Sumire Japanese Keyboard

about

description

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."

publisher

78ce6faa72264387284e647ba6938995735ec8c7d5c5a65737e55130f026307d

first seen

2026-09-23T02:56:03.497828+00:00

last event

2026-10-05 01:15 UTC

install

zapstore.dev or any Zapstore-compatible client

source & build

repository

https://github.com/KazumaProject/JapaneseKeyboard

arch flags

android-arm64-v8a

manifest

missing

releases (kind 30063)

5 releases indexed; latest 1.7.128.

version	channel	released	event
1.7.128	main	2026-10-05 00:06 UTC	d8e21d55…
1.7.123	main	2026-09-26 05:26 UTC	ccfbcc33…
1.7.122	main	2026-09-25 00:10 UTC	10512f9e…
1.7.120	main	2026-09-23 10:50 UTC	6adfe7dc…
1.7.119	main	2026-09-22 00:38 UTC	a71f14cb…

assets & verification

Every app, release and asset event is schnorr-verified (NIP-01 id + signature) before it enters the catalog, and assets are content-addressed by sha256. We subscribe read-only to the catalog relay — never write to it.

1.7.128 — app-fullStandard-arm64-v8a-release.apk

sha256

569dbf66034892af11e6651b25e68e0bd49a2ee2c6e49637c46dee4e84c87c3b

size

120.6 MB

archs

android-arm64-v8a

version code

822

apk cert sha256

ec676c30f05f3947a1aec86d02ecead150f772790b35fcaf8af484c1dd5eb4c0

download

app-fullStandard-arm64-v8a-release.apk

1.7.123 — app-fullStandard-arm64-v8a-release.apk

sha256

9bcdebea42f2ab33f34cc43083b89c649f1b92301427b400037c5c823dd82957

size

120.5 MB

archs

android-arm64-v8a

version code

817

apk cert sha256

ec676c30f05f3947a1aec86d02ecead150f772790b35fcaf8af484c1dd5eb4c0

download

app-fullStandard-arm64-v8a-release.apk

1.7.122 — app-fullStandard-arm64-v8a-release.apk

sha256

99574efa2184797b5ee34a7a66a2e5b07579b8a6fce9baf1cba4950d40c3ee2d

size

120.5 MB

archs

android-arm64-v8a

version code

816

apk cert sha256

ec676c30f05f3947a1aec86d02ecead150f772790b35fcaf8af484c1dd5eb4c0

download

app-fullStandard-arm64-v8a-release.apk

1.7.120 — app-fullStandard-arm64-v8a-release.apk

sha256

531f98b84ab42c09cd6630c6ba597c72b496d1fef65b62878c614f313c316419

size

120.5 MB

archs

android-arm64-v8a

version code

814

apk cert sha256

ec676c30f05f3947a1aec86d02ecead150f772790b35fcaf8af484c1dd5eb4c0

download

app-fullStandard-arm64-v8a-release.apk

1.7.119 — app-fullStandard-arm64-v8a-release.apk

sha256

d3029fbac69fd2967f12e1ee9155b2f8e62bc46404ba5b11124d9dc5caf12d04

size

120.5 MB

archs

android-arm64-v8a

version code

813

apk cert sha256

ec676c30f05f3947a1aec86d02ecead150f772790b35fcaf8af484c1dd5eb4c0

download

app-fullStandard-arm64-v8a-release.apk

Showing the newest 5 asset descriptors; the full set is in /api/apps/78ce6faa…