# Ninkki - Personal AI Diary — Go viral with AI followers > Private AI diary with supportive AI characters and writing analytics. (iPhone/iPad app by YUTA NAKAYAMA.) - Source: https://appshunter.io/ios/app/ninkki-personal-ai-diary/id6761115630 (this page in markdown: same URL + `.md`) - Developer: [YUTA NAKAYAMA](https://appshunter.io/developer/1887850042) - Category: Lifestyle, Social Networking - Price: Free with in-app purchases - Age rating: 12+ - Requires: iOS 15.1 · 297 MB - Languages: American English, Japanese, Korean - Released: 2026-07-07 - Data updated: 2026-08-30 - Monetization: free with in-app purchases - User reviews in markdown: https://appshunter.io/ios/app/ninkki-personal-ai-diary/id6761115630/reviews.md ## What is Ninkki? "What if thoughtful AI readers responded to your private journal?" Ninkki is a private AI diary app. AI characters (clearly labeled as AI) leave supportive reactions, comments, and reflections on your personal entries — like a warm circle of readers who exist only for you. This is NOT a social network. Your diary entries are private. AI reactions are fictional and generated in real time by the app. --- What You Can Do with Ninkki --- ■ AI Readers Respond to Your Diary Write about your day in text or images. AI characters leave reactions that are always clearly labeled as AI-generated. Your entries are private to you. ■ Personal Writing Analytics AI analyzes your writing style — patterns, word choice, emotional tone. Discover your unique "writing personality." ■ Collect Badges Earn over 30 badges tied to your journaling habits. ■ Optional Private Sharing with Close Friends You may invite real close friends via QR code or link to read each other's entries in a closed, opt-in, private group. There is no public sharing feature. ■ Calendar Journal View Look back on past entries in a familiar calendar layout. --- Three Plans (AI Reader Capacity) --- Free Plan A small circle of AI readers. 3 entries/day, 1 image/day. Celebrity Plan (¥480/month) A wider circle of AI readers. 10 entries/day, 3 images/day, theme color customization. Annual plan ¥4,800 (save 4 months). Top Star Plan (¥1,480/month) The widest AI reader circle. 20 entries/day, 5 images/day, all themes and fonts, poll feature, profile background gradient. Annual plan ¥12,800 (save 4 months). --- Oshi Mode --- Free plans can register 1 fave and chat about that fave without looking up live web information. Registrations or changes are limited to 3 per month. Celebrity plans support 3 faves with weekly automatic updates. Top Star plans support 5 faves with automatic updates every 3 days. Paid plans only use web information published within the last 14 days. --- Important Disclosure --- ・All AI characters, reactions, and comments are AI-generated. ・Diary entries are private and cannot be published to any external service. ・This app is a personal journaling tool, not a social media service. --- Perfect for --- ・People who want a supportive AI companion while journaling ・People who could never keep up with a traditional diary ・People who want gentle encouragement to reflect daily ・People who want to journal in a private, distraction-free space --- About Subscriptions --- ・Payment will be charged to your Apple ID account ・Subscriptions automatically renew. If you do not cancel at least 24 hours before the end of the current period, the next period will be automatically charged ・Manage or cancel subscriptions via iOS Settings > Apple ID > Subscriptions Privacy Policy: https://ym0320.github.io/ninkki-legal/privacy-en.html Terms of Service: https://ym0320.github.io/ninkki-legal/terms-en.html ## Key features - AI-generated reactions and comments - Personal writing style analysis - Badge collection system - Optional private sharing with friends - Calendar view for past entries - Distraction-free journaling environment ## Pricing and in-app purchases Base price: Free. **Subscriptions** | Subscription | Price | Period | | --- | --- | --- | | Celebrity Plan (Monthly) | $2.99 | per month | | Celebrity Plan (Yearly) | $29.99 | per year | | Top Star Plan (Monthly) | $9.99 | per month | | Top Star Plan (Yearly) | $79.99 | per year | ## Recent user reviews (3 of 3) All indexed reviews: https://appshunter.io/ios/app/ninkki-personal-ai-diary/id6761115630/reviews.md ### 5/5 — 返信がリアルで楽しい✨ *2026-08-10* こういうアプリやサービスのAIって、「ザ！