Comparison

Stacky vs Day

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

Head to head
About

Stacky

Features
Read full description

習慣トラッカーなのに、「やめたい習慣」も管理できる。 禁煙・禁酒・間食…断ちたいことも記録して、数字で実感できるアプリです。 【こんな使い方ができます】 - 続けたい習慣 — 運動・読書・瞑想・早起きなど - やめたい習慣 — 禁煙・禁酒・間食・SNSの見すぎなど 【主な機能】 - チェックリスト — 今日やることをひと目で確認 - ストリーク — 連続達成・連続回避の日数を自動カウント - 統計グラフ — 週・月・年単位で達成率を可視化 - リマインダー通知 — 時間を指定してプッシュ通知でサポート - ホーム画面ウィジェット — ロック解除なしで今日の習慣を確認 - iCloud同期 — 複数デバイスで自動同期 【無料でできること】 習慣を最大5個まで無料で追加できます。広告表示あり。 【Stacky Pro(買い切り)】 一度のお支払いで、すべてのPro機能をずっとご利用いただけます。月額・年額の継続課金はありません。 - 習慣数 無制限 - 詳細統計・グラフ(月・年の過去データ閲覧) - 広告なし 小さな一歩を、大きな変化へ。

About

Day

Features
Read full description

Never miss a special moment again! This is a simple and intuitive countdown app that lets you see exactly how many days are left until your loved ones' birthdays and important anniversaries. ■ Recommended for: People who want to celebrate friends and family in a special way. Anyone managing wedding anniversaries, graduations, or school events. Those who want to keep track of upcoming milestones at a glance. ■ Main Features [Countdown Display] View remaining days in a large, clear list. For past events, the app automatically calculates the countdown to the next occurrence. [Smart Notifications] Set alerts for the day of, the day before, 3 days, or 7 days in advance. Customize the notification time to suit your schedule. [Widget Support] Check your countdowns right from your Home Screen. Supports Small, Medium, and Large sizes, as well as Lock Screen widgets. [Birthday Insights] Automatically displays Zodiac signs and constellations. It also includes unique features like Japanese traditional "Yakudoshi" (unlucky years) and longevity milestones (60th, 70th birthdays, etc.). [CSV Import] Register multiple events at once using CSV files. Save time and avoid manual entry. [Customization] Personalize your app with various theme colors and custom icons for each event. [Other Features] Sorting options (By remaining days or registration date) Search function to find events instantly Elapsed time display (Years/Months/Days since the event) Flexible display: Switch to "Years & Days" for events more than a year away. ■ Premium Features (One-time Purchase) Zodiac & Constellation display Traditional Milestones (Yakudoshi/Longevity) Custom Theme Colors All basic features are available for free. * Screenshots are created with AI and may differ from the actual app.

Screenshots

Stacky4 screens
Day4 screens

Verdict

The call

The clearest difference is ads: Day at none against Stacky's shown. Day also leads on update cadence (every 3 days vs every 3 weeks). On price, in-app purchases, 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. Stacky sells 1 one-off in-app purchase and Day sells 1 one-off in-app purchase. Whichever you choose, the download price is not the number that matters.

UpkeepUpdate frequency

Stacky ships an update every 3 weeks, Day every 3 days. The most recent releases landed on September 19, 2026 and September 20, 2026 respectively.

Scorecard2 real differences · 4 level
Stacky versus Day: the parameters behind the verdict, then further details
ParameterStackyDay
PriceFreeFree
Update frequencyEvery 3 weeksEvery 3 days — better
AdsYesNo — better
In-app purchasesYesYes
DevicesiPhone, iPad — betteriPhone
Requires iOS17.6 — better18.5
Further details — not scored
Size15 MB2 MB
Age rating4+4+
DeveloperSignet LLCKentaro Shirai

In-app purchases

1 purchases

Stacky

One-time1
  • Stacky プレミアム$0.49
1 purchases

Day

One-time1
  • Day-Count Premium$0.99

Questions

Is Stacky free?
Stacky is free to download, with in-app purchases available.
Is Day free?
Day is free to download, with in-app purchases available.
Do Stacky or Day have ads?
Stacky shows ads; Day does not.
Which is updated more often, Stacky or Day?
Stacky ships an update every 3 weeks, and Day every 3 days. Most recently, Stacky was updated on September 19, 2026 and Day on September 20, 2026.

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