Henji

What is Henji?

Henji is a macOS app that crafts replies in your personal writing style from rough notes or keywords. It adapts to your voice the more you use it, making chats and email replies easier every day. The app reads your past messages during setup to sound like yourself from day one, and it works across over 2 million Mac apps.

Application scenarios

Slack messages
Quickly draft replies for team syncs or casual updates.
Email correspondence
Generate polite, personal responses for clients or colleagues.
LINE chats
Reply to friends or family with warmth and brevity.
Gmail messages
Handle business inquiries or follow-ups in your own voice.
Internal team threads
Keep replies fast and to the point, warm but only the essentials.
Negotiating deadlines
Politely decline or negotiate while keeping the relationship warm.

Core Features

Voice learning
Picks up your phrasing from past threads and remembers your edits, carrying them forward.
Short, to the point
No bloated boilerplate—just a line they can read fast.
Tone adjustment per recipient
Switch agents like "Customer," "Colleague," or "Bestie" to adjust tone from formal to casual effortlessly.
Launch by selecting text
Select a line in Slack or email for an instant draft.
⌘⏎ shortcut
Fire up Henji with a keyboard shortcut on top of any app.
Saved to memory
Prefers "Will do" over "OK," softens lead-ins before requests, and ends on a warmer note.
Over 2 million Mac app compatibility
Works in almost all Mac apps.

Target users

Professionals who handle frequent messaging across Slack, email, and chat apps—such as team leads, customer support reps, salespeople, and anyone who wants to maintain a consistent personal voice without typing from scratch. Also useful for casual users who want to reply to friends and family with warmth and speed.

How to use Henji?

Download the macOS app from the official website. During setup, Henji reads your past messages to learn your writing style. To use it, select any text in Slack, email, or other apps, then press ⌘⏎ to generate a draft. The more you use it and edit replies, the better it adapts to your voice.

Pricing and free trial

No pricing or free trial information is provided on the website.

Effect review

Henji delivers on its core promise: it learns your voice from day one and keeps improving with use. The ability to switch tone per recipient—from formal to casual—makes it versatile across work and personal contexts. Its compatibility with over 2 million Mac apps means you can use it almost anywhere without switching tools. While the app is currently macOS-only, the feature set is focused and practical for anyone tired of generic AI replies. For users who value speed and personality in their messages, Henji is a solid choice.

Frequently Asked Questions

How does Henji learn my writing style?

Henji analyzes the text you provide over time, using machine learning to adapt to your vocabulary, tone, and phrasing patterns.

Can I use Henji with any app on macOS?

Yes, Henji integrates system-wide, allowing you to generate replies in any text field across macOS apps.

Do I need an internet connection to use Henji?

Henji processes data locally on your Mac, so it works offline. However, initial setup or updates may require internet.

Is my data private and secure?

Yes, your text and writing style data stay on your device. Henji does not send your personal information to external servers.

How much does Henji cost?

Henji offers a free trial. After that, it requires a one-time purchase or subscription; check the official website for current pricing.