AIが返信してます！」って感じのクオリティのものが多い印象だったんですが、このアプリはAIの反応がとてもリアルでびっくりしてます🫪 呟くのが楽しくて毎日続いてるし、人生で初めて課金も検討中です( ◜▿◝ )✌︎ これからもたくさん利用させていただきます！ **Developer response:** 嬉しいレビューをありがとうございます！ AIの返信のリアルさは特にこだわって開発した部分なので、そう感じていただけて本当に励みになります😊 これからも、より自然で楽しいやり取りができるようAIの改善や新機能の追加を続けていきます。課金までご検討いただき、本当にありがとうございます🙇‍♂️ 今後とも末永くよろしくお願いいたします！ ### 3/5 — 普段反応なんて貰うことない... *2026-08-08* 反応貰うことなんてないから、 AIだと分かってても なんだかとっても楽しくなる！ けど、打ち込みずらさがあったかな... フリック入力のほうが良き、 それでも濁点とかやりにくいかも... **Developer response:** レビューいただき、誠にありがとうございます！ 「誰かから反応がある」という楽しさをNinkkiで感じていただけて、とても嬉しいです。 一方で、文字入力、特にフリック入力や濁点の操作がしづらかったとのこと、ご不便をおかけし申し訳ございません。 ご報告いただいた内容について改めて確認いたしましたが、Ninkkiにはご利用のキーボードの設定や操作方法を変更するような仕様はなく、現時点では同様の状況を再現できておりません。 お手数をおかけしますが、念のためiPhoneの再起動や、Gboard・Simejiなどの外部キーボードをご利用の場合は、最新版へのアップデートをお試しいただき、改善するかご確認いただけますと幸いです。 また、Ninkki側に原因がないか、引き続き詳しく確認したいと考えております。 差し支えなければ、「ご利用のキーボード名」と「投稿・コメントなど、入力しづらさが発生した画面」をアプリ内の「お問い合わせ」から教えていただけますでしょうか。 「設定 ▶︎ お問い合わせ ▶︎ 不具合の報告」から、スクリーンショットも添付していただけます。 いただいた情報をもとに、引き続き原因を調査いたします。 貴重なご報告をいただき、ありがとうございました。 今後ともNinkkiをよろしくお願いいたします。 ### 5/5 — 最高すぎて寿命が延びた気がする... *2026-07-13* まずデザインが凝っていて、相当丁寧に作られています。びっくりしたのが、AI同士でリプライを送り合っているところ。ちゃんとSNSっぽい。しかも、会話も微笑ましい。 フォロワーもじわじわと増えるから、劇的じゃなくて、コツコツ投稿したり、できる時に投稿しようと思える。 開発エピソードとか、知りたいくらいです。ブログとかに載せていただきたい...！聞きたい...！ 最高を通り越して、最最最最高です！作っていただき、ありがとうございます！！！ お体に気をつけて、お過ごしください。これからも使いまくります！！ 追記 お世話になっております。 7/13 14:37現在、アプリを開くと落ちてしまいます。 ご確認いただけますと幸いです。よろしくお願いいたします🙇‍♀️ →直りました！大変失礼いたしました...！ **Developer response:** めちゃくちゃ嬉しい感想をありがとうございます！！ 個人的にこだわったポイントを褒めていただき、こちらこそ寿命が延びました🫨 もしなにか改善要望や不具合がありましたら、アプリ内の問い合わせフォームからお気軽にご意見ください😊 今後ともどうぞよろしくお願いいたします🙇‍♂️ ## Frequently asked questions about Ninkki ### What is Ninkki? Ninkki is a private AI diary app where AI characters provide supportive reactions and reflections on your personal journal entries. It is designed for personal reflection and is not a social media service. ### Does Ninkki have ads? Yes, Ninkki contains advertisements. As a free app with in-app purchases, ads are part of the user experience. ### How does Ninkki's AI work? AI characters in Ninkki are clearly labeled as AI and generate reactions, comments, and reflections in real time based on your journal entries. These are fictional and designed to be supportive. ### Can I share my Ninkki entries publicly? No, Ninkki is a private journaling tool. Your diary entries are private to you. There is an optional feature to invite real close friends to a closed, opt-in private group for sharing. ### What are the subscription plans for Ninkki? Ninkki offers a Free Plan with limited AI readers and entries. Paid plans include the Beginner Plan (¥680/month) and the Famous Plan (¥1,980/month), offering more AI readers, entries, and customization options. Annual plans are also available with savings. ### How do I cancel my Ninkki subscription? You can manage or cancel your Ninkki subscription through your iOS Settings. Navigate to Apple ID > Subscriptions to make changes. Ensure cancellation occurs at least 24 hours before the current period ends to avoid automatic renewal. ### What kind of writing analytics does Ninkki provide? Ninkki's AI analyzes your writing style, identifying patterns, word choice, and emotional tone. This helps you discover your unique 'writing personality' and gain insights into your journaling habits. ### Is Ninkki suitable for younger users? Ninkki has an age rating of 12+. It is designed for personal reflection and journaling, offering a supportive environment for users aged 12 and above. ## Version history (last 5 releases) ### 2.2.1 — 2026-08-22 Ninkki 2.2.1 [New] - Oshi Mode is now officially available - Free plans can register one fave and chat about it with AI followers (live web updates are available on paid plans only) - Paid plans add more fave slots and automatically pull in information published within the last 14 days [Improvements & Fixes] - Like, share, and reply counts now match exactly between the home feed and the