and October 30, 2026 respectively.

Scorecard6 real differences · 5 level
Radiation Island versus Grimvalor: the parameters behind the verdict, then further details
ParameterRadiation IslandGrimvalor
Price$4.99 — better$5.99
Rating4.3 (650 ratings)4.9 (9.8K ratings) — better
Positive reviews73.9% of reviews90.8% of reviews — better
Number of ratings6509.8K — better
Update frequencyEvery 3 weeks — betterEvery 2 months
AdsNoNo
In-app purchasesNoNo
MonetizationPaidPaid
Best chart rank—#98 — better
DevicesiPhone, iPad, iPodiPhone, iPad, iPod
Requires iOS1514.0 — better
Further details — not scored
Size2.3 GB739 MB
Age rating12+12+
DeveloperAtypical GamesDirelight

Customer experience

Radiation Island

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

Grimvalor

All ratings9,754 ratings
Positive97.2%
Neutral1.4%
Negative1.4%
Written reviews804 reviews
Positive90.8%
Neutral3.2%
Negative6.0%

User reviews

Radiation Island

From 650 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

Grimvalor

From 9.8K App Store ratings

What we love

  • 🚀 Smooth gameplay
  • 👍 Excellent controls
  • 🎨 Beautiful graphics
  • 🎶 Great soundtrack
  • 💰 Worth the price

Room to improve

  • 🐛 Occasional bugs and crashes
  • 🕹️ Challenging difficulty spikes
  • 🕹️ Frustrating jumping puzzles
  • 🕹️ Dodge mechanic issues
  • 🔍 Lack of character customization

Bugs and requests

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

Grimvalor

Reported bugs

4 issues
  • Dodge not registering properly
  • Crashes in New Game Plus
  • Companion AI issues
  • Graphical glitches on older devices

Requested features

5 requests
  • More levels and content
  • Ability to replay bosses
  • Enemy scaling for higher difficulties
  • Expanded weapon and trinket selection
  • New game plus improvements

In-app purchases

None

Radiation Island

No in-app purchases

None

Grimvalor

No in-app purchases

Questions

Is Radiation Island free?
Radiation Island costs $4.99, with no in-app purchases.
Is Grimvalor free?
Grimvalor costs $5.99, with no in-app purchases.
Which has better reviews, Radiation Island or Grimvalor?
Grimvalor is rated higher. Radiation Island averages 4.3 out of 5 from 650 ratings, while Grimvalor averages 4.9 from 9.8K ratings.
Do Radiation Island or Grimvalor have ads?
Neither Radiation Island nor Grimvalor shows ads.
Which is updated more often, Radiation Island or Grimvalor?
Radiation Island ships an update every 3 weeks, and Grimvalor every 2 months. Most recently, Radiation Island was updated on October 29, 2026 and Grimvalor on October 30, 2026.

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