THE CURVE vs E
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
THE CURVE
Create custom flashcards for efficient learning based on the forgetting curve. Review challenging material strategically to optimize memory retention for various subjects and exams.
- Create custom flashcards
- Supports language learning and exam prep
- Learning modes based on forgetting curve
- Review challenging cards intensively
- Track learning levels with progress indicators
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THE CURVE is a flashcards maker app that is not only based on an efficient & effective iterative learning method, but also adheres to the principles of the forgetting curve for optimal learning efficiency! You can learn various things anytime, anywhere. This app supports language learning, exam preparation, regular tests, qualification acquisition, and more! You can add as many words as you want to memorize, so let’s create your own original flashcards. With the learning mode, which is based on the correct answer rate, you can intensively review only those flashcards that you find challenging, ensuring that your study sessions align with the forgetting curve for maximum retention. Features: • You can create flashcards freely. • You can create multiple flashcards for various memorization tasks, studies, and learning objectives. • You can enter notes on both the front and back of the flashcard, which is convenient for including example sentences. • You can easily learn by simply tapping “Correct” or “Incorrect”. • By using the learning mode, you can review in an efficient and effective manner. • The app adheres to the principles of the forgetting curve, optimizing your learning efficiency. Learning Modes: You can choose from various learning modes based on your needs. These modes allow you to focus on specific aspects of your vocabulary. Here are the available options. Feel free to choose the mode that suits your learning style and goals! • Forgetting Curve Mode: Learn words based on the forgetting curve, which optimizes retention by reviewing at the right intervals. • All Flashcards Mode: Study all the cards in your set. • Unlearned Mode: Concentrate on cards you haven’t encountered yet. • Incorrect Answers Mode: Review only the cards you’ve answered incorrectly. • Correct Answers Mode: Reinforce your memory by revisiting cards you’ve answered correctly. • Challenging (Rate 40% or Less) Mode: Target cards with a low accuracy rate. • Challenging (Rate Under 50%) Mode: Focus on cards with moderate difficulty. • Challenging (Rate Under 70%) Mode: Tackle cards that need improvement. Learning and Review Based on the Forgetting Curve: • Leveraging the theory of “Ebbinghaus’ forgetting curve”, this approach prioritizes efficient learning through strategic review. • By repeating reviews at appropriate intervals aligned with the forgetting curve, you can enhance memory retention. • These review results are reflected in your “learning level”, indicating your degree of mastery. • Remember that consistent review, especially when memories are on the verge of fading, contributes significantly to long-term retention. Learning Levels Based on the Forgetting Curve: According to the forgetting curve, if you answer correctly after a certain number of days from your last learning session, your learning level will increase. Learning levels are represented by chess pieces, starting from Level 1 (Pawn). Here’s the breakdown. • Level 1 - Answer correctly after 10 minutes -> Level 2 (Knight) • Level 2 - Answer correctly after 1 day -> Level 3 (Bishop) • Level 3 - Answer correctly after 2 days -> Level 4 (Rook) • Level 4 - Answer correctly after 1 week -> Level 5 (Queen) • Level 5 - Answer correctly after 3 weeks -> Level 6 (King) • Level 6 - Answer correctly after 9 weeks -> Level 7 (Mastery Achieved) * Remember that if you make a mistake at any point, your level will reset to 0. Each flashcard has the following options: • Learn with shuffled flashcards. • Display the flip side of flashcards first. Night Mode: • Night mode is a switch to a darker theme than usual. • By setting a dark theme, you can use it without straining your eyes even when studying late at night or in bed. • Also, you no longer have to worry about disturbing others with a screen that is too bright.
E
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【単語帳作りで、勉強した気になっていませんか?】 「わからない単語をノートに書き出す。」 「電子辞書で意味を調べて、赤シートで隠せるようにペンで書く。」 かつてはそれが王道でした。しかし、現代のスピードにおいて、その作業はあまりにも「時間」というコストがかかりすぎます。書き写すだけで30分、覚える時間は残り10分……これでは本末転倒です。 もう、単語帳を「作る」のはやめましょう。 これからは、「E-tango」があなたの代わりに作ります。 【E-tango の体験:アナログの手軽さを、デジタルの頭脳で。】 教科書、参考書、あるいは街で見かけた英字新聞。 気になったその瞬間、スマホをかざしてください。 ・Snap (撮る): 複数ページでも連続で撮影OK。 ・Extract (抽出): Googleの生成AI (Vertex AI) が、画像内の英単語を瞬時にリスト化。 ・Master (習得): その場であなた専用の「単語テスト」が完成。 「書く」時間を「見る・覚える」時間へ。E-tangoは、あなたの学習密度を劇的に高めます。 【機能ハイライト】 ・ 瞬間単語抽出: 複数枚の写真から一括で単語テストを作成。 ・ AI自動定義: 最新のVertex AIが単語の意味を自動生成・最適化。 ・ スマート分類: 学年別・レベル別に自動で整理整頓。 ・ 忘却防止システム: 定着度に合わせて出題頻度を自動調整。 さあ、E-tangoを始めよう。 紙の質感も好きだけど、効率は譲れない。そんな欲張りな学習者のために。 あなたのカメラを、最強の学習ツールに変えてみませんか? 利用規約(EULA) https://www.apple.com/legal/internet-services/itunes/dev/stdeula/
Screenshots
Verdict
The clearest difference is in-app purchases: THE CURVE at none against E's 3. E's advantage is iOS requirement (13.0 vs 15.0). On price, ads 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
Both are free to download. E sells 3 in-app purchases, starting at $5.99 per month. THE CURVE asks for nothing beyond the download.
| Parameter | THE CURVE | E |
|---|---|---|
| Price | Free | Free |
| Rating | 5.0 (2 ratings) — better | — |
| Positive reviews | 66.7% of reviews | — |
| Number of ratings | 2 — better | — |
| Update frequency | Fortnightly | — |
| Ads | Yes | Yes |
| In-app purchases | No — better | Yes |
| Monetization | Ad-supported | — |
| Devices | iPhone, iPod | iPhone, iPad, iPod — better |
| Requires iOS | 15.0 | 13.0 — better |
| Further details — not scored | ||
| Size | 49 MB | 77 MB |
| Age rating | 4+ | 4+ |
| Developer | Yoshinori Tsuchiya | Sota Kondo |
In-app purchases
THE CURVE
No in-app purchases
E
- Monthly Light Plan$5.991 Month
- Monthly Standard Plan$9.991 Month
- Annual Standard Plan$89.991 Year









