スミレ - 完全オフラインの日本語キーボードアプリ

Sumire is a Japanese keyboard (IME) that operates completely offline. You can input Japanese even without an internet connection. All information, including input characters, learning data, and user dictionaries, is processed and stored locally on the device. Since no data is sent to external servers, it's safe for those who prioritize privacy and security. It provides an uninterrupted Japanese input experience even in unstable locations like the subway, airplane mode, international roaming, and mountainous areas. ■ Concept "Your words stay on your device." Sumire is a Japanese input app with a strict privacy-first philosophy. It features a clean, ad-free and tracking-free design and a lightweight, low-latency input engine. It covers a wide range of scenarios, from everyday chats to business emails and long-form text writing. ■ Key Features ・Completely offline: Operates with zero data usage. Japanese typing is possible even in environments with no signal reception, minimizing battery drain. ・Comprehensive privacy protection: Data is stored and processed locally on the device. Ideal for entering highly confidential information without external transmission. ・High-speed input engine: Low-latency design that responds immediately to taps and flicks. Conversion candidates are displayed quickly, making long sentences stress-free. ・Optimized predictive conversion: Covers a wide range of words, from general language to everyday conversation and business terminology. Intelligent candidate suggestions reduce the number of taps for faster input. ・Flick input and QWERTY layout: Choose flick input for quick one-handed input, or QWERTY keyboard for those accustomed to physical keyboards or two-handed input. ・Simple and intuitive UI: No initial setup required. Switching keyboards and changing settings is easy, making it easy for even smartphone beginners. ・Black and white modern theme: A minimalist design that prioritizes visibility. Easy to see in both dark and light settings, the color scheme reduces fatigue even when typing in Japanese for long periods of time. ・Lightweight design: Launches and switches quickly as an Android keyboard. Works smoothly even on low-spec devices. ・Free and ad-free: No in-app purchases or subscriptions. We deliver a clean experience for a long time. ■ Feature details ・Predictive conversion/learning: Presents appropriate conversion candidates based on your typing habits. In-device learning eliminates unnecessary communications, improving efficiency while protecting privacy. - Flick optimization: Intuitively move up, down, left, and right from the center of the A row to quickly input "A, I, U..." with minimal effort. Ideal for thumb operation when typing with one hand. - QWERTY Japanese input: Smooth Japanese typing for those who prefer the Roman alphabet. Supports a wide range of applications, from short messages to work documents. - Improved conversion experience: Enter punctuation, symbols, and numbers with ease. Candidates switch based on context, allowing for smooth input even when composing emails or reports. - User dictionary: Register frequently used words and proper nouns to improve input efficiency. Stored on-device for peace of mind. - Stability and reliability: With no ads or tracking scripts, no unnecessary processing occurs with each input, providing a consistently fast and stable experience. ■ Recommended for ・Those who want to input Japanese offline, even on the subway, airplane, or overseas business trip ・Business users who handle highly confidential data such as customer information and internal documents ・Those who want to quickly update chats and social media accounts with one-handed flick input ・Students and working adults who want to efficiently input romaji characters using a QWERTY keyboard ・Those looking for a reliable, ad-free Japanese input app for Android ■ Example Usage Scenarios ・Replying to messages and taking notes on the commuter train (same-day experience even with unstable signal) ・Taking notes during meetings or on the go (secure, no data transfer required) ・Writing journals or manuscripts in mountainous areas or in airplane mode while traveling (completely offline for peace of mind) ・Communications requiring privacy (Japanese input on the device) ■ Reasons for choosing it with confidence Sumire is designed with privacy as its top priority, building on the foundations of a Japanese keyboard's requirements: high-speed input, accurate predictive text conversion, lightweight design, and easy one-handed operation. Since there's no external transmission, it's easy to implement even in environments with strict security policies, making it ideal for a wide range of uses, from personal to business. It offers all the functionality you need in a Japanese input method (IME), while its minimalist UI makes it easy to get started. Completely offline, privacy-conscious, fast flick input, lightweight, and ad-free, Sumire delivers a comfortable and secure typing experience to anyone using Japanese input on Android. Install it now and enter your words "safely, smoothly, and beautifully."