Your Privacy-First, Local-First AI Assistant

Write smarter. Keep everything on your device.

Enjoy unlimited AI assistance with absolute privacy, zero latency, and zero server costs—all processed locally on your device.

Install extension

Gmail — OpenTrans AI

Video coming soon

Why Professionals Choose OpenTrans

Local inference, real privacy, and writing that sounds like you—not a generic chatbot.

100% Local-First AI

100% on-device processing

Calls your browser's native on-device model with zero cloud token bills—instant responses even offline.

Zero-Data-Leak Privacy

Your Texts Stay on Your Device

Selections, translations, email and chat context—100% inferred locally, never sent to third-party servers.

Match My Voice™

Write Exactly Like You Do

Feed 2–3 samples of your writing; OpenTrans builds a local Tone Profile and mimics your wording, punctuation, and sign-offs.

Your Writing DNA

Thanks — I'll get back to you EOD.
Quick note: shipping Friday as discussed.

Hi team, confirming we'll ship Friday per our earlier thread. Best, Alex

Tone matched

Rewrite, Polish & Proofread

Context-Aware Professional Writing

Proofread locally, rewrite in business or casual tones, and draft Smart Replies from the last ~10 messages in thread.

Casual draft

Hey, need this done fast.

OpenTrans polished

Could you please prioritize this task? Much appreciated!

Built for where you actually work

Anchor reverse-tracing attaches OpenTrans to the compose surface you're focused on—from email and chat apps to any text box on the page.

Gmail

Floating icon beside compose—turn casual drafts into polished business email in one click.

Outlook Web

Handles nested email context and delivers professional, well-calibrated replies.

Google Chat

Dual-pane thread isolation: when Main Chat and Thread Panel are split, AI tracks only the focused input—no context bleed.

WhatsApp Web

Same thread isolation as Google Chat—focused-input tracking with Smart Reply and context capture in split-pane chats.

Any text field

Write assistant and proofread on every input box. Rewrites and grammar fixes work everywhere; Smart Reply, context capture, and suggestions are not available on generic fields.

Traditional cloud AI vs OpenTrans

Data flows to remote servers

100% on-device processing

Traditional cloud AI

Data leakage risk - text sent to remote servers

Monthly subscription and token bills

Network latency on every request

OpenTrans AI

Local data stays on your device

$0 on-device - no cloud token spend

Millisecond on-device response