Comparison

OnceWorld vs Cool x Cool

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

Head to head
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.

About

Cool x Cool

Experience the daily lives of three university students in Tokyo. Follow the stories of Reika, Miyako, and Midori as you uncover their cool and cute interactions. This is an iOS port of a 2016 visual novel.

Highlights
  • University student life simulation
  • Character-driven story
  • Visual novel gameplay
  • iOS port of a classic title
  • Engaging narrative
Features
Read full description

都内に通う普通の大学生の日常を少しのぞいてみませんか? 一見クールな見た目の麗華ととても可愛らしい美代子。 そして二人を支える存在のみどり。 3人のクールな物語をお楽しみください。 本作品はNewfrontiaSoftwareが2016年にリリースした作品のiPhone/iPad向け移植作品となります。

Screenshots

OnceWorld4 screens
Cool x Cool3 screens

Verdict

The call

The clearest difference is price: OnceWorld at Free against Cool x Cool's $1.99. OnceWorld also leads on update cadence (every 2 days vs every 3 months) and iOS requirement (15.0 vs 18). Cool x Cool's advantage is in-app purchases (none vs 6) and ads (none vs shown). On 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

OnceWorld is free to download; Cool x Cool costs $1.99 up front. OnceWorld sells 6 one-off in-app purchases. Cool x Cool asks for nothing beyond the download.

UpkeepUpdate frequency

OnceWorld ships an update every 2 days, Cool x Cool every 3 months. The most recent releases landed on October 25, 2026 and September 26, 2026 respectively.

Scorecard6 real differences · 4 level
OnceWorld versus Cool x Cool: the parameters behind the verdict, then further details
ParameterOnceWorldCool x Cool
PriceFree — better$1.99
Rating4.9 (132 ratings) — better—
Positive reviews58.1% of reviews—
Number of ratings132 — better—
Update frequencyEvery 2 days — betterEvery 3 months
AdsYesNo — better
In-app purchasesYesNo — better
MonetizationFree with in-app purchases — betterPaid
DevicesiPhone, iPad, iPod — betteriPhone, iPad
Requires iOS15.0 — better18
Further details — not scored
Size325 MB300 MB
Age rating12+4+
DeveloperPONIX LLCNewfrontiaSoftware

In-app purchases

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
None

Cool x Cool

No in-app purchases

Questions

Is OnceWorld free?
OnceWorld is free to download, with in-app purchases available.
Is Cool x Cool free?
Cool x Cool costs $1.99, with no in-app purchases.
Do OnceWorld or Cool x Cool have ads?
OnceWorld shows ads; Cool x Cool does not.
Which is updated more often, OnceWorld or Cool x Cool?
OnceWorld ships an update every 2 days, and Cool x Cool every 3 months. Most recently, OnceWorld was updated on October 25, 2026 and Cool x Cool on September 26, 2026.

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