KeyroIME
Ultra-fast conversion
Remarkably low memory footprint. The local dictionary answers in milliseconds, so conversion never keeps you waiting.
NEXT-GENERATION JAPANESE AI INPUT
Next-generation AI Japanese IMEFaster. Smarter.
KeyroIME reads the context and predicts your next words. Millisecond local-dictionary response plus AI long-sentence completion — Japanese input that never breaks your flow.
✓Core features are free ✓Open-source input engine ✓Keystrokes never leave your device
KeyroIME · Candidate conversion
ありが
LIVE INPUT
1 ありがとう
2 ありがとうございます
3 ありがとうございました
4 有り難う
5 有難う
1 / 3
Page with 、 and 。 — no arrow keys
KEYSTROKES
Other IMEs ↓↓↓↓Tab⏎ Step through one at a time
KeyroIME 、。1–9 Page, then a number — done
The open-source input core lives on GitHub. Read the implementation before you install it.
Star KeyroIME on GitHub* Figures are pulled live from GitHub.
DESIGNED FOR FLOW
Smooth all the way
past the keystroke.
Less time spent typing character by character, more time spent on what you mean. KeyroIME quietly supports your daily Japanese input.
Context-aware AI completion
Smart long-sentence prediction. Switch between business-email and internal-document tone in one click.
Privacy protection
An open-source input core. Keystroke data is never uploaded and is anonymized locally.
KEYROIME AI PRO
Resolve the hesitation
inside the input itself.
Make what you started writing more natural and easier to read. AI Pro widens your options while keeping your own voice.
Explore AI Pro✦ Ask the AIAI POINTS −1
Rewrite this as a polite, natural business email
Refined textThank you for your continued support. I am sharing the materials here and would appreciate your review.
CHOOSE YOUR PLAN
Three plans,
compared side by side.
All three are the same installer. Start with Pro — it is free. Take Open Core if you want to work on the source, or AI Pro to write with AI.
Open Core
Free · source published
- ✓ Core Japanese input & prediction
- ✓ Millisecond local-dictionary conversion
- ✓ Open source (public on GitHub)
- — Extended specialist dictionaries
- — Multi-device dictionary sync
- — AI long-form rewriting
- — Prompt & shortcut input
- — AI points
- ✓ Supported OS Windows
Pro
Free · the standard plan
- ✓ Core Japanese input & prediction
- ✓ Millisecond local-dictionary conversion
- — Open source (public on GitHub)
- ✓ Extended specialist dictionaries
- ✓ Multi-device dictionary sync
- — AI long-form rewriting
- — Prompt & shortcut input
- — AI points
- ✓ Supported OS Windows
AI Pro
Coming soon · AI points
- ✓ Core Japanese input & prediction
- ✓ Millisecond local-dictionary conversion
- — Open source (public on GitHub)
- ✓ Extended specialist dictionaries
- ✓ Multi-device dictionary sync
- ✓ AI long-form rewriting
- ✓ Prompt & shortcut input
- ✓ AI points 200 pts on sign-up
- ✓ Supported OS Windows
* Open Core and Pro are free. Availability and AI point details for AI Pro are still being prepared. All three plans ship the same Windows installer.
KeyroIME AI Academy
Japanese input tips, the AI frontier and everyday writing craft — the Keyro Academy articles we publish on GitHub.