Audience
Software developers, programmers, and technical professionals on macOS who value fast, responsive editing, large-file performance, local workflows, keyboard-driven operation, and a scriptable environment.
About Koi Editor
Koi Editor is a professional text editor for Mac, built around three principles: fast, local, and scriptable.
Koi is designed for responsive editing from ordinary source files to very large documents. It includes multi-cursor editing, synchronized views, project-wide search, context-aware autocomplete, syntax highlighting for 30+ languages, code folding, file outlines, configurable themes and keybindings, and extensive editing commands.
Koi requires no account, includes no telemetry, and can operate entirely offline. Configuration and keybindings are plain text, and custom editor commands can be written in Python.
Optional AI features connect directly to local models through Ollama for code completion and inline assistance.
Built specifically for Apple Silicon Macs, Koi combines a high-performance editing core with native macOS integration.
Other Popular Alternatives & Related Software
UltraEdit
UltraEdit is a text and code editor built for work that general-purpose editors often struggle with: large files, complex data manipulation, and security-sensitive workflows. It has been in the market for more than 30 years, is used by over 4 million users worldwide, and is trusted by enterprise customers across the Fortune 100, 500, and 1000.
Individual users choose UltraEdit when everyday editors start to hit their limits. Common use cases include working with very large files, running advanced search and replace, using column and block editing, and handling more complex text and data manipulation.
Organizations choose UltraEdit when they need a more secure and supportable editor behind sensitive workflows. That includes teams in banking, insurance, healthcare, government, and other regulated or risk-sensitive environments where unsupported tools can create too much uncertainty.
Learn more
Code Browser
Code Browser is a folding text editor for Linux and Windows, designed to hierarchically structure any kind of text file and especially source code. It makes navigation through source code faster and easier. Code Browser is especially designed to keep a good overview of the code of large projects, but is also useful for a simple CSS file. Ideal if you are fed up of having to scroll through thousands of lines of code. It supports syntax highlighting for all major languages and custom syntax highlighting can also be added. Although Code Browser was initially designed to edit programs, it can also be used for different tasks such as plain text outlining or helping to understand existing source code. I've added a page with suggestions to take advantage of folding.
Learn more
Caret
Based on the amazing Ace editing component, Caret brings professional-strength text editing to Chrome OS. With Caret, you no longer need to install a second OS to get what other platforms take for granted: a serious editor for local files, aimed at working programmers. Caret offers syntax highlighting for a wide variety of languages, and all of the standard themes that come with Ace, including emulations of coloring from other editors like Eclipse, XCode, and the Chrome Dev Tools. Once you've gotten used to making many changes with just a keystroke or two, it's hard to go back to just one cursor. Caret offers multiple cursors and selections, and support for Sublime keybindings like Ctrl-D (select next match). Why bother learning keyboard shortcuts? With the command palette (Ctrl-Shift-P), you can just start typing what you want, Caret will fuzzy-search the menu configuration, find the command you want, and execute it for you. You never need to touch the mouse again.
Learn more
Void Editor
Void is an open source AI code editor and Cursor alternative built as a fork of VS Code, enabling developers to write code with advanced AI assistance while retaining full control over their data. It supports seamless integration with any large language model, such as DeepSeek, Llama, Qwen, Gemini, Claude, and Grok, connecting directly without routing through a private backend. Core features include tab‑triggered autocomplete, inline quick edit, and a versatile AI chat interface offering normal chat, a restricted gather mode for read/search-only tasks, and an agent mode that automates file and folder operations, terminal commands, and MCP tool access. Void delivers high‑performance operations, including fast apply on files with thousands of lines, alongside checkpoint management for model updates, native tool execution, and lint error detection. Developers can transfer all themes, keybindings, and settings from VS Code in one click and host models locally or via the cloud.
Learn more
Pricing
Starting Price:
$195, one-time
Pricing Details:
Free for non-commercial use.
Free Version:
Free Version available.
Integrations
Company Information
Hackerman, Inc.
Founded: 2025
United States
koieditor.com
Videos and Screen Captures
Koi Editor Dual Pane Editing
Other Useful Business Software
Train ML Models With SQL You Already Know
Build and deploy ML models using familiar SQL. Automate data prep with built-in Gemini. Query 1 TB and store 10 GB free monthly.
Product Details
Platforms Supported
Mac
Training
Documentation
Support
Online
Koi Editor Frequently Asked Questions
Koi Editor Product Features
Text Editors
Auto-Complete
Supported
Code Folding
Supported
Column Editing
Supported
Customizable Themes
Supported
Keyboard Shortcuts
Supported
Multi-Monitor Editing
Supported
Syntax Highlighting
Supported
API
Not Supported
Debugging
Not Supported
Formatting / Table Editing
Not Supported
WYSIWYG
Not Supported
