Your offline writing copilot

Keep your keyboard.
Select any text to polish or translate it.

An AI copilot that runs entirely on your phone. Long-press to select text or tap the floating button, then polish it, translate Chinese into English, or switch the tone in one tap.

Download (coming soon to Google Play) See what it does

Nothing uploaded No tracking Works with zero permissions

在嗎我剛剛看了一下報價單那個數字好像怪怪的可以再跟我說一下嗎

Hi, I just reviewed the quote and one of the figures looks off. Could you please double-check it for me? Thank you!

Pick a tone above, or tap the floating button to translate again

Core AI features

Tone polishing and Chinese-to-English translation

Everything runs offline on your phone. No API key, and your text never leaves the device.

Polishing and typo fixes

Fixes typos, punctuation and layout, then rewrites in the tone you choose.

Chinese to English

Turns Chinese into natural English, formal or casual.

Tone switching

Professional, friendly, concise and more, one tap away.

Real situations

Every day there is a message you want to get right

Replying to a client, writing to a professor, talking to overseas colleagues: select the text and tap.

A smiling salesperson in business attire

Sales · replying to a clientPolish

那個報價我再確認一下晚點回你

您好，報價內容我會再仔細確認，今天下班前回覆您，謝謝！

Student · writing to a professorProfessional

老師我報告可以晚點交嗎最近有點忙

老師您好，想請問期末報告是否能延後兩天繳交？近期事務較多，造成不便還請見諒。

Engineers talking at their desks in an office

Engineer · writing to overseas colleaguesChinese → English

這個 bug 我明天修好，修完再跟你說

I'll have this bug fixed by tomorrow and let you know once it's done.

Illustrative photos: Unsplash

Two ways to use it

No need to replace your keyboard

Keep everything your keyboard does well and call up the AI in two ways.

Option 1 · zero permissions

Text selection menu

Long-press to select text, tap “Polish” or “Translate” in the menu, and replace the original in one tap.

Option 2 · one tap away

Floating edge button

A small button on the edge of the screen. Tap it to polish the clipboard or the field you are typing in.

Privacy and security

Your text never leaves your phone

Every rewrite and translation is done by an on-device AI model. Nothing is uploaded or sent through a server.

Fully offline

Text is processed on your phone and never uploaded.

No clipboard snooping

It writes to the clipboard only when you tap “Copy”.

Skips password fields

Reads only the current field, never passwords, and is off by default.

No account, no tracking

No sign-up and no analytics.

Read the full privacy policy.

Getting started

Up and running in four steps

Install the app

Your current keyboard settings stay as they are.

Download the offline model

About 2 GB, so Wi-Fi is recommended.

Pick your tone

Choose the writing style you want.

Select text or tap the button

Polish or translate, then replace the original in one tap.

Requirements

Before you start

Device64-bit ARM Android phone, 6 GB of RAM or more recommended

Model downloadAbout 2 GB, Wi-Fi recommended

AI modelBased on Google Gemma, provided under its terms of use

Please noteThe app interface is in Traditional Chinese only. AI output can be wrong, so check it before sending.

Questions

FAQ

Is my text uploaded or stored?

No. Everything is processed on your phone. Nothing is uploaded or stored.

Do I need to turn on accessibility permissions?

No. It is only needed for the optional input sync feature, which reads the current field automatically and is off by default.

Where do I get the AI model, and how long does it take?

You download it inside the app. It is about 2 GB, so use Wi-Fi. Interrupted downloads resume where they stopped.

Which phones are supported?

64-bit ARM Android phones. 6 GB of RAM or more is recommended.

Will it change the keyboard I use now?

No. It adds a menu option and a floating button on top. Everything your keyboard does stays the same.