Raw letters in.
中英混排 out.
Nerva Input is a global typing layer for your Mac. Put your cursor in any text field, press
⌥Space, and type plain English letters. Nerva decodes them into mixed
Chinese-and-English text in real time — with whole-segment rewrites, all without ever
leaving the keyboard.
How it works
Three keystrokes from cursor to text.
Nerva never takes over your keyboard. It waits for ⌥Space, reads the field you're already in, and hands the result straight back.
Place your cursor
In any app — chat, editor, browser, terminal. Nerva reads the focused field through Accessibility.
Type raw letters
Press ⌥Space and type plain English. Nerva segments pinyin and English words live as you go.
Pick & commit
Choose a Decode or Rewrite candidate with a number key, hit Enter, and it's pasted at your cursor.
Two layers of intelligence
Decode what you typed. Rewrite what you meant.
Every Flow session gives you two candidate groups. Switch between them with Tab — decode for fidelity, rewrite for polish.
Raw letters → 中英混排
Nerva splits your stream into Chinese pinyin and English words, then ranks the most likely mixed-text reading. The top result is your default — restrained, not a giant card.
Polish the whole segment
Hit ⌘Enter and Nerva rewrites the top decode into cleaner, more structured prose — expand, condense, or translate, your choice.
Built like a tool, not a toy
Everything where your hands already are.
Keyboard-first
Number keys select, Tab switches groups, Enter commits. The mouse is optional and the panel never steals focus.
Works in any app
One Accessibility permission lets Nerva read the focused field and paste back — no per-app setup, no system input source.
Local & cloud engines
Run fully on-device, or point Nerva at DeepSeek, Ollama, or LM Studio. Falls back to local when offline.
Whole-segment rewrite
Beyond character correction — restructure, condense, expand, or translate an entire passage in one pass.
Mixed 中英 in one stream
Type Chinese and English in a single run of letters. Nerva keeps the boundaries straight so you don't switch modes.
Private by default
Raw letters and candidates live in memory only. Nothing is logged, and on-device decoding never leaves your Mac.
Engines
Your model. Your machine. Your call.
Pick the backend that decodes and rewrites your text. Switch any time from the menu bar.
Keyboard model
Five keys do everything.
One permission
Accessibility. Nothing more.
Nerva asks for a single macOS permission. There's no input-source list to wrangle and no kernel extension — just the standard Accessibility grant that lets a productivity tool see your focused field and type back into it.
Stop switching
input sources.
Install Nerva, grant one permission, and press ⌥Space. That's the whole setup.
Community & support · 社区与支持
Get builds, get help,
keep it going.
Releases ship on GitHub. Join the WeChat group for feedback and updates — and if Nerva saves you time, you can support the work.
