# Guruko: Libre Glucose Logbook — Blood sugar diary for diabetes > Long-term blood sugar history and analysis for diabetes management. (iPhone/iPad app by 株式会社リモシア.) - Source: https://appshunter.io/ios/app/guruko-libre-glucose-logbook/id6780166458 (this page in markdown: same URL + `.md`) - Developer: [株式会社リモシア](https://appshunter.io/developer/1639657831) - Category: Medical, Health & Fitness - Price: Free - Age rating: 4+ - Requires: iOS 17.0 · 15 MB - Languages: American English - Released: 2026-07-03 - Data updated: 2026-09-10 - Monetization: freemium - User reviews in markdown: https://appshunter.io/ios/app/guruko-libre-glucose-logbook/id6780166458/reviews.md ## What is Guruko? [IMPORTANT - PLEASE READ BEFORE UPDATING] Starting with version 2.0, records are kept separately for each family member. If a device still has an older version of the app installed, records can get mixed up and deleted. Deletions propagate to every device through iCloud. - Update one device at a time - If another device has an older version, uninstall it before updating - Uninstalling does not remove your data from iCloud; reinstalling the new version restores it Guruko is a glucose viewer that fetches your Abbott FreeStyle Libre readings as a LibreLinkUp follower and stores them on your device as a long-term history - for looking back on your diabetes management and CGM trends. WHY STORE? The official LibreLink app shows only about the last 8 hours, and LibreLinkUp about 12. Guruko fetches periodically and accumulates, so you get weeks and months of history, statistics and AGP. That is what Guruko is for. FEATURES - Family separation: when you follow more than one person in LibreLinkUp, records are kept separately per person. Charts, statistics, AGP and exports cover only the person shown. Insulin pens can be assigned to an owner. - Continuous graph with the latest reading; tap or drag for details at any point - Time search: jump to any date or keyword in your history; recalculate stats and AGP for any period - Statistics: Time in Range (TIR), average, GMI (estimated HbA1c), CV, SD, daily heatmap - AGP: percentile bands folded across days to see your daily patterns - Insights: weekly highlights and rule-based pattern detection - Logs: carbs, insulin and notes overlaid on the graph - a digital blood sugar diary - NovoPen import via NFC (unofficial) - iCloud sync across your devices - Apple Health export (write-only) - CSV export WIDGETS, LOCK SCREEN & APPLE WATCH (GURUKO PRO) - Home and Lock Screen widgets with the latest value and a mini graph - Live Activity / Dynamic Island on the Lock Screen - Apple Watch app and complications Note: automatic updates are limited by the OS to save battery (no push notifications are used). Open the app to refresh. PRIVACY Your glucose data stays on your device (and your iCloud). Guruko has no backend and sends nothing to its own servers. GURUKO PRO (subscription) Core features (history, graphs, statistics, AGP, insights, CSV) are free. Pro unlocks: - Home and Lock Screen widgets - Apple Watch app and complications - Apple Health export - Lock Screen display (Live Activity / Dynamic Island) - Reports (PDF / CSV) Price: JPY 200/month or JPY 1,500/year. Payment is charged to your Apple ID account. Subscriptions renew automatically unless auto-renew is turned off at least 24 hours before the end of the current period. Manage or cancel in Settings > Apple ID > Subscriptions. Terms of Use: https://guruko.remosia.biz/terms Privacy Policy: https://guruko.remosia.biz/privacy DISCLAIMER Guruko is a viewing and logging aid, not a medical device. Displayed values are based on LibreLinkUp shared data. NovoPen import is unofficial. Always rely on official apps, devices and your healthcare professionals for diagnosis, treatment and medication decisions. This app is intended for use in Japan. The FreeStyle Libre system is approved as a medical device in Japan (approval no. 22800BZX00212000 and others). Abbott, FreeStyle, FreeStyle Libre, LibreLink, LibreLinkUp, Novo Nordisk and NovoPen are trademarks of their respective owners. Guruko is an unofficial app and is not affiliated with them. ## Key features - Long-term glucose history - Detailed statistics (TIR, GMI, CV) - AGP percentile bands - Carb, insulin, and note logging - iCloud sync - CSV export - Widgets and Apple Watch app (Pro) ## Recent user reviews (1 of 1) All indexed reviews: https://appshunter.io/ios/app/guruko-libre-glucose-logbook/id6780166458/reviews.md ### 1/5 — 血糖値データが人のものと混ざる *2026-08-04* 元々自分のリブレからの血糖値データが反映されていたはずなのに、ある時を境に同じくリブレを使っている家族の血糖値データが反映されるようになった。家族のデータを消すことも自分のものに更新することもできない。表示されるデータが混線してぐちゃぐちゃで全く使えたものではない。 **Developer response:** Lyrica_221 様 ご報告いただきありがとうございます。また、ご不便をおかけしており 大変申し訳ありません。 いただいた内容をもとに調査したところ、原因を特定いたしました。 