Comparison

Idle Defense Octopus Evolution vs Grim Defender

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

Head to head
About

Idle Defense Octopus Evolution

Evolve a mutant octopus by collecting DNA and gems to unlock new arms and super weapons. Defend against enemies with easy-to-learn touch controls and enjoy cartoon graphics with rock music. Share your progress and discover new features in this unique tower defense experience.

Highlights
  • Evolve mutant octopus with new arms and weapons
  • Easy touch-and-hold gameplay
  • Cartoon graphics and rock music
  • Unlock shark, dragon, and other arms
  • Utilize frozen, armor, and nuclear weapons
  • Share game records on social media
Features
Read full description

▶▶▶ WATCH Funny Gameplay Video - Starring Oczilla - by FGTeeV: https://bit.ly/oczilla-youtube ▶▶ How to Play: ● Touch & hold on left or right side of the screen to rotate the octopus. ● Use octopus's arms to destroy enemies. ● Use collected DNA, gems and eggs to evolve your mutant octopus. ▶▶ Features: ● Very easy gameplay. ● Cool rock music. ● Beautiful & cute cartoon graphics. ● Many octopus arms: shark, turtle, lobster, elephant, porcupine, dragon... ● Super weapons: frozen, armor, nuclear. ● Share your game record on Facebook, Twitter... ● And many more features waiting for you to discover! ▶▶ Tips: ● Tap on the penguin at home screen to watch the game story (please wait for 5 seconds for him to appear, he has to make up). ● Turning on/off music will also change music type, we have 2 types: rock and relaxing. ● Tap on the flying star bubble at home screen to rate this game. If you love games like tower defense or idle defense games..., this "Oczilla - The Mutant Octopus" game is just for you. Enjoy this awesome tower defence game with brand new unique gameplay! Alright! Happy playing! And don't play too much! Thanks & best regards. == Follow Us == ● Facebook: https://facebook.com/OcsagaStudio ● Twitter: https://twitter.com/OcsagaStudio ● Website: https://ocsaga.com ● Support: us@ocsaga.com

About

Grim Defender

Engage in fast-paced castle defense with strategic upgrades and skill. Defend your base against endless monster waves, gather resources, and combine a vast array of weapons, spells, and traps to become stronger. Compete with others and play offline.

Highlights
  • Upgrade and defend your castle
  • Defend against endless monster waves
  • Gather resources and improve defenses
  • Equip and combine crossbows, spells, and traps
  • Offline play capability
  • Daily quests and global leaderboards
Features
Read full description

Defender! Are you ready to defend your castle? In this fast paced castle defense game you requires strategy and skill. Endless hours of action await you! Upgrade and grow your castle, defend against endless waves of monsters, gather resources, improve your defense, equip and combine dozens of crossbows, spells, traps, modules and legendaries to grow stronger and stronger. The dark army does not sleep and is preparing attack after attack. Defend, fight back and kill the dark hordes - send the monsters back to the dungeon where they came from. Controls are simple: tap and hold the screen to shoot with your crossbows, drag and drop spells on monsters and strategically position traps. Grow your income and use gold, rubies and darkgold that you collect from monsters to create the best weapon combination. Grim Defender is praised for its diversity, endless equipment combinations, depth and fun gameplay. Enjoy huge action loaded battles with hundreds of enemies on the battlefield. Endless levels, tons of upgrades, items, legendaries and infinite combinations Challenging gameplay through endless levels and different game modes. Craft and customize your defense as you like. Non-linear defense and upgrade setup, hundreds of viable builds. Freely combine items to build the best defense, place explosives, lightning or stasis traps to destroy your enemies or use a cool strategy and maze up using palisades. Use fire, ice, lightning or pushback spells as well as powerful crossbows combined with modules to stop the dark monsters. Upgrade your bow to shoot stronger arrows, improve your modules to deal more damage, use multishot or have splintershot. Upgrade your castle wall, buy more defense turrets and magic towers or add an automatic turret to your castle! Choose active play to grind resources in endless mode or use the auto turret to idle grind money. Lots of unique enemies, crazy monsters and bosses Fight your way from easy zombies and skeletons to cannons, palisades and powerful epic boss monsters - can you defeat the strongest of dragons? Kill all bosses and become a legendary defender! Dailies, quests and global leaderboards with other players See how other players defend their castle and compete in global leaderboards. Participate in the season system: a fresh leaderboard is started every few month to create a fair competition with thousands of other defenders. Play dailies and quests to collect huge bonuses and get ahead of the competition. Reach the highest rank and have the highest level of all players with the best strategy and grow to be a tactical mastermind. Offline play Grim Defender does not require an internet connection to be played - play offline from anywhere and whenever you want. Frequent updates and new content Grim Defender is free to play and we are working hard to improve our game even more. Let us know what you think! Game website: https://www.grimdefender.com Company website: https://www.byteghoul.com Facebook: https://www.facebook.com/grimdefendergame Reddit: https://www.reddit.com/r/grimdefender Instagram: https://www.instagram.com/grimdefender We love defense games and made this game with a lot of passion and focus on details. We really hope that you enjoy our work! BYTEGHOUL GAMES

Screenshots

Idle Defense Octopus Evolution4 screens
Grim Defender4 screens

Verdict

The call

The clearest difference is ads: Idle Defense Octopus Evolution at none against Grim Defender's shown. Idle Defense Octopus Evolution also leads on update cadence (every 3 weeks vs every 3 months) and iOS requirement (9.0 vs 15.0). Grim Defender's advantage is review sentiment (87% vs 74%). On price, rating, ratings volume 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. Idle Defense Octopus Evolution sells 10 one-off in-app purchases and Grim Defender sells 10 one-off in-app purchases. Whichever you choose, the download price is not the number that matters.

