Comparison

ONOMATOPIA vs 眠くなるゲーム|ねむひつじ

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

Head to head
About

ONOMATOPIA

Build a serene island paradise filled with charming creatures that generate relaxing sounds. Discover unique Matopi, mix natural soundscapes, and watch your world grow even when you're offline. Perfect for unwinding, studying, or sleeping.

Highlights
  • Create custom soundscapes
  • Collect and bond with creatures
  • Idle island growth
  • Discover unique Matopi personalities
  • Over 350 million sound combinations
Features
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A Cozy Idle Game Filled with Relaxing Sounds Escape into a peaceful world where adorable Matopi create relaxing sounds and your island grows while you're away. Collect new Matopi, discover their unique personalities, and build a cozy world you'll always want to come back to. ◆Create Your Own Soundscape Mix waves, rain, wind, birds, and the melodies of your Matopi. Create over 350 million relaxing sound combinations for studying, sleeping, working, or simply unwinding. ◆ Collect & Bond with Matopi Every Matopi has its own personality. Pet them, play with them, and grow closer over time. The stronger your bond becomes, the more surprises they may reveal. ◆ A World That Never Stops Growing Your island continues to grow even while you're away. Unlock new habitats, discover rare Matopi, and slowly uncover the mysteries of Onomatopia together with Siesta. ◆Slow Down. Relax. Stay a While. Onomatopia is more than an idle game. It's a peaceful place filled with gentle sounds, lovable creatures, and quiet moments you'll want to return to every day.

About

眠くなるゲーム|ねむひつじ

Features
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羊を1頭ずつ、柵に入れるだけ。 遊ぶほどゆっくり・暗く・静かになって、手が止まると勝手に終わる、寝る前のためのゲームです。 ■ あそびかた ・左から羊がやってきて、柵の前で待っています ・画面をタップするか、上にスワイプすると、羊が柵をこえます ・失敗はありません。点数も、時間制限もありません ■ だんだん眠くなるしくみ ・10頭ごとに、羊の歩みがゆっくりになります ・時間とともに、画面の色が夜の青からあたたかい色へ変わり、暗くなっていきます ・画面の明るさを少しずつ下げることもできます(最初に選べます。アプリを閉じると元に戻ります) ・45秒ほど触らないと、30秒かけて暗くなって終わります。寝落ちしても画面が光り続けません ■ 朝、あたらしいひつじが来る ・夜(18時〜翌5時)に1頭でも柵をこえると、翌朝、図鑑にあたらしいひつじが1頭やってきます ・毛色と特徴の組み合わせで全60種。集めたひつじは、夜の牧場にも出てきます ・連続記録はありません。休んだ夜があっても損はしません ■ タイマー ・「手が止まるまで」と「15分」は無料で使えます ■ フル版(買い切り) ・ひつじ図鑑の全60種(無料版は30種まで) ・タイマー30分・60分 ・ひつじに名前をつける ■ 広告なし 広告は表示しません。データはすべて端末の中だけに保存され、外部へ送信しません。 ※本アプリはゲームです。医療を目的としたものではなく、睡眠の改善などの効果を保証するものではありません。

Screenshots

ONOMATOPIA4 screens
眠くなるゲーム|ねむひつじ4 screens

Verdict

The call

The clearest difference is ads: 眠くなるゲーム|ねむひつじ at none against ONOMATOPIA's shown. On price, update cadence, in-app purchases 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

Both are free to download. ONOMATOPIA sells 9 in-app purchases, starting at $19.99 per year and 眠くなるゲーム|ねむひつじ sells 1 one-off in-app purchase. Whichever you choose, the download price is not the number that matters.

UpkeepUpdate frequency

Both ship on a similar rhythm, roughly every 11 days. The most recent releases landed on November 14, 2026 and November 13, 2026 respectively.

Scorecard1 real difference · 9 level
ONOMATOPIA versus 眠くなるゲーム|ねむひつじ: the parameters behind the verdict, then further details
ParameterONOMATOPIA眠くなるゲーム|ねむひつじ
PriceFreeFree
Rating5.0 (7 ratings) — better—
Positive reviews69.6% of reviews—
Number of ratings7 — better—
Update frequencyEvery 11 daysEvery 11 days
AdsYesNo — better
In-app purchasesYesYes
MonetizationFree with in-app purchases—
DevicesiPhone, iPad, iPod — betteriPhone, iPod
Requires iOS15.015.0
Further details — not scored
Size241 MB19 MB
Age rating4+4+
DeveloperENDROLL, K.Ksyoutarou ookura

In-app purchases

9 purchases

ONOMATOPIA

Subscriptions1
  • Grand Maestro (1-Year Plan)$19.991 Year
One-time8
  • Full Energy Recharge$0.99
  • Start Dash2 variants$1.99
  • This Month's Mission Pass$2.99
Show 5 more
  • Premium Gacha Coins x3$3.99
  • Ad Coupons x100$3.99
  • Start Dash++$4.99
  • Matopi Mania$5.99
  • Premium Gacha Coins x3$5.99
1 purchases

眠くなるゲーム|ねむひつじ

One-time1
  • フル版$2.99

Questions

Is ONOMATOPIA free?
ONOMATOPIA is free to download, with in-app purchases available.
Is 眠くなるゲーム|ねむひつじ free?
眠くなるゲーム|ねむひつじ is free to download, with in-app purchases available.
Do ONOMATOPIA or 眠くなるゲーム|ねむひつじ have ads?
ONOMATOPIA shows ads; 眠くなるゲーム|ねむひつじ does not.
Which is updated more often, ONOMATOPIA or 眠くなるゲーム|ねむひつじ?
ONOMATOPIA ships an update every 11 days, and 眠くなるゲーム|ねむひつじ every 11 days. Most recently, ONOMATOPIA was updated on November 14, 2026 and 眠くなるゲーム|ねむひつじ on November 13, 2026.

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