Comparison

Summoner Slime Incremental RPG vs OnceWorld

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

Head to head
About

Summoner Slime Incremental RPG

Embark on an RPG adventure as a slime, uncovering the mystery of your transformation. Befriend and summon monsters, evolve your slime through multiple stages, and master strategic skills to build the ultimate team. Enjoy deep gameplay with reincarnation loops and idle progression.

Highlights
  • Monster summoning and befriending
  • Slime evolution with branching paths
  • Strategic skill usage in battles
  • Reincarnation loop progression
  • Idle gameplay options
  • Team building and party formation
Features
Read full description

Slime Awakening: A Monster-Taming Adventure You wake up in a mysterious forest—attacked by monsters, confused, and... turned into a slime?! With no memory of how or why this happened, you team up with a mysterious Monster Cat to uncover the truth behind your transformation. A deep-dive RPG where you grow stronger through repeated reincarnations. Whether you grow steadily by leaving it idle or build strategies for short-term battles to power up quickly, it’s all up to you. Befriend Monsters, Summon Allies Defeat enemies and earn Summon Stones to call them to your side. Even former foes can become your strongest allies! Treasure chests may hide rare and powerful Summon Stones—collect them all and build your dream team. Evolve Your Slime Your slime form isn’t the end—it’s just the beginning. Unlock multiple stages of evolution, including branching paths! Customize your look, skills, and stats as your slime grows in power. Master Skills, Win Battles Strategic use of Attack, Heal, and Support skills can turn the tide of battle. Experiment with timing and combinations to outsmart your enemies! Build Your Ultimate Team Mix and match your slime, summoned monsters, and skills to create a team that fits your style. With endless combinations, your strategy is your strength. Recommended for players who: ◆ Love worlds where slimes and cats coexist ◆ Enjoy pixel art (dot-style) games ◆ Want to play games deeply and thoroughly ◆ Like inflation, roguelike, and reincarnation loop games ◆ Enjoy idle games ◆ Enjoy summon games ◆ Enjoy evolution games ◆ Love summon games (again) ◆ Like strategizing party formations ◆ Want to enjoy games offline ◆ Enjoy RPG training games ◆Looking for a game to kill some time Terms of Use: https://mangrove-caption-9f6.notion.site/Terms-Conditions-5e76d5a8c40f4624afbc0778d3980d94?pvs=4 Privacy Policy: https://mangrove-caption-9f6.notion.site/Privacy-Policy-1adae34f4c14486e8c4f2ecc10dffee0?pvs=4 Contact Us: https://mangrove-caption-9f6.notion.site/1eaf43a24b66800b88abf11c3882c73e

About

OnceWorld

Experience a nostalgic 2D solo RPG that blends classic MMO charm with modern mobile convenience. Level up, customize your character with stat distribution, enhance gear, collect pets, and battle through a deep progression system.

Highlights
  • Stat distribution for character customization
  • Equipment enhancement and set bonuses
  • Monster capture and pet raising
  • Material collection for crafting and upgrades
  • Reincarnation system for continued growth
  • Abyss Corridor ranked mode
Features
Read full description

OnceWorld is a simple and casual 2D solo-play RPG. Relive the charm of classic MMOs from the good old days — now reimagined for mobile with easy controls and deep progression! Level up, reincarnate, raise pets, awaken equipment, collect materials, and battle in the arena — all in one nostalgic adventure. It’s an RPG that brings the essence of those mid-2000s MMORPGs to your smartphone, blending nostalgia with modern convenience. ▼ Stat Distribution Distribute points into seven basic stats to develop your character. Points are earned as your hero levels up. To reset your distribution, you’ll need a special item. Stat meanings: VIT – Increases HP SPD – Attack speed & number of strikes ATK – Physical attack power INT – Magic attack power & SP capacity DEF – Mainly physical defense power M.DEF – Mainly magical defense power LUK – Evasion & Physical Critical ▼ Weapons & Armor Equip one weapon and five armor pieces. Wearing all five pieces of a matching set grants a set bonus. Use the heart icon at the top-left to toggle your favorite gear display. ▼ Equipment Enhancement Use materials obtained during your adventures to enhance your gear. Each enhancement attempt has a success rate — failure consumes the materials, but the item itself will never break. Some special items can increase success rates. ▼ Accessories Accessories grant special effects when equipped. Defeating enemies while an accessory is equipped will level it up, enhancing its effects over time. ▼ Magic Spend SP to cast powerful spells. Magic attacks cannot be evaded and there are no critical hits. Certain rare materials may further amplify spell power. ▼ Monsters & Pets By carrying a special material, you’ll gain the ability to capture monsters. Captured monsters become pets that grow stronger as they fight alongside you. Some monsters learn skills as they level up. These skills can activate even without being summoned, as long as the monster is accompanying you. Pet switching can only be done at the Pet Keeper in your hometown. Feeding specific materials will raise a pet’s stats. ▼ Monster Encyclopedia Once defeated, monsters are added to the encyclopedia where their stats can be viewed. Captured monsters will display a “Caught” mark. ▼ Materials Materials are divided into three categories: Normal Materials  Used for equipment enhancement and trading. Effect Materials  Provide passive bonuses simply by owning them.  Have a smaller carrying limit. Key Items  Only one can be held.  Cannot be dropped or sold. ▼ Items Items that grant various benefits during adventures. You can assign them to shortcut slots for quick use in the field. Swap registered items using the arrow icon beside the item list. ▼ Reincarnation When your hero reaches the level cap, you can reincarnate. Reincarnation resets your level but increases your level cap and available stat points, allowing for further growth. ▼ Abyss Corridor A ranked mode that can be played a limited number of times per day. Clear each floor by defeating all monsters as fast as possible — faster times rank higher. Treasure chests appear as rewards on each floor. Only Save Slot 1 is eligible for ranking participation. ▼ Arena Watch monster battles. Watch monster battles held several times a day. Choose the strongest team from three teams and watch the battle. Earn Arena Coins if your favorite team wins. Try exchanging them for valuable materials at the Arena Shop. ▼ About the Kin-Slayer Rite ▼ The Kin-Slayer Rite is a ceremony in which the target pet’s kin-bond, level, and accumulated experience are all returned to zero in exchange for enhancing its base stats. A monster that undergoes this rite will gain experience at a slower rate thereafter.