LibreLinkUp で複数の方をフォローされている場合に、Guruko 側で 「どなたのデータを取り込むか」を選べる仕組みがなく、サーバーからの 応答順によって別の方に切り替わってしまう不具合です。ご指摘のとおり アプリ側の問題で、私どもの想定が不足しておりました。 現在、次の対応を進めております。 ・フォロー中の方を一覧から選べるようにし、勝手に切り替わらないようにする ・記録を方ごとに分けて保存し、混ざらないようにする ・設定からデータを削除できるようにする 応急的な対処として、LibreLinkUp 側でご家族の共有を一時的に解除 いただく方法がございます。解除後に Guruko を開くと確認のメッセージが 表示されますので「そのまま継続」をお選びください。以降はご本人の データのみが取り込まれます。 すでに混ざってしまった記録については、どの記録がどなたのものかを示す 情報がアプリ内に残っておらず、混在した分だけを選んで取り除くことが できません。次回のアップデートでは、記録をすべて削除して最初から やり直していただける機能をご用意いたします。 記録を長く貯めていただくためのアプリで、その根幹を損なってしまいました。 重ねてお詫び申し上げます。貴重なご報告をありがとうございました。 ご不明な点がございましたら、こちらまでお知らせください。 https://guruko.remosia.biz ## Frequently asked questions about Guruko ### What is Guruko? Guruko is a blood sugar diary that fetches your Abbott FreeStyle Libre readings as a LibreLinkUp follower. It stores this data on your device to provide a long-term history and detailed statistics for diabetes management. ### Does Guruko have ads? No, Guruko does not contain advertisements. The app is free to use with core features and offers additional functionality through a subscription. ### What are the core features of Guruko? Core features include long-term history, continuous graphs, time search, statistics like Time in Range (TIR) and GMI, AGP analysis, insights, and logging of carbs, insulin, and notes. CSV export is also available. ### What does Guruko Pro offer? Guruko Pro unlocks widgets for your home and lock screen, an Apple Watch app and complications, Apple Health export, Live Activity/Dynamic Island display, and PDF/CSV reports. This is available via a subscription. ### How much does Guruko Pro cost? Guruko Pro is available for JPY 200 per month or JPY 1,500 per year. Payment is charged to your Apple ID, and subscriptions renew automatically unless turned off at least 24 hours prior. ### Is Guruko available on Android? Based on the provided data, Guruko supports iPhone and Apple Watch. It is not indicated to be available on Android devices. ### How often is Guruko updated? The app was last updated on August 7, 2026, with version 1.1.1. Automatic updates are limited by the OS to save battery, so opening the app is recommended to refresh data. ### Is Guruko a medical device? No, Guruko is a viewing and logging aid, not a medical device. It is intended for use in Japan and relies on LibreLinkUp shared data. Always consult official apps, devices, and healthcare professionals for medical decisions. ## Version history (last 5 releases) ### 2.0.1 — 2026-09-03 BUG FIXES - Fixed an issue where the Apple Watch complication and Watch app stopped updating after the Guruko app on iPhone was relaunched. If your watch kept showing "N days ago" as stale, open Guruko on your iPhone once after this update and the latest reading will arrive. - Fixed an issue where, when logging out, readings fetched while the device clock was ahead could remain on widgets and Apple Watch. IF YOU ARE UPDATING FROM A VERSION BEFORE 2.0 Starting with version 2.0, records are kept separately for each family member. If a device still has an older version installed, records can get mixed up and deleted (deletions propagate to every device through iCloud). - Update one device at a time - If another device has an older version, uninstall it before updating - Uninstalling does not remove your data from iCloud; reinstalling the new version restores it ### 2.0.0 — 2026-08-24 [IMPORTANT - PLEASE READ BEFORE UPDATING] Starting with this version, records are kept separately for each family member. If a device still has an older version of the app installed, records can get mixed up and deleted. Deletions propagate to every device through iCloud. - Update one device at a time - If another device has an older version, uninstall it before updating - Uninstalling does not remove your data from iCloud; reinstalling the new version restores it FAMILY SEPARATION - When you follow more than one person in LibreLinkUp, records are now kept separately per person. - Charts, statistics, analysis, AGP and exports only cover the person currently shown. - Tap the name at the top of any screen to switch. You can also choose from Settings > Whose data to show. - If the same person is registered twice, merge them into one from Settings > Merge records of the same person (this can be undone). - People whose sharing has ended are marked as such; their past records are kept. - Insulin pens can now be assigned to a specific person. - Names sync through iCloud, so your other devices show the same thing. EXISTING RECORDS - Records from before this update have no owner. The app asks you once at first launch. - If you choose "I'm not sure", those records stay hidden until you assign them (the data is kept). You can assign them any time from Settings > Existing records. - You can also reassign records to a different person for a chosen date