Sumire (スミレ) — The Privacy-First Japanese Keyboard

Sumire (スミレ) — The Privacy-First Japanese Keyboard

Your Words, Kept Private

• Sumire is a Japanese keyboard (IME) designed for those who value privacy above all else.

• Because it functions entirely offline, your typing habits, personal dictionary, and learning data never leave your device.

• Whether you are in a tunnel, on a plane, or handling sensitive work documents, Sumire provides a secure, lightning-fast typing experience without ever needing an internet connection.

Core Philosophy

• Total Sovereignty: Your data stays on your device. We believe in zero tracking and zero external data transmission.

• Minimalist Design: A clean, ad-free interface that is free from distractions and bloatware.

• Built for Efficiency: A lightweight engine that ensures low-latency, responsive typing regardless of your device's hardware.

Key Features

• Purely Offline: Operates flawlessly in low-signal areas like subways or mountainous regions, saving your battery in the process.

• High-Speed Conversion: Optimized predictive text that learns your patterns locally, making long-form writing or business emails effortless.

• Flexible Input: Switch seamlessly between intuitive flick-input for one-handed messaging and a traditional QWERTY layout for faster, two-handed typing.

• Modern Aesthetics: A sharp, high-visibility black and white theme designed to reduce eye strain during extended typing sessions.

• Always Free: No subscriptions, no in-app purchases, and no advertisements—just a high-quality, reliable keyboard.

Why Choose Sumire?

• Security for Professionals: Ideal for handling confidential customer information or internal business data that requires strict offline security.

• Travel Companion: Perfect for composing notes or messages while in airplane mode or while traveling abroad.

• Instant Setup: Designed for simplicity. There is no complex configuration—just install and start typing immediately.

• Device Friendly: Optimized to be lightweight, ensuring it runs smoothly even on older or low-spec Android devices.

Ideal For

• Users who prioritize data privacy and security.

• Business professionals handling sensitive information.

• Frequent travelers who need reliable input regardless of mobile connectivity.

• Anyone tired of ad-heavy, slow, and tracking-enabled keyboards.

Experience a keyboard that respects your boundaries

• With Sumire, your Japanese input is safe, swift, and simple.

• Install it today to type with perfect peace of mind.

FAQ

Q: Does Sumire require an internet connection at any point?

A: No, Sumire is designed to function 100% offline. You do not need an active data connection or Wi-Fi to install, set up, or use the app, making it incredibly reliable for travelers or those working in secure, air-gapped environments.

Q: Is my typing data stored in the cloud?

A: Absolutely not. Your personal dictionary, learned words, and typing patterns are stored strictly within the local memory of your device and are never synced or uploaded to any cloud services.

Q: Will the keyboard get slower as I use it more?

A: Sumire is built on a lightweight, high-performance engine that is designed for efficiency. Even as it learns your specific typing patterns and expands your personal dictionary locally, it remains optimized to handle those requests with extremely low latency.

Version History

v1.7.57——11 May 2026

"Sumire" is a privacy-oriented Japanese keyboard app that is completely offline compatible. Provides simple and intuitive operation and high-speed input. Download the latest version of スミレ - 完全オフラインの日本語キーボードアプリ to enjoy new features and updates immediately!

*1.7.57

- グライド入力の修正

- custom keyboard qwerty place keys and spacers

*1.7.55

- グライド入力の実装

*1.7.49

- 削除キーの上、下フリックと設定の実装

- カスタムキーボードのドーナツ入力アクションを拡張

- 特定のカスタムキーボードに遷移するアクションの追加

- フリック時の PopupView と文字のサイズの設定の追加