Radiation Island vs Grimvalor
Price, ratings, monetisation and update history for both games, side by side — with what reviewers say about each.
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.
- Open-world exploration
- Crafting and resource gathering
- Combat against wildlife and zombies
- Day-night cycle and weather effects
- Underwater exploration
- Multiplayer arena mode
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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.
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.
- Skill-based combat
- Exploration of dark fantasy world
- Epic boss fights
- Stunning 3D visuals
- Customizable touch controls
- MFi controller support
- Offline play
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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
Verdict
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
Radiation Island costs $4.99 and Grimvalor $5.99 up front. Neither carries in-app purchases, so what you see is what you pay.
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.
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.
| Parameter | Radiation Island | Grimvalor |
|---|---|---|
| Price | $4.99 — better | $5.99 |
| Rating | 4.3 (650 ratings) | 4.9 (9.8K ratings) — better |
| Positive reviews | 73.9% of reviews | 90.8% of reviews — better |
| Number of ratings | 650 | 9.8K — better |
| Update frequency | Every 3 weeks — better | Every 2 months |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Paid | Paid |
| Best chart rank | — | #98 — better |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Requires iOS | 15 | 14.0 — better |
| Further details — not scored | ||
| Size | 2.3 GB | 739 MB |
| Age rating | 12+ | 12+ |
| Developer | Atypical Games | Direlight |
Customer experience
Radiation Island
Grimvalor
User reviews
Radiation Island
From 650 App Store ratingsWhat 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 ratingsWhat 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
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- 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
Radiation Island
No in-app purchases
Grimvalor
No in-app purchases