range. WIDGETS, APPLE WATCH & REPORTS - Widgets, the Lock Screen and Apple Watch now show whose reading it is. - Widgets let you pick which person to show. - Reports (PDF / CSV) carry the person's name, and it is included in the exported file name. - Readings exported to Apple Health follow along when you change who a record belongs to. OTHER IMPROVEMENTS - Pinch to zoom on the chart now centers on the midpoint between your fingers. - The chart stays put when you switch to another app while viewing a searched date. - NovoPen scanning moved to the "+" menu at the top right of the chart screen. - When you are not following anyone yet, the app now walks you through requesting sharing. - Various smaller usability improvements and bug fixes. ### 1.1.1 — 2026-08-07 HELP - Added a "Sensor records" section to Help. Tap the sensor row on the chart screen to see its serial number, activation time, elapsed and remaining days, and warm-up time. CLARIFICATION - The App Store description, the in-app paywall and the website now state that widgets require Guruko Pro. Nothing changed in the app - widgets have required Pro all along. FIXES AND IMPROVEMENTS - Fixed an issue where tapping a meal (carb) marker on the chart would not open the record. The tap area was narrower for some marker types. - Removed the "Done" button that appeared above the keyboard on the record form. Save and Cancel stay visible while typing, so you can tap them directly. ### 1.1 — 2026-07-18 This update adds time search - find and revisit any moment in your stored glucose history. JUMP TO A DATE OR KEYWORD (Trend) - Pick a date on the calendar from the magnifier button and the chart jumps to that day - Search your log notes by keyword (e.g. "ramen"); hits are highlighted in yellow on the chart, and you can step through them newest-first - While jumping, a date bar appears: re-center on the target, or tap x to return to live - Jumps far into the past are now fast and light (only the needed range is loaded) ANY PERIOD FOR STATS AND PATTERNS - Pick a start and end date from the calendar button; statistics, AGP, daily TIR and the GMI trend are recalculated for that period - Great for "that one week of travel" or before/after a medication change FROM INSIGHTS TO THE CHART - Tap the best/worst day under Insights and the Trend tab jumps to that day's curve OTHER IMPROVEMENTS AND FIXES - Your Guruko Pro renewal (or expiry) date is now shown in Settings - Widgets and Apple Watch now explain when Pro is required instead of showing a silent "-" - Fixed dates and statistics charts not rendering correctly when the device calendar is set to Japanese (wareki) - Fixed the Apple Watch standby message being truncated to "..." - Fixed graphs on Apple Watch, widgets and the Lock Screen display missing up to 15 minutes at the left edge - Fixed part of the chart briefly missing right after returning from a time-search jump to the live view - General stability and reliability improvements ### 1.0.1 — 2026-07-15 This update greatly improves the stability of Apple Watch and Lock Screen displays. APPLE WATCH - Fixed an issue where complications could stop updating after a while (delivery now respects the OS update budget) - Readings are now fetched more frequently, so the "stale" indicator appears far less often - Fixed an issue where the chart next to the reading could disappear while the number kept updating - The Watch app now fetches the latest reading on its own when opened - The elapsed-time label now updates every minute - Added recovery guidance when a manual refresh fails - Rebuilt the iPhone-Watch sync pipeline for end-to-end reliability LOCK SCREEN (Live Activity / Dynamic Island) - Fixed an issue where the display could stop updating or disappear; it is re-created every time you open the app OTHER - Fixed readings being shown with a shifted timestamp (which could also cause duplicate entries) - Added an explanation of data gaps to Help and onboarding - Fixed stale values briefly remaining on widgets and Apple Watch after logout - General stability and reliability improvements ## More apps by 株式会社リモシア - [Remosia](https://appshunter.io/ios/app/remosia/id1639657829) - [ShelfStream - Comic Reader](https://appshunter.io/ios/app/shelfstream-comic-reader/id6757660174) - [WatchTab - Auto Page Refresh](https://appshunter.io/ios/app/watchtab-auto-page-refresh/id6757919473) - [Sunlight Checker: Sun & Shadow](https://appshunter.io/ios/app/sunlight-checker-sun-and-shadow/id6759216345) - [KASEGU - フリーランス請求書・案件管理](https://appshunter.io/ios/app/kasegu/id6759525202) - [LessonTree - Lesson Journal](https://appshunter.io/ios/app/lessontree-lesson-journal/id6760742061) All apps by 株式会社リモシア: https://appshunter.io/developer/1639657831 --- *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 2026-09-10.*