Comparison

Japanese Ruby vs LINBLE Keyboard

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

Head to head
About

Japanese Ruby

This app automatically adds furigana (ruby characters) to Japanese text. It supports input via camera, photos, pasting, and handwriting, making it ideal for beginners learning Japanese. You can also export text with furigana to PDF via email.

Highlights
  • Add furigana to Japanese text
  • Input via camera
  • Input via photo library
  • Handwriting recognition for kanji
  • Export to PDF with furigana
  • Study with hiragana or English
Features
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This is an APP that add ruby characters (furigana) to Japanese inputted by camera, photo, pasting, handwriting for Japanese beginner automatically. Usage 1: You can copy characters from Safari, and paste them into the text box, and study Japanese with hiragana or English characters. Usage 2: You can study Japanese by camera or photo library. Usage 3: You can input unknown kanji by handwriting and check how to read it. Usage 4: You can input text with keyboard, and send the text with ruby in PDF by mail.

About

LINBLE Keyboard

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【キーボードの追加方法】 1. 「設定」Appを開きます。 2. 「一般」>「キーボード」をタップします。 3. 「キーボード」>「新しいキーボードを追加」をタップします。 4. 「LinbleKeyboard」をタップします。 5. 追加された「LinbleKeyboard」をタップします。 6. 「フルアクセスを許可」をオンにします。 7. 本アプリ、またはメモアプリなどで、キーボードを表示します。地球儀キーを押し、LinbleKeyboardが表示されたら追加成功です。 【使い方】 1. 通信したいLINBLEをアドバタイズします。 2. アプリを開き、デバイスタブから接続したいLINBLEを選択します。 3. デバイスタブ上部にある「動作確認」ボタン、またはメモアプリなどで、キーボードを表示します。 4. キーボードを表示すると、LINBLEへ接続を試みます。 5. 接続が完了し通信できる状態になると、キーボード上に「通信可能です」と表示されます。 6. LINBLEからデータを送信すると、キーボードを通してデータが入力されます。 【フルアクセスについて】 LINBLEとBluetooth通信するためには「フルアクセスを許可」が必要です。 フルアクセスの使用目的はBLE通信のみです。 なお、ユーザの個人情報や入力内容の収集、利用は一切行っておりません。

Screenshots

Japanese Ruby4 screens
LINBLE Keyboard4 screens

Verdict

The call

The clearest difference is update cadence: Japanese Ruby at every 4 months against LINBLE Keyboard's every 9 months. Japanese Ruby also leads on iOS requirement (10.0 vs 15.0). 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. Neither carries in-app purchases, so what you see is what you pay.

UpkeepUpdate frequency

Japanese Ruby ships an update every 4 months, LINBLE Keyboard every 9 months. The most recent releases landed on October 9, 2026 and October 11, 2026 respectively.

Scorecard2 real differences · 6 level
Japanese Ruby versus LINBLE Keyboard: the parameters behind the verdict, then further details
ParameterJapanese RubyLINBLE Keyboard
PriceFreeFree
Positive reviews0.0% of reviews—
Update frequencyEvery 4 months — betterEvery 9 months
AdsNoNo
In-app purchasesNoNo
MonetizationFree—
DevicesiPhone, iPad, iPodiPhone, iPad, iPod
Requires iOS10.0 — better15.0
Further details — not scored
Size102 MB1 MB
Age rating4+4+
DeveloperMicrostone Inc.Musen Connect, Inc.

In-app purchases

None

Japanese Ruby

No in-app purchases

None

LINBLE Keyboard

No in-app purchases

Questions

Is Japanese Ruby free?
Japanese Ruby is free to download, with no in-app purchases.
Is LINBLE Keyboard free?
LINBLE Keyboard is free to download, with no in-app purchases.
Do Japanese Ruby or LINBLE Keyboard have ads?
Neither Japanese Ruby nor LINBLE Keyboard shows ads.
Which is updated more often, Japanese Ruby or LINBLE Keyboard?
Japanese Ruby ships an update every 4 months, and LINBLE Keyboard every 9 months. Most recently, Japanese Ruby was updated on October 9, 2026 and LINBLE Keyboard on October 11, 2026.

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