AI Writer for Any App

Draft, rewrite, fix grammar, and reply to messages right inside WhatsApp, Gmail, Slack, or any Android app. No copy-pasting. Powered by Google Gemini.

Download Free on Google Play See all features

Arc AI Writer is a freemium Android app that writes, rewrites, and replies to text directly inside any app — WhatsApp, Gmail, Slack, or any other. It works as a floating sidebar overlay with four modes: Rewrite, Fix Grammar, Reply to conversations, and Create Post. You can choose tone and length, and it pulls from your Info Vault for personalized drafts. No copy-pasting required — it types directly into the input field on your screen.

Writing Modes

Four writing modes, one swipe away

Whether you need to rewrite, fix grammar, reply, or create — Arc has you covered.

✏️

Rewrite

Select any text and tap Rewrite to rephrase it in a different tone or style. Make formal emails casual, or casual messages professional.

✅

Fix Grammar

Instantly correct spelling, grammar, and punctuation errors in any text field. Works in WhatsApp, Gmail, Slack, and any app.

💬

Reply

Get AI-suggested replies based on the conversation on your screen. Arc reads the context and drafts a relevant response you can send immediately.

📝

Create Post

Generate social media posts, captions, or any content from a prompt. Choose tone and length, and Arc writes it for you right in the input field.

Why Arc AI Writer

Write smarter, not harder

Arc understands the context on your screen and writes for you — right where you need it.

📱

Works in Any App

Arc appears as a floating sidebar over any app. Write in WhatsApp, Gmail, Slack, Instagram, or anywhere else — no copy-pasting between apps.

🎭

Tone & Length Control

Choose from tones like professional, casual, friendly, or concise. Adjust length to be brief or detailed. Your writing, your style.

🧠

Screen-Aware Context

Arc reads what's on your screen to understand context. Reply suggestions reference the actual conversation. No explaining needed.

🗄️

Info Vault Integration

Store your personal details in Info Vault — your name, role, writing preferences — and AI Writer automatically personalizes every draft.

⚡

One-Tap Drafting

Swipe to open Arc, tap your writing mode, and get a draft in seconds. No prompting, no configuration, no waiting.

🔒

Private & Secure

Your data is encrypted in transit and never stored on our servers. Arc respects your privacy by design.

How It Works

Write in 3 steps

1

Open any app

Start typing in WhatsApp, Gmail, Slack, or any other app where you want to write.

2

Swipe & choose your mode

Swipe from the screen edge to open Arc\'s sidebar, then tap Rewrite, Fix Grammar, Reply, or Create Post.

3

Insert & send

Arc generates your text based on the screen context. Tap to insert it into the input field and send — all without leaving the app.

FAQ

AI Writer FAQ

How does the AI writer work on Android?
Arc AI Writer lives in a floating sidebar on your Android screen. When you want to write something, swipe to open Arc, choose your mode (Rewrite, Fix Grammar, Reply, or Create Post), and it generates text based on what's on your screen. You can then insert it directly into any input field.
Can I use the AI writer in WhatsApp?
Yes. Arc works as an overlay in any app, including WhatsApp, Gmail, Slack, Telegram, Instagram, and every other Android app. You never have to leave the app you're writing in.
Is the AI writer free?
Yes, all writing modes — Rewrite, Fix Grammar, Reply, and Create Post — are free to use with no limits on the free tier. An optional premium subscription removes ads and unlocks additional features.
How is Arc AI Writer different from ChatGPT or other AI writing tools?
Arc is screen-aware — it reads what's on your screen to understand context and generate relevant text. Unlike ChatGPT, you don't need to copy-paste text, switch apps, or explain what you're replying to. Arc already knows the context from your screen.
Can I customize the writing style?
Yes. You can choose from multiple tones (professional, casual, friendly, concise) and adjust length (brief, medium, detailed). You can also set up your Info Vault with personal details like your name and role, and AI Writer uses them to personalize drafts.
What languages does the AI writer support?
Arc's AI Writer works with any language supported by Google Gemini. The interface and predefined actions are available in 10 languages including English, Spanish, German, French, Portuguese, Korean, Japanese, Indonesian, and Arabic.
Does AI Writer work with custom prompts?
Yes. In addition to the four built-in modes, you can create Custom Actions with your own prompts. For example, "Write a polite decline for this meeting invite" or "Translate this to French and make it formal."
More Features

Arc does more than write

📋

AI Summarizer

Summarize any screen instantly

 🔍

Smart Extract

Pull events, OTPs, and contacts from any screen

 🃏

Flashcard Generator

Turn any screen into study flashcards

 🔊

Read Aloud

Listen to summaries with text-to-speech

Write smarter in any app

Download Arc free and start drafting, rewriting, and replying with AI — right inside WhatsApp, Gmail, and every other app.

Download on Google Play