ReceptionRating · Positive reviews · Number of ratings

Grim Defender holds the better App Store score, 4.7 against 4.6. Both are backed by a comparable volume of ratings — 1.9K and 1.1K respectively. Written reviews point the same way: 74% of Idle Defense Octopus Evolution's written reviews are positive against 87% of Grim Defender's.

UpkeepUpdate frequency

Idle Defense Octopus Evolution ships an update every 3 weeks, Grim Defender every 3 months. The most recent releases landed on November 1, 2026 and November 6, 2026 respectively.

Scorecard4 real differences · 6 level
Idle Defense Octopus Evolution versus Grim Defender: the parameters behind the verdict, then further details
ParameterIdle Defense Octopus EvolutionGrim Defender
PriceFreeFree
Rating4.6 (1.9K ratings)4.7 (1.1K ratings) — better
Positive reviews73.6% of reviews87.1% of reviews — better
Number of ratings1.9K — better1.1K
Update frequencyEvery 3 weeks — betterEvery 3 months
AdsNo — betterYes
In-app purchasesYesYes
MonetizationFree with in-app purchasesFree with in-app purchases
DevicesiPhone, iPad, iPodiPhone, iPad, iPod
Requires iOS9.0 — better15.0
Further details — not scored
Size55 MB190 MB
Age rating9+9+
DeveloperTran Anh KhoaBYTEGHOUL GAMES

Customer experience

Idle Defense Octopus Evolution

All ratings1,878 ratings
Positive88.6%
Neutral3.9%
Negative7.5%
Written reviews197 reviews
Positive73.6%
Neutral7.6%
Negative18.8%

Grim Defender

All ratings1,068 ratings
Positive94.5%
Neutral3.2%
Negative2.3%
Written reviews342 reviews
Positive87.1%
Neutral3.5%
Negative9.4%

User reviews

Idle Defense Octopus Evolution

From 1.9K App Store ratings

What we love

  • 👍 Fun game
  • 🚀 Addictive gameplay
  • 💡 Unique concept
  • 😊 Great for kids

Room to improve

  • 🐛 Frequent crashes
  • 🔒 Copyright issues
  • 🔋 High ad frequency
  • 🤯 Too difficult

Grim Defender

From 1.1K App Store ratings

What we love

  • 👍 Simple and fun gameplay
  • 🕹️ Satisfying progression and upgrades
  • 💰 Generous free-to-play model
  • 🕰️ Great time-waster game
  • 🎨 Customizable defense strategies

Room to improve

  • 🔍 Dark gold is too rare to obtain
  • 🐛 Occasional crashes and bugs
  • 🔒 Account progress loss issues
  • 📺 Intrusive ads in some cases
  • 🤖 Lack of multiplayer/social features

Bugs and requests

Idle Defense Octopus Evolution

Reported bugs

4 issues
  • DNA points disappearing
  • Restart cost too high
  • Levels not loading properly
  • Ads not working as intended

Requested features

4 requests
  • Add more upgrades and customization options
  • Improve level difficulty progression
  • Reduce in-app purchase requirements
  • Fix grammar and spelling errors

Grim Defender

Reported bugs

3 issues
  • Progress/purchase loss after updates
  • Crashes and freezes during gameplay
  • Inability to close ads after watching

Requested features

5 requests
  • More diverse enemy types
  • Additional tower/weapon options
  • Prestige system or resets
  • Improved dark gold acquisition
  • Multiplayer/co-op gameplay

In-app purchases

10 purchases

Idle Defense Octopus Evolution

One-time10
  • DNA Pack 1$0.99
  • Gem Pack 1$0.99
  • DNA Pack 2$1.99
Show 7 more
  • Remove Ads$1.99
  • DNA Pack 3$2.99
  • DNA Pack 4$3.99
  • DNA Pack 5$4.99
  • Gem Pack 5$4.99
  • DNA Pack 10$9.99
  • DNA Pack 20$19.99
10 purchases

Grim Defender

One-time10
  • Darkgold Pack XS$1.89
  • 3 Darkgold$2.99
  • 5 Darkgold$4.99
Show 7 more
  • Darkgold Pack S$5.99
  • 10 Darkgold$8.99
  • Darkgold Pack M$10.99
  • 20 Darkgold$16.99
  • Darkgold Pack L$19.99
  • Darkgold Pack XL$34.99
  • Darkgold Pack XXL$49.99

Questions

Is Idle Defense Octopus Evolution free?
Idle Defense Octopus Evolution is free to download, with in-app purchases available.
Is Grim Defender free?
Grim Defender is free to download, with in-app purchases available.
Which has better reviews, Idle Defense Octopus Evolution or Grim Defender?
Grim Defender is rated higher. Idle Defense Octopus Evolution averages 4.6 out of 5 from 1.9K ratings, while Grim Defender averages 4.7 from 1.1K ratings.
Do Idle Defense Octopus Evolution or Grim Defender have ads?
Grim Defender shows ads; Idle Defense Octopus Evolution does not.
Which is updated more often, Idle Defense Octopus Evolution or Grim Defender?
Idle Defense Octopus Evolution ships an update every 3 weeks, and Grim Defender every 3 months. Most recently, Idle Defense Octopus Evolution was updated on November 1, 2026 and Grim Defender on November 6, 2026.

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