Dev Tool box - Developer Tools
JSON, URL, Base64 & More
Free
DevToolbox is an essential collection of developer utilities designed to streamline your coding workflow. Whether you're debugging APIs, encoding data, or formatting JSON, DevToolbox provides the tools you need in a clean, native interface.
KEY FEATURES:
• JSON Formatter & Validator
Format, validate, and beautify JSON with syntax highlighting. Tree view visualization for better structure understanding. Built-in search functionality to find text within large JSON files.
• URL Encoder/Decoder
Quickly encode or decode URLs for API testing and web development. RFC 3986 compliant encoding for maximum compatibility.
• Base64 Encoder/Decoder
Convert text to Base64 and vice versa. Supports URL-safe Base64 and auto-padding. Perfect for encoding credentials, tokens, and data URIs.
• JWT Decoder
Decode and inspect JSON Web Tokens without external services. View header, payload, and signature details instantly. Automatically handles "Bearer " prefix.
• Text Case Converter
Transform text between various cases: camelCase, PascalCase, snake_case, kebab-case, SCREAMING_SNAKE_CASE, dot.case, UPPERCASE, lowercase, and Title Case. Smart parsing for any input format.
• Hash Generator
Generate secure hashes using MD5, SHA-1, SHA-256, and SHA-512 algorithms. Essential for checksum verification and security testing.
• Unix Timestamp Converter
Convert between Unix timestamps and human-readable dates. Supports seconds and milliseconds. Multiple output formats including ISO 8601, UTC, and local time.
• Number Base Converter
Convert between Decimal, Binary, Octal, and Hexadecimal. Auto-detects input format with 0x, 0b, 0o prefix support.
• String Escape/Unescape
Escape special characters for JSON strings or unescape encoded text. Handles \n, \t, \", \\ and more.
• Color Converter
Convert HEX colors to RGB and HSL with live preview. Generates ready-to-use SwiftUI, UIKit, and CSS code snippets.
WHY DEVTOOLBOX?
• Native Performance: Built with SwiftUI for blazing-fast performance
• Privacy First: All processing happens locally on your device
• Universal App: Works seamlessly on iPhone, iPad, and Mac
• Dark Mode Support: Easy on the eyes during late-night coding sessions
• No Ads, No Tracking: Just pure functionality
• Offline Ready: No internet connection required
Perfect for mobile developers, web developers, API developers, QA engineers, security professionals, and students learning to code.
DevToolbox is your pocket-sized development companion. Stop switching between websites and online tools - get everything you need in one native app.
Ratings & Reviews
This app has not received enough ratings or reviews to display an overview.
What's New in This Version
New Developer Tools
• Unix Timestamp Converter
- Convert timestamps to human-readable dates and vice versa
- Supports both seconds and milliseconds formats
- Multiple output formats: ISO 8601, UTC, Local time
- Flexible date input parsing
• Number Base Converter
- Convert between Decimal, Binary, Octal, and Hexadecimal
- Auto-detects input format (