Comparison

Language Diary vs スピフル

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

Head to head
About

Language Diary

This app helps you improve language skills by writing a diary with AI-powered corrections for grammar, vocabulary, and syntax. It also offers peer collaboration, AI chat practice, and CEFR level evaluations to enhance your learning journey.

Highlights
  • AI-powered diary corrections
  • Chat and conversation with AI
  • Peer collaboration in teams
  • CEFR level evaluation
  • Voice recording for pronunciation
  • Attach images/videos to entries
  • Passcode lock for privacy
Features
Read full description

LangJournal helps you learn a language by keeping a diary, with AI corrections, explanations, follow-up questions, and review exercises. Write about your day in the language you're learning. AI checks grammar and unnatural expressions and helps you make your writing clearer and more natural. Each correction comes with an explanation, so you can understand why a change is needed and develop your writing skills. When you're unsure about an expression, you can ask AI directly. Ask questions about your diary, such as "Does this sound natural?", "What's the difference between 'the' and 'a'?", or "How can I say this more casually?" Keeping a diary is a way to practice writing and build a daily habit of using the language. Start with one short sentence and gradually build your grammar, vocabulary, and range of expressions. [Key Features] ■ Write a Diary With AI Corrections AI checks your diary as soon as you submit it. Get help with grammar, vocabulary, and unnatural expressions to make your writing more natural. ■ Understand Why a Correction Is Needed See why each corrected part needs to change. Review your writing with explanations, rather than just looking at the corrected answer. ■ Ask AI About Your Diary Ask AI any questions you still have after a correction. Explore nuances, grammar, alternative wording, and more natural ways to express yourself. ■ Review Your Mistakes Review by writing sentences in exercises based on corrections from your diary. Practice reducing repeated mistakes and reinforcing what you've learned. ■ Look Back With Weekly Reports Review your diary entries, AI chats, words used, and words used for the first time each week. See how many days you've practiced and how much you've done to help build a learning habit. ■ Check Your English Level With CEFR Analysis Analyze your diary against CEFR levels to get an indication of your English proficiency. See an overall assessment and breakdowns covering vocabulary, grammar, and verb forms. This feature is currently available for English learners. ■ Learn by Chatting With AI Characters Talk with AI characters such as Zena, Zeb, Leon, and Mari by text or voice. Build on topics from your diary or discuss a topic you enjoy to get more practice using the language. ■ Learn in 13 Languages Study English, Korean, Japanese, Chinese, Spanish, German, French, Italian, Portuguese, Dutch, Polish, Swedish, or Tagalog. ■ Share Diaries With a Team Join a team to share diary entries and exchange comments with others learning the same language. Learning together can help you keep going when it's hard to stay consistent on your own. This feature is currently available for learners of English, German, and Korean. ■ Get Daily Support From Zena Zena supports you with comments based on your learning activity. Start with a short diary entry and find encouragement to keep learning each day. [Recommended For] ■ Learners who want to develop natural expressions by keeping a diary ■ People who want to practice writing with AI corrections ■ Learners who want to understand their mistakes and avoid repeating them ■ People who want to learn at their own pace while asking AI questions ■ Learners who want more opportunities to use the language every day ■ People who find it hard to stay consistent alone and want to enjoy learning languages

About

スピフル

This app enhances English speaking skills through AI-powered oral composition and monologue training. It offers personalized feedback and practical business scenarios to improve fluency and expression, building on proven methodologies.

Highlights
  • AI scoring and feedback
  • Oral composition training
  • Monologue English conversation practice
  • Real-time発話 speed measurement
  • Extensive business例文 library
  • AI speech correction
Features
Read full description

