Comparison

Ebbing vs Stackd

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

Head to head
About

Ebbing

Features
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Ebbing(エビング)は、勉強内容を記録し、忘却曲線にもとづいて最適な復習タイミングをお知らせする学習サポートアプリです。 シンプルなUIで日々の勉強記録をつけるだけで、自動的に復習スケジュールを生成。 「いつ復習すればいいのか」がひと目でわかります。 もう、無計画な勉強で時間を無駄にすることはありません。 Ebbingがあなたの記憶を"定着"へと導きます。 ◇ 主な機能 • 学習範囲の記録と、忘却曲線に基づく復習スケジュールの自動生成 • 今日やるべき復習がひと目でわかるホーム画面 • 復習予定を一覧・調整できるカレンダー • 定着率・学習ヒートマップ・連続日数などの統計画面(Ebbing Plus) • 復習間隔のカスタマイズ(Ebbing Plus) • 復習リマインダー通知 • 科学的な学習方法を学べるガイド記事 ◇ 利用シーン • 資格試験や受験勉強の計画管理に • 語学学習の単語復習サイクルに • 新しい知識を確実に定着させたい人に • 忘れる前に効率よく復習したい人に ◇ アプリの特徴 Ebbingは、心理学者ヘルマン・エビングハウスが提唱した「忘却曲線」の理論をもとに設計されています。 人がどのように忘れていくかをモデル化し、適切な間隔で復習を行うことで、記憶を強化します。 ◇ Ebbing Plus(オプションの自動更新サブスクリプション) 教材数の上限解除・復習間隔のカスタマイズ・統計をご利用いただけます。 月額プラン・年額プランがあり、価格は購入画面に表示されます。購読は App Store の アカウント設定からいつでも解約できます。 利用規約: https://ebbing-app.web.app/terms.html プライバシーポリシー: https://ebbing-app.web.app/privacy.html

About

Stackd

Features
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This is a simple study timer app that allows you to record and manage your study time by subject. Simply measure your time with the timer and save it. You can also log sessions manually or add entries for past dates. You can record everything together, including subjects, study materials, pages, and notes. You can view the big picture of your studies by checking your subject balance with weekly graphs and reviewing your progress streaks on the calendar. No ads, no social media features, and no account registration required. All data is saved on your device, so there are no privacy concerns. Perfect for anyone who wants to focus on learning, from exam preparation to certifications and language studies. [Main Features] - 3 timer modes (Stopwatch, Countdown, Pomodoro) - Management of subjects, materials, pages, and notes - Weekly graphs to check subject balance (bar chart & donut chart) - Calendar to visualize study days with color-coding - Display of consecutive study days (streaks) - Daily study reminder - Backup and data export functions [Stackd Pro (One-time purchase)] - Monthly graphs and cumulative line graphs - Setting weekly goals and checking achievement rates - 9 color themes - Home screen and lock screen widgets

Screenshots

Ebbing4 screens
Stackd4 screens

Verdict

The call

The clearest difference is iOS requirement: Stackd at 18 against Ebbing's 26.0. On price, update cadence, ads and in-app purchases 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. Ebbing sells 2 in-app purchases, starting at $2.99 per month and Stackd sells 1 one-off in-app purchase. Whichever you choose, the download price is not the number that matters.

UpkeepUpdate frequency

Ebbing ships an update every 4 weeks, Stackd fortnightly. The most recent releases landed on September 21, 2026 and September 14, 2026 respectively.

Scorecard1 real difference · 5 level
Ebbing versus Stackd: the parameters behind the verdict, then further details
ParameterEbbingStackd
PriceFreeFree
Update frequencyEvery 4 weeksFortnightly — better
AdsNoNo
In-app purchasesYesYes
DevicesiPhone, iPad — betteriPhone
Requires iOS26.018 — better
Further details — not scored
Size25 MB3 MB
Age rating4+4+
DeveloperMunehito KamuraNene Nakagawa

In-app purchases

2 purchases

Ebbing

Subscriptions2
  • Ebbing Plus(月額)$2.991 Month
  • Ebbing Plus(年額)$29.991 Year
1 purchases

Stackd

One-time1
  • Stackd Pro$1.99

Questions

Is Ebbing free?
Ebbing is free to download, with in-app purchases available.
Is Stackd free?
Stackd is free to download, with in-app purchases available.
Do Ebbing or Stackd have ads?
Neither Ebbing nor Stackd shows ads.
Which is updated more often, Ebbing or Stackd?
Ebbing ships an update every 4 weeks, and Stackd fortnightly. Most recently, Ebbing was updated on September 21, 2026 and Stackd on September 14, 2026.

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