ホライゾン 日本語入力：オフラインのフリック入力キーボード
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About this app
"Horizon Japanese Input" is a secure on-screen keyboard app that does not require network access permissions.
It is free to use and completely ad-free.
Not only does it function perfectly in offline environments such as airplane mode,
it is guaranteed at the OS level by Android's architecture that it will never (and cannot) communicate with external servers under any circumstances.
For reference: There is also an explanation page with images.
https://support.raiiware.com/horizon/introduction/?
Advantages of not requiring network access permissions
Security and privacy:
Since no communication with external servers occurs, information leakage of any kind is impossible.
Economical benefits:
It consumes absolutely no data packets.
Energy-saving and battery-friendly:
It consumes no power for communication. It's strictly zero.
Lightweight and smooth operation with "nothing unnecessary"
This keyboard app is designed to work without performance issues even on smartphone models from several generations ago.
Input, convert, and confirm characters. To ensure a stress-free and low-load experience on your smartphone, this app has been optimized and optimized in various ways.
Available On-Screen Keyboards
The following on-screen keyboards are available:
(1) Japanese Keyboard ("Flick Input," "GODAN")
(2) English Keyboard ("Flick Input," "Full Keyboard")
(3) Number-Only Keyboard
There is also an auxiliary panel for entering emojis and symbols.
Comfortable Kanji Conversion
With its "extensive vocabulary data" and "kanji conversion engine that predicts the original input even with input errors," this app provides comfortable kanji conversion. It won't interrupt your thought process.
Omitted Modifier Keys
In this keyboard app, for example, instead of typing "gakkou," you can type "katsukou," and "gakkou" will appear as a conversion candidate.
In other words, you can omit inputting the voiced consonant mark for "ga" or the lowercase version of "tsu."
Omitting these significantly reduces the effort required for input.
Undo Confirmation
You can also undo a confirmed kanji conversion and revert to the hiragana before conversion.
Only immediately after confirming a kana-kanji conversion, you can return to the "pre-confirmation state" by tapping the "Undo" key in the upper left corner of the on-screen keyboard.
Changing Sentence Boundaries with Taps
You can change the sentence boundary during kana-kanji conversion by tapping.
You can intuitively change the sentence boundary.
Automatic Suggestion of Next Input Based on Previous Input
For example, if you type "Akemashite" and confirm it, "Omedetou" and "Omedetou gozaimasu" will be automatically suggested as next input candidates.
For standard phrases, you can input the latter half without typing a single character.
What This App Cannot Do
If you download or install this app, please note the following:
* Hardware keyboards are not supported.
Disclaimer
This app is provided "as is" without warranty of any kind, express or implied. Raiiware shall not be held liable for any damages arising from the use of this application.
It is free to use and completely ad-free.
Not only does it function perfectly in offline environments such as airplane mode,
it is guaranteed at the OS level by Android's architecture that it will never (and cannot) communicate with external servers under any circumstances.
For reference: There is also an explanation page with images.
https://support.raiiware.com/horizon/introduction/?
Advantages of not requiring network access permissions
Security and privacy:
Since no communication with external servers occurs, information leakage of any kind is impossible.
Economical benefits:
It consumes absolutely no data packets.
Energy-saving and battery-friendly:
It consumes no power for communication. It's strictly zero.
Lightweight and smooth operation with "nothing unnecessary"
This keyboard app is designed to work without performance issues even on smartphone models from several generations ago.
Input, convert, and confirm characters. To ensure a stress-free and low-load experience on your smartphone, this app has been optimized and optimized in various ways.
Available On-Screen Keyboards
The following on-screen keyboards are available:
(1) Japanese Keyboard ("Flick Input," "GODAN")
(2) English Keyboard ("Flick Input," "Full Keyboard")
(3) Number-Only Keyboard
There is also an auxiliary panel for entering emojis and symbols.
Comfortable Kanji Conversion
With its "extensive vocabulary data" and "kanji conversion engine that predicts the original input even with input errors," this app provides comfortable kanji conversion. It won't interrupt your thought process.
Omitted Modifier Keys
In this keyboard app, for example, instead of typing "gakkou," you can type "katsukou," and "gakkou" will appear as a conversion candidate.
In other words, you can omit inputting the voiced consonant mark for "ga" or the lowercase version of "tsu."
Omitting these significantly reduces the effort required for input.
Undo Confirmation
You can also undo a confirmed kanji conversion and revert to the hiragana before conversion.
Only immediately after confirming a kana-kanji conversion, you can return to the "pre-confirmation state" by tapping the "Undo" key in the upper left corner of the on-screen keyboard.
Changing Sentence Boundaries with Taps
You can change the sentence boundary during kana-kanji conversion by tapping.
You can intuitively change the sentence boundary.
Automatic Suggestion of Next Input Based on Previous Input
For example, if you type "Akemashite" and confirm it, "Omedetou" and "Omedetou gozaimasu" will be automatically suggested as next input candidates.
For standard phrases, you can input the latter half without typing a single character.
What This App Cannot Do
If you download or install this app, please note the following:
* Hardware keyboards are not supported.
Disclaimer
This app is provided "as is" without warranty of any kind, express or implied. Raiiware shall not be held liable for any damages arising from the use of this application.
A keyboard app with no network access permissions. Supports Japanese flick input. Lightweight as possible. Free. No ads. Works perfectly in airplane mode. Secure and battery-friendly.
Updated on
Safety starts with understanding how developers collect and share your data. Data privacy and security practices may vary based on your use, region, and age. The developer provided this information and may update it over time.
- No data shared with third partiesLearn more about how developers declare sharing
- No data collectedLearn more about how developers declare collection
What’s new
v0.84.0 (2026-09-11)
改良
・辞書データの更新
・コロケーションデータの追加
v0.83.0 (2026-09-09)
仕様変更
・ローマ字削除の仕様を調整
・Godanキーボードでの数字入力を半角に
改良
・設定画面を整理
・キーボードの挙動を調整
v0.82.0 (2026-09-08)
改良
・キーボードの挙動を調整
・ローマ字の末尾母音省略入力を試験的に実装
・コロケーションデータの追加
v0.81.0 (2026-09-05)
機能追加
・Godanキーボードを追加
v0.80.0 (2026-09-02)
改良
・言語モデルの調整
・コロケーションデータの追加
v0.79.0 (2026-08-30)
改良
・言語モデルの調整
・コロケーションデータの追加
v0.78.0 (2026-08-25)
改良
・さらなる省メモリ化
・辞書データの調整
・言語モデルの調整
・コロケーションデータの追加
v0.77.0 (2026-08-19)
改良
・辞書データの更新
・かな漢字変換エンジンの調整
改良
・辞書データの更新
・コロケーションデータの追加
v0.83.0 (2026-09-09)
仕様変更
・ローマ字削除の仕様を調整
・Godanキーボードでの数字入力を半角に
改良
・設定画面を整理
・キーボードの挙動を調整
v0.82.0 (2026-09-08)
改良
・キーボードの挙動を調整
・ローマ字の末尾母音省略入力を試験的に実装
・コロケーションデータの追加
v0.81.0 (2026-09-05)
機能追加
・Godanキーボードを追加
v0.80.0 (2026-09-02)
改良
・言語モデルの調整
・コロケーションデータの追加
v0.79.0 (2026-08-30)
改良
・言語モデルの調整
・コロケーションデータの追加
v0.78.0 (2026-08-25)
改良
・さらなる省メモリ化
・辞書データの調整
・言語モデルの調整
・コロケーションデータの追加
v0.77.0 (2026-08-19)
改良
・辞書データの更新
・かな漢字変換エンジンの調整