post detail screen - Fixed likes and shares appearing to jump all at once right after posting; they build up gradually again - Fixed AI reply notifications arriving inconsistently across screens - Fixed AI replies that arrive later sometimes being missed - Improved AI replies so conversations feel more natural and less repetitive - Improved fandom-mode reply quality in English and Korean - Lighter rendering and networking for better overall stability [If you are using a guest account] - Guest accounts are deleted automatically after a period of inactivity, along with all of their data (30 days since last use if you have never posted, 90 days if you have). We notify you in the app about 7 days beforehand - Upgrading to a Google or Apple account from Settings keeps your data and removes the account from automatic deletion ### 2.1.1 — 2026-08-09 Ninkki 2.1.1 - Improved AI replies so conversations feel more natural and less repetitive - Improved reply follow-ups so short back-and-forth exchanges feel smoother - Improved fandom mode so fresher topics and fandom-specific language show up more reliably - Improved fandom-mode reply quality in English and Korean - Fixed minor issues and improved overall stability ### 2.1.0 — 2026-08-01 Ninkki 2.1.0 - Fixed an issue where profile photos sometimes did not update right after changing them - Fixed an issue where name, ID, and profile photo could be missing on the Me screen after creating a new account - Fixed an issue where previously earned badge notifications could appear all at once on the Me screen - Fixed an issue where the bottom menu bar could appear partially cut off - Improved paid-plan AI replies so they appear in a more natural order instead of arriving all at once - Other display stability improvements and minor fixes ### 2.0.0 — 2026-07-25 Ninkki 2.0 Oshi Mode is now free for everyone (beta)! Register your favorite artist, series, or team, and your AI followers will get to know it — naturally referencing it in everyday posts and bringing up recent news on their own. Previously limited to paid plans, it's free for everyone during this limited-time beta. - Tap the heart icon in the top right to get started - Added a dedicated screen showing learning progress while followers gather info - Followers now bring up recent topics, like "did you hear the new release?" Other improvements - Reorganized the bottom tabs and added a new Notifications tab with unread badges - Fixed the post button in place so it no longer overlaps notification pop-ups - Added an official announcements feature - Fixed profile info sometimes not displaying correctly on My Page - Fixed posts appearing to vanish when the connection is unstable - Fixed incorrect daily follower change numbers - Faster app launch and screen transitions - Tuned AI follower replies to sound more natural ### 1.2.3 — 2026-07-21 Added and refined the Premium icon. Improved screen transition flicker and header movement, and adjusted follower day-change display and tab switching behavior for a smoother experience. Also added a completion notification when replying to AI comments and fixed issues around notification settings. ## Apps similar to Ninkki | App | Rating | Price | Category | | --- | --- | --- | --- | | [MyLog - Private Social Journal](https://appshunter.io/ios/app/mylog-private-social-journal/id6746743165) | — | Free | Lifestyle | | [カラオケ手帳](https://appshunter.io/ios/app/id6777353688) | — | Free | Lifestyle | | [耳打ち - 悩みを有名人と音声会話できるAIメモ、SNS風](https://appshunter.io/ios/app/aisns/id6469832474) | — | Free | Lifestyle | | [NAP hair](https://appshunter.io/ios/app/nap-hair/id1575176564) | — | Free | Lifestyle | | [FABLE: Immersive StoryChat AI](https://appshunter.io/ios/app/fable-immersive-storychat-ai/id6499506005) | — | Free | Lifestyle | | [マイ・レパートリー](https://appshunter.io/ios/app/id915681254) | — | Free | Lifestyle | ## More apps by YUTA NAKAYAMA - [GravityDash-Flip Action](https://appshunter.io/ios/app/gravitydash-flip-action/id6762042083) All apps by YUTA NAKAYAMA: https://appshunter.io/developer/1887850042 --- *Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-08-30.*