Yesterday's Top Launches: 1 Tools from September 5, 2026
CodeLook is a new macOS Quick Look extension that replaces the default plain-text preview of source files with syntax-highlighted views that match your editor's theme.
Yesterday’s new developer tools lineup was compact, with one launch standing out on September 5. CodeLook is a Quick Look extension for macOS that wants to rescue developers from an annoyance most of us have silently accepted for years: the flat, unstyled text preview that appears when you press Space on a source file.
It sounds minor until you’ve lived with it. For anyone who spends their day in a themed editor, the default Quick Look rendering is a jarring break in the flow of browsing files. CodeLook replaces that plain-text view with syntax-highlighted previews that match your editor’s look and feel, with no need to open the actual file.
CodeLook: previews that finally look like your editor
Press Space on any file in Finder and macOS shows you a preview through Quick Look. For images, PDFs, and documents, that preview is genuinely polished. For code files, it has always been a letdown. You get a bare text dump that ignores colors, fonts, and line structure. The utility is real, but the result feels unfinished, especially if you live in VSCode, Zed, or Neovim where every token has a color and a purpose.
CodeLook slots into that gap as a system extension rather than a traditional app. You install it, launch it once to enable the extension in System Settings under Login Items & Extensions, and then it quietly does its job across the entire system. Finder, Spotlight, Open and Save dialogs, and any third-party app that uses the Quick Look framework, including Raycast, all get the upgraded previews. You can quit the app afterward and the extension keeps working. That is the right architecture for a tool like this.
The first major feature area is theming. Every pixel of the preview comes from the selected theme, not just the text color. Background, gutter, line numbers, and the separator all render in the theme’s palette, which is what makes the preview look like a real editor instead of a highlighted text file wearing a costume. CodeLook ships with over 700 themes from Zed’s public extension registry, installable with one click. If you prefer something custom, you can build your own theme using Zed’s theme builder or write a simplified JSON file with documented token mappings. Optional line numbers and word wrap controls round out the display settings.
There is also a dual-theme appearance mode. You pick a dark theme and a light theme, and System mode switches between them automatically based on your macOS appearance. This matters more than it might seem. If you use dark mode at night and light mode during the day, your code previews follow along without any manual toggling. Small touches like this make the extension feel like it was designed by someone who actually uses macOS rather than ported over from another platform.
Font handling gets similar attention. You can choose any font installed on your Mac and set a custom size, and CodeLook renders regular, bold, italic, and bold italic text as needed. That means the preview can match the typeface you already use in your editor. It sounds like a minor detail, but when you preview code dozens of times a day, consistency adds up.
Performance is where many similar attempts fall apart, and CodeLook seems to take this seriously. The engine is written natively in Swift and powered by Tree-sitter grammars, with streaming rendering for large files. The developer claims there’s no file size limit, and the site demonstrates a 260,000-line C file fully highlighted down to line 260,494. Files appear highlighted the moment you press Space, with no loading spinner for big files. That is an impressive technical outcome.
Accuracy comes from real parsing rather than pattern matching. CodeLook uses the same Tree-sitter grammars that power Zed and Neovim, so every token is colored based on its actual role in the language grammar, not based on guesswork. Tricky syntax like Swift regex literals gets handled correctly. Supported formats include Rust, C, C++, Swift, Go, Ruby, Python, CSS, JavaScript, JSX, TSX, Shell, Lua, JSON, JSONC, JSONL, and YAML.
One honest caveat: 17 file types is a respectable list, but it has gaps. Java, PHP, Kotlin, and C# are absent. If you work mainly in those languages, CodeLook won’t change your preview experience yet. The supported grammar list is worth checking before you buy.
Privacy is refreshingly explicit for a tool that reads local source files. CodeLook collects no data, has no analytics, no tracking, and no accounts. Files are read locally and never leave your Mac. The only network requests are the theme catalog and theme downloads you initiate. The full privacy policy fits on a single page.
Pricing sits at $4.99 one-time on the Mac App Store. No subscription, no in-app purchases. For a utility you trigger dozens of times a day, that feels fair. But I can also imagine developers who only occasionally browse raw code files deciding this is a nice-to-have rather than a need-to-have.
CodeLook is brand new, so it has no community ranking data yet. The early pitch clearly targets developers who use modern editors like Zed and Neovim, leaning on that extension registry connection. That said, the broader audience of anyone who handles source files in Finder or open dialogs will find value here too. Yesterday’s launch was a single-product day, but this one is aimed precisely at a problem that has gone unaddressed for too long on macOS.