Comparison

Language Diary vs I

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 learn a language by writing a diary. It provides AI-powered corrections, explanations, and follow-up questions to improve your writing and understanding. You can also chat with AI characters and track your progress with weekly reports and CEFR analysis.

Highlights
  • AI diary corrections and explanations
  • Ask AI questions about your writing
  • Review mistakes with exercises
  • Weekly progress reports
  • CEFR level analysis
  • Chat with AI characters
  • Learn 13 languages
Features
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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

I

Features
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I-POTEN은 개발자 면접 준비를 더 효율적으로 할 수 있도록 돕는 AI 면접 학습 앱입니다. 실전처럼 답변하고, 필요한 IT 용어를 정리하고, 퀴즈로 복습하면서 개발자 면접 준비를 하나의 흐름으로 이어갈 수 있습니다. 주요 기능 1. AI 모의면접 개발자 면접 상황을 반영한 질문을 순차적으로 연습할 수 있어요 답변 흐름에 따라 다음 질문을 이어서 받아볼 수 있어요 기업별 기술 면접 연습에 활용할 수 있어요 면접 결과와 기록을 다시 확인할 수 있어요 2. 음성 답변 기반 면접 연습 음성으로 답변하고 STT 변환을 통해 말한 내용을 텍스트로 확인할 수 있어요 답변 내용을 돌아보며 표현과 흐름을 보완할 수 있어요 3. 결과 리포트 제공 역량 점수, 등급, 총평을 확인할 수 있어요 질문별 답변을 돌아보며 개선 포인트를 파악할 수 있어요 4. IT 용어학습 개발자 면접에 자주 나오는 IT 용어를 검색할 수 있어요 필요한 용어를 포텐노트에 저장해 나만의 학습 노트를 만들 수 있어요 카테고리와 키워드 중심으로 정리해 반복 학습할 수 있어요 5. 포텐퀴즈 학습한 내용을 퀴즈로 다시 점검할 수 있어요 최근 풀이 기록과 점수 흐름을 확인할 수 있어요 오답노트를 통해 틀린 문제만 다시 복습할 수 있어요 6. 학습 관리 최근 학습 기록과 면접 기록을 한곳에서 관리할 수 있어요 크레딧 기반으로 면접 기능을 이용할 수 있어요 이런 분께 추천해요 개발자 취업 면접을 준비 중인 분 기술 면접 답변을 반복해서 연습하고 싶은 분 IT 용어를 체계적으로 정리하고 싶은 분 퀴즈와 오답노트로 복습 효율을 높이고 싶은 분 왜 I-POTEN인가 단순 질문 모음이 아니라 질문 진행, 답변 기록, 리포트 확인, 재연습까지 이어지는 학습 흐름을 제공합니다 면접 연습과 기술 면접 학습을 한 앱에서 함께 준비할 수 있습니다 음성 답변 기반 연습과 피드백 확인으로 실전 감각을 높일 수 있습니다 안내 AI 분석 및 리포트는 참고용 정보이며 실제 평가 결과와 다를 수 있습니다 본 앱은 합격을 보장하지 않으며 학습과 연습을 돕기 위한 도구입니다 I-POTEN과 함께 개발자 면접 준비를 더 체계적으로 시작해 보세요.

Screenshots

Language Diary4 screens
I4 screens

Verdict

The call

The clearest difference is in-app purchases: I at none against Language Diary's 6. Language Diary's advantage is update cadence (every 3 days vs every 2 weeks). On price, ads, 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. Language Diary sells 6 in-app purchases, starting at $4.99 per month. I asks for nothing beyond the download.

UpkeepUpdate frequency

Language Diary ships an update every 3 days, I every 2 weeks. The most recent releases landed on October 30, 2026 and October 28, 2026 respectively.

Scorecard2 real differences · 8 level
Language Diary versus I: the parameters behind the verdict, then further details
ParameterLanguage DiaryI
PriceFreeFree
Rating4.4 (27 ratings) — better—
Positive reviews89.3% of reviews—
Number of ratings27 — better—
Update frequencyEvery 3 days — betterEvery 2 weeks
AdsNoNo
In-app purchasesYesNo — better
MonetizationFreemium—
DevicesiPhone, iPadiPhone, iPad
Requires iOS16.416.0 — better
Further details — not scored
Size100 MB56 MB
Age rating4+4+
DeveloperDaiki SatoJihan Kim

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

I

No in-app purchases

Questions

Is Language Diary free?
Language Diary is free to download, with in-app purchases available.
Is I free?
I is free to download, with no in-app purchases.
Do Language Diary or I have ads?
Neither Language Diary nor I shows ads.
Which is updated more often, Language Diary or I?
Language Diary ships an update every 3 days, and I every 2 weeks. Most recently, Language Diary was updated on October 30, 2026 and I on October 28, 2026.

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