Comparison

LexFlow vs KnowUp

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

Head to head
About

LexFlow

Features
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LexFlow — 入力するだけ。ネイティブが実際に使う英語が身につく。 洋画、洋書、YouTube、Podcast…… 気になった英単語やフレーズを入力するだけ。AIがネイティブ目線の定義・例文・フォーマリティ・類似表現・文化的ニュアンスまで自動生成。自分だけの、情報量で辞書を超える単語帳が育っていきます。 【AIが自動生成する情報】 - 英語定義・例文・日本語訳・発音記号 - フォーマリティ(カジュアル/フォーマル)・使用頻度 - 類似表現の比較(ニュアンスの違いまで) - ネイティブ視点の文化的ノート - 実践的な会話例(日本語訳付き) 【その他の機能】 - 間隔反復(SRS) — 忘却曲線に基づいた最適タイミングで復習 - 発音再生 — 単語・例文をワンタップで読み上げ - マイルストーンバッジ — 学習の成長を可視化 - 学習統計 — 連続学習日数、定着度の推移 - タグ管理・ダークモード・日英バイリンガル対応 【こんな方におすすめ】 - 洋画・海外ドラマ・洋書で出会った表現を覚えたい方 - 「単語を調べて終わり」を卒業したい方 - 自分だけの単語帳を、手間なく高品質に作りたい方 入力するだけ。あとはAIにおまかせ。 EULA: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/ プライバシーポリシー: https://exuberant-cotija-a81.notion.site/LexFlow-308c02f1eecc80dcbe92ee187e5e305f

About

KnowUp

Features
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Remember what you learn. KnowUp is an AI-powered flashcard app that helps you remember more with less effort. Using spaced repetition, it reminds you to review at the right time—before you're likely to forget. Whether you're learning vocabulary, preparing for exams, or studying for school, KnowUp helps you build knowledge that lasts. ■Review at the Right Time Forgetting is a natural part of learning. Research suggests that much of what we learn fades quickly without review. KnowUp uses the proven SM-2 spaced repetition algorithm to schedule reviews based on your learning performance. Reviewing at the right intervals helps strengthen long-term memory while reducing unnecessary repetition. ■Create Flashcards with AI Creating flashcards shouldn't take longer than studying. Simply take a photo of your textbook, class handout, or notes. AI automatically extracts questions and creates flashcards for you. Review the generated cards, make any edits you want, and start learning in minutes. ■ AI explains answers clearly Instead of just memorizing the answer, you can learn while understanding why it is correct. For example sentences and questions, AI provides easy-to-understand explanations of the content and expressions, helping you deepen understanding as you review. ■ Import Anki and Quizlet content in bulk You can continue using the flashcards and study content you already have. Import Anki and Quizlet content in bulk and use it directly for review in KnowUp. It reduces the need to recreate cards from scratch, so you can start studying right away. ■Stay Motivated Every Day Learning is easier when you can see your progress. • Earn XP every time you review • Level up as you continue learning • Build daily study streaks • Track your retention and study habits with detailed statistics ■Learn Together Studying with friends makes it easier to stay consistent. Invite a study buddy with a QR code or invitation code, share your learning progress, and encourage each other along the way. Perfect for: • Language learning • English vocabulary • School subjects • Certification exams • Memorization • Lifelong learning Study smarter. Remember longer. Download KnowUp and make every review count. https://www.apple.com/legal/internet-services/itunes/dev/stdeula/

Screenshots

LexFlow4 screens
KnowUp4 screens

Verdict

The call

The clearest difference is update cadence: KnowUp at every 2 days against LexFlow's every 4 days. On price, ads, 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. LexFlow sells 2 in-app purchases, starting at $3.99 per month and KnowUp sells 2 in-app purchases, starting at $2.99 per month. Whichever you choose, the download price is not the number that matters.

UpkeepUpdate frequency

LexFlow ships an update every 4 days, KnowUp every 2 days. Both last shipped on October 31, 2026.

Scorecard1 real difference · 5 level
LexFlow versus KnowUp: the parameters behind the verdict, then further details
ParameterLexFlowKnowUp
PriceFreeFree
Update frequencyEvery 4 daysEvery 2 days — better
AdsNoNo
In-app purchasesYesYes
DevicesiPhone, iPad, iPodiPhone, iPad, iPod
Requires iOS15.015.0
Further details — not scored
Size46 MB89 MB
Age rating4+4+
Developerkanta moriWenfeng Duan

In-app purchases

2 purchases

LexFlow

Subscriptions2
  • LexFlow Pro (Monthly)$3.991 Month
  • LexFlow Pro (Annual)7 Days trial$22.991 Year
2 purchases

KnowUp

Subscriptions2
  • knowup monthly14 Days trial$2.991 Month
  • knowup annual14 Days trial$24.991 Year

Questions

Is LexFlow free?
LexFlow is free to download, with in-app purchases available.
Is KnowUp free?
KnowUp is free to download, with in-app purchases available.
Do LexFlow or KnowUp have ads?
Neither LexFlow nor KnowUp shows ads.
Which is updated more often, LexFlow or KnowUp?
LexFlow ships an update every 4 days, and KnowUp every 2 days. Most recently, LexFlow was updated on October 31, 2026 and KnowUp on October 31, 2026.

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