Simple

Simple Apps

A collection of simple, focused macOS utilities.

Built with native Swift and SwiftUI. Each app is ~2 MB — the Electron equivalent would be 80–120 MB. Your disk space is safe here.

Viewer Toolbox

A macOS menu bar app that manages all viewer apps, shared settings, and keeps everything up to date. Each viewer app below is free — the Toolbox is a paid app that makes it easy to install, update, and manage them all from one place.

Viewer Toolbox screenshot

Buy on Gumroad — $9.99 Buy on App Store — $9.99 v1.8.0

Features

Quick access to all viewer apps from the menu bar
Install, update, and launch viewers in one place
Shared settings: font, theme, and editor preferences sync across all viewers
Automatic updates via Sparkle

TextViewer

A simple, native macOS app for viewing plain text and code files with syntax highlighting.

Download TextViewer for free v1.5.0

Requirements

macOS 13.0 or later
Universal binary (Intel + Apple Silicon)

Features

Syntax highlighting for many languages
Line numbers and word wrap
Configurable font and theme
Light/dark mode support

Installation

Download and open the DMG
Drag TextViewer to your Applications folder

JSONViewer

A simple, native macOS app for viewing JSON files — like Preview for images, but for .json and .jsonl files.

Download JSONViewer for free v1.9.0

Requirements

macOS 13.0 or later
Universal binary (Intel + Apple Silicon)

Features

Syntax highlighting: color-coded keys, strings, numbers, booleans, and null values
Expand/collapse objects and arrays with click
Error detection with line highlighting for invalid JSON
One-click copy to clipboard
Light/dark mode support

Installation

Download and open the DMG
Drag JSONViewer to your Applications folder

MarkdownViewer

A simple, native macOS app for viewing Markdown files — like Preview for images, but for .md files.

Download MarkdownViewer for free v1.12.0

Requirements

macOS 13.0 or later
Universal binary (Intel + Apple Silicon)

Features

Full Markdown support: headers, bold, italic, links, code blocks, lists, tables, images, strikethrough, task lists
Syntax highlighting for fenced code blocks
Export as PDF
Dark mode support
Open files via File menu, double-click, or drag & drop
Copy raw Markdown or formatted rich text

Installation

Download and open the DMG
Drag MarkdownViewer to your Applications folder

3DViewer

A simple, native macOS app for viewing 3D model files — like Preview for images, but for 3D models.

Download 3DViewer for free v1.7.0

Requirements

macOS 13.0 or later
Universal binary (Intel + Apple Silicon)

Features

Multiple format support: STL, OBJ, USDZ, PLY, and DAE files
Interactive controls: orbit, pan, and zoom
Wireframe mode toggle for inspecting model structure
Auto-centering and scaling for optimal viewing
Grid floor for spatial reference
Light/dark mode support

Installation

Download and open the DMG
Drag ThreeDViewer to your Applications folder

YAMLViewer

A simple, native macOS app for viewing YAML files with syntax highlighting and validation.

Download YAMLViewer for free v1.7.0

Requirements

macOS 13.0 or later
Universal binary (Intel + Apple Silicon)

Features

Syntax highlighting for YAML
Validation with error reporting
Configurable font and theme
Light/dark mode support

Installation

Download and open the DMG
Drag YAMLViewer to your Applications folder

CSVViewer

A simple, native macOS app for viewing CSV and TSV files in a clean table format.

Download CSVViewer for free v1.5.0

Requirements

macOS 13.0 or later
Universal binary (Intel + Apple Silicon)

Features

Table view for CSV and TSV data
Column sorting and resizing
Configurable font and theme
Light/dark mode support

Installation

Download and open the DMG
Drag CSVViewer to your Applications folder

App Sizes

Each viewer is a tiny, native macOS app — no Electron bloat.

App	Size
JSONViewer	1.0 MB
3DViewer	1.4 MB
TextViewer	1.8 MB
MarkdownViewer	1.8 MB
ImageViewer	2.1 MB
CSVViewer	2.2 MB
AudioViewer	2.3 MB
YAMLViewer	2.4 MB
3MFViewer	2.6 MB