英語がパッと出ない、表現の幅が広がらない、英会話で成長を実感できない... 英語スピーキングの「瞬発力」「表現の幅」の課題を「口頭英作文」「独り言英会話」のトレーニングで解決します。 AI採点、AI添削により効率良くあなたの英語力の課題を解決可能。25,000人のビジネスパーソンの英語力向上を支援してきた「プログリット」だからこそ提供できる、スピーキング対策の「正解」がわかるアプリです。 <有料プラン内容> スピーキング力を伸ばせる2つのレッスンをご提供いたします。 1. 瞬発力を身につける「口頭英作文」 - 発話スピードの測定により成長を日々実感できます - 7,000以上の実践的なビジネス例文でスピーキング力を鍛えます 2. 表現の正解がわかる「独り言英会話」 - 300以上の豊富なテーマから選択し、1分間自由にスピーチをします - 録音データをご提出頂き、1日1回までAIがスピーチ添削をいたします <解約方法> 1.「設定」アプリを開く 2.「(ご自身の)お名前」をタップ 3.「サブスクリプション」をタップ 4.「スピフル」をリストから選択 5.「サブスクリプションをキャンセルする」をタップ <運営するプログリットの特徴> ①第二言語習得論と1万人以上のデータに基づく科学的な専用カリキュラムを提供。 人が外国語を習得するプロセスの研究である第二言語習得論に基づき、あなたの弱点や目標から、最適な学習方法・時間を特定。さらに英語コーチングを主要事業とする唯一※の上場企業として、1万人以上の学習データをもとに、科学と実践データの両面から専用のカリキュラムを作成します。※英語学習サービスに関わる上場企業の各社IR情報による(2023/9/1時点 当社調べ) ②英語学習の専門家がマンツーマンでコーチング。 プログリットの専属英会話コーチは、応募者数千名から採用率0.88%※を通過したビジネス英語のプロ。英語学習における目標設定、弱点の発見とそれに基づくカリキュラム提案から、日々の実行のサポートまで、英語を教えるのでなく、あなたの英語学習におけるあらゆる課題を解決します。性格診断の結果を踏まえてアサインされた専属英会話コーチが、あなたの英語学習に本気で向き合います。 ③学習効率・投下時間を最大化する利便性の高い学習アプリ。 ほぼ全ての学習コンテンツを専用アプリに搭載することで、いつでも、どこでも、あなた専用の効率的な英語学習が可能に。さらに、進捗管理アプリによって、リアルタイムで日々の学習状況を見える化。専属英会話コーチは毎日それをチェックし、英語添削とチャットによって、徹底的にフォローします。先進的なテクノロジーと専門家のサポートにより、毎日3時間の良質な英語学習を実行いただけます。 プライバシーポリシー : https://www.supiful.jp/privacy 利用規約: https://www.supiful.jp/terms 特定商取引法に基づく表示 : https://www.supiful.jp/law Terms of use: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/

Screenshots

Language Diary4 screens
スピフル4 screens

Verdict

The call

The clearest difference is review sentiment: Language Diary at 89% against スピフル's 0%. Language Diary also leads on rating (4.4 vs 4.0) and update cadence (every 3 days vs fortnightly). スピフル's advantage is in-app purchases (none vs 6). On price, ratings volume, ads and monetization model 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. Language Diary sells 6 in-app purchases, starting at $4.99 per month. スピフル asks for nothing beyond the download.

ReceptionRating · Positive reviews · Number of ratings

Language Diary holds the better App Store score, 4.4 against 4.0. Both are backed by a comparable volume of ratings — 27 and 35 respectively. Written reviews point the same way: 89% of Language Diary's written reviews are positive against 0% of スピフル's.

UpkeepUpdate frequency

Language Diary ships an update every 3 days, スピフル fortnightly. The most recent releases landed on October 15, 2026 and October 20, 2026 respectively.

Scorecard4 real differences · 6 level
Language Diary versus スピフル: the parameters behind the verdict, then further details
ParameterLanguage Diaryスピフル
PriceFreeFree
Rating4.4 (27 ratings) — better4.0 (35 ratings)
Positive reviews88.9% of reviews — better0.0% of reviews
Number of ratings2735 — better
Update frequencyEvery 3 days — betterFortnightly
AdsNoNo
In-app purchasesYesNo — better
MonetizationFree with in-app purchasesFreemium
DevicesiPhone, iPad — betteriPhone
Requires iOS16.416.0 — better
Further details — not scored
Size100 MB49 MB
Age rating4+4+
DeveloperDaiki SatoPROGRIT Inc.

Customer experience

Language Diary

All ratings27 ratings
Positive85.2%
Neutral7.4%
Negative7.4%
Written reviews27 reviews
Positive88.9%
Neutral3.7%
Negative7.4%

スピフル

All ratings35 ratings
Positive71.4%
Neutral14.3%
Negative14.3%
Written reviews28 reviews
Positive0.0%
Neutral28.6%
Negative71.4%

In-app purchases

6 purchases

Language Diary

Subscriptions6
  • Premium Monthly Subscription7 Days trial$4.991 Month
  • Pro Monthly Subscription7 Days trial$5.991 Month
  • CEFR+ Monthly Subscription$8.991 Month
Show 3 more
  • Premium Yearly Subscription7 Days trial$49.991 Year
  • Pro Yearly Subscription7 Days trial$59.991 Year
  • CEFR+ Yearly Subscription$89.991 Year
None

スピフル

No in-app purchases

Questions

Is Language Diary free?
Language Diary is free to download, with in-app purchases available.
Is スピフル free?
スピフル is free to download, with no in-app purchases.
Which has better reviews, Language Diary or スピフル?
Language Diary is rated higher. Language Diary averages 4.4 out of 5 from 27 ratings, while スピフル averages 4.0 from 35 ratings.
Do Language Diary or スピフル have ads?
Neither Language Diary nor スピフル shows ads.
Which is updated more often, Language Diary or スピフル?
Language Diary ships an update every 3 days, and スピフル fortnightly. Most recently, Language Diary was updated on October 15, 2026 and スピフル on October 20, 2026.

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