Lemon Zest

Lemon Zest is a local, AI-powered image editor for object removal and inpainting. Using Flux-2-Klein-4B on a Lemonade Server, it provides a near-instant "Magic Eraser" experience — all running on your own hardware.

Screenshots

Splash screen of Lemon Zest when you first open the application.

Lemon Zest inpainting selected regions of an image.

Features

• Multiple Selection Tools — Rectangle (R), Circle (C), Lasso (L), Brush (B), and Flood Fill (F) with adjustable tolerance
• AI Inpainting — Remove objects or fill regions using a custom prompt, with adjustable strength and step count
• Crop-to-Mask Optimization — Only the masked region is sent for inference, significantly reducing processing time
• Superimpose — Blend external images onto your canvas with optional prompt-guided blending
• Undo/Redo — Full history with up to 20 states (Ctrl+Z / Ctrl+Y)
• Zoom & Pan — Scroll wheel zoom with multiple preset levels (25%–400%)
• Drag & Drop — Load images by dragging them onto the window
• Format Support — PNG, JPG, JPEG, BMP, and WebP

Prerequisites

Lemon Zest requires a running Lemonade Server to perform inpainting. The server handles model loading and inference locally.

1. Install Lemonade Server following its documentation.
2. Start the server:

   lemonade run Flux-2-Klein-4B
   

   The server will listen on http://localhost:13305. The Flux model will be downloaded automatically on first launch.

Note: The Lemonade Server must be running before you start Lemon Zest. The app will show a "Connecting to server..." overlay until the server is available.

Installation

Linux (Snap)

Install from the Snap Store:

sudo snap install lemon-zest

Or build the snap locally:

sudo snap install snapcraft --classic
snapcraft
sudo snap install lemon-zest_*.snap --dangerous

Linux (From Source)

git clone https://github.com/phqen1x/lemon-zest.git
cd lemon-zest
npm install
npm start

Windows

From Release

Download the latest installer (.exe) or portable build from the Releases page.

• NSIS Installer — Standard Windows installer with custom install path
• Portable — Standalone executable, no installation required

From Source

git clone https://github.com/phqen1x/lemon-zest.git
cd lemon-zest
npm install
npm start

Building Packages

Linux

npm install
npx electron-builder --linux dir

The unpacked app will be in dist/linux-unpacked/.

Windows

npm install
npx electron-builder --win

This produces both an NSIS installer and a portable executable in dist/.

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