Screenshots

Summoner Slime Incremental RPG4 screens
OnceWorld4 screens

Verdict

The call

The clearest difference is rating: OnceWorld at 4.9 against Summoner Slime Incremental RPG's 4.3. OnceWorld also leads on update cadence (every 2 days vs every 8 days) and ratings volume (132 vs 6). Summoner Slime Incremental RPG's advantage is ads (none vs shown). On price, review sentiment, in-app purchases and monetization model 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. Summoner Slime Incremental RPG sells 10 one-off in-app purchases and OnceWorld sells 6 one-off in-app purchases. Whichever you choose, the download price is not the number that matters.

ReceptionRating · Positive reviews · Number of ratings

OnceWorld holds the better App Store score, 4.9 against 4.3. That said, the two scores are not equally well evidenced: OnceWorld has 132 ratings behind it against 6, so its average is the more settled of the two. Written reviews point the same way: 55% of Summoner Slime Incremental RPG's written reviews are positive against 58% of OnceWorld's.

UpkeepUpdate frequency

Summoner Slime Incremental RPG ships an update every 8 days, OnceWorld every 2 days. The most recent releases landed on October 25, 2026 and October 28, 2026 respectively.

Scorecard4 real differences · 6 level
Summoner Slime Incremental RPG versus OnceWorld: the parameters behind the verdict, then further details
ParameterSummoner Slime Incremental RPGOnceWorld
PriceFreeFree
Rating4.3 (6 ratings)4.9 (132 ratings) — better
Positive reviews55.2% of reviews58.1% of reviews — better
Number of ratings6132 — better
Update frequencyEvery 8 daysEvery 2 days — better
AdsNo — betterYes
In-app purchasesYesYes
MonetizationFree with in-app purchasesFree with in-app purchases
DevicesiPhone, iPodiPhone, iPad, iPod — better
Requires iOS15.015.0
Further details — not scored
Size283 MB325 MB
Age rating4+12+
DeveloperChoBit Inc.PONIX LLC

Customer experience

Summoner Slime Incremental RPG

All ratings4 ratings
Positive75.0%
Neutral0.0%
Negative25.0%
Written reviews58 reviews
Positive55.2%
Neutral17.2%
Negative27.6%

OnceWorld

All ratings130 ratings
Positive96.2%
Neutral3.1%
Negative0.8%
Written reviews74 reviews
Positive58.1%
Neutral9.5%
Negative32.4%

Bugs and requests

Summoner Slime Incremental RPG

Reported bugs

4 issues
  • Inability to progress past certain levels
  • Inventory items disappearing or not registering properly
  • Skill upgrades not working as intended
  • Crashes when accessing certain menus

Requested features

4 requests
  • Auto-play or auto-repeat features
  • Bulk opening of treasure chests
  • More customization options
  • Improved enemy AI and balancing

OnceWorld

Not enough reviews yet to summarise bugs or requests.

In-app purchases

10 purchases

Summoner Slime Incremental RPG

One-time10
  • Magic Gem I$0.99
  • Magic Gem Ⅱ$2.99
  • Auto Material Collection$2.99
Show 7 more
  • Auto Skill Activation$4.99
  • Magic Gem Ⅲ$4.99
  • Treasure Chest Pack$4.99
  • Magic Gem Ⅳ$6.99
  • Double Speed Mode Unlocked$9.90
  • Ad Removal$9.99
  • Magic Gem Ⅴ$9.99
6 purchases

OnceWorld

One-time6
  • Crystals 10$0.99
  • Crystal 50$4.99
  • Crystal 150$14.99
Show 3 more
  • Crystal 300$29.99
  • Crystal 600$59.99
  • Crystal 1000$99.99

Questions

Is Summoner Slime Incremental RPG free?
Summoner Slime Incremental RPG is free to download, with in-app purchases available.
Is OnceWorld free?
OnceWorld is free to download, with in-app purchases available.
Which has better reviews, Summoner Slime Incremental RPG or OnceWorld?
OnceWorld is rated higher. Summoner Slime Incremental RPG averages 4.3 out of 5 from 6 ratings, while OnceWorld averages 4.9 from 132 ratings.
Do Summoner Slime Incremental RPG or OnceWorld have ads?
OnceWorld shows ads; Summoner Slime Incremental RPG does not.
Which is updated more often, Summoner Slime Incremental RPG or OnceWorld?
Summoner Slime Incremental RPG ships an update every 8 days, and OnceWorld every 2 days. Most recently, Summoner Slime Incremental RPG was updated on October 25, 2026 and OnceWorld on October 28, 2026.

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