Comparison

Ideal Calendar vs 1分の習慣

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

Head to head
About

Ideal Calendar

Features
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A calendar that opens on one number: how many hours of today are still yours. A calendar tells you which hours are taken. What you actually want to know is the opposite. ■ Your free time, on the home screen Take the hours you're awake. Subtract what's ahead of you. "Bed at 11. It's 7 now. One hour booked at 9." — three hours left. That number is the first thing you see when you open the app. Add an event and it drops, right there. ■ No manual Long-press to add an event. Drag to move it. Swipe to delete it. Every year you've spent with a phone is the only instruction manual you need. "It probably works like this…" — and your instinct is always right. ■ What that time is being traded for Add a shift and your pay is worked out from your hourly rate, including night, overtime and holiday premiums. You can see what your free time turned into. ■ Also • One tap between month and week view • Drag across the week view to create; drag an event to move it • Colour-code your events and read the month at a glance • Attach photos to events and look back on them • A lock-screen widget for today's free time • Your events, tasks and photos stay on your device. No account required Build your day, your way.

About

1分の習慣

Features
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このアプリでは、タイマーを最大5分までしか設定できません。 なぜか? 一度始めた行動は、続けやすくなるから。 「1分だけ」のつもりが、気づいたら5分、10分。 大事なのは「長くやること」ではなく「始めること」です。 — ■ 3日坊主は「意志力」の問題じゃない 習慣が続かない本当の原因: ・いつやるか決まっていない  「毎日やる」だけでは、いつまでも始まらない ・何をするか具体的じゃない  「筋トレする」では、何をどれだけやるか毎回迷う ・目標が大きすぎる  「毎日30分」は、3日目に負担になる 「1分の習慣」は、この3つを仕組みで解決します。 — ■ 3つのシンプルな仕組み 【if-then planning】 「朝コーヒーを淹れたら、ストレッチをする」 いつ・どんな状況で・何をするかを事前に設計。 心理学者Gollwitzerの研究で、目標達成率が2〜3倍になることが実証されています。 【3ステップ分解】 やることを3つの具体的なステップに分解。 「次に何をすればいいか」を考える必要がなくなります。 【1〜5分タイマー】 始めるハードルを極限まで下げる。 1分から設定できて、最大5分。それだけでいい。 — ■ 主な機能 ・if-then planning:「いつ・何を」を設計して通知でリマインド ・1〜5分タイマー:始めるだけ。あとは流れに乗る ・カレンダースタンプ:やった日がひと目でわかる ・完全オフライン:アカウント登録不要。データは端末内に保存 — ■ こんな方に ・何度も3日坊主を経験している ・習慣化アプリを試したけど、結局続かなかった ・やりたいことはあるのに、始められない ・「頑張る」以外の方法を探している — 頑張らなくていい。仕組みに乗るだけ。 あなたのペースで、1分から。

Screenshots

Ideal Calendar4 screens
1分の習慣4 screens

Verdict

The call

The clearest difference is in-app purchases: 1分の習慣 at none against Ideal Calendar's 1. Ideal Calendar's advantage is update cadence (every 8 days vs monthly). On price, ads, device support and iOS requirement 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. Ideal Calendar sells 1 one-off in-app purchase. 1分の習慣 asks for nothing beyond the download.

UpkeepUpdate frequency

Ideal Calendar ships an update every 8 days, 1分の習慣 monthly. The most recent releases landed on October 28, 2026 and October 12, 2026 respectively.

Scorecard2 real differences · 4 level
Ideal Calendar versus 1分の習慣: the parameters behind the verdict, then further details
ParameterIdeal Calendar1分の習慣
PriceFreeFree
Update frequencyEvery 8 days — betterMonthly
AdsNoNo
In-app purchasesYesNo — better
DevicesiPhone, iPod — betteriPhone
Requires iOS15.1 — better16.4
Further details — not scored
Size26 MB46 MB
Age rating4+4+
DeveloperKoki NakanishiYUYA MASUDA

In-app purchases

1 purchases

Ideal Calendar

One-time1
  • Premium Lifetime$49.99
None

1分の習慣

No in-app purchases

Questions

Is Ideal Calendar free?
Ideal Calendar is free to download, with in-app purchases available.
Is 1分の習慣 free?
1分の習慣 is free to download, with no in-app purchases.
Do Ideal Calendar or 1分の習慣 have ads?
Neither Ideal Calendar nor 1分の習慣 shows ads.
Which is updated more often, Ideal Calendar or 1分の習慣?
Ideal Calendar ships an update every 8 days, and 1分の習慣 monthly. Most recently, Ideal Calendar was updated on October 28, 2026 and 1分の習慣 on October 12, 2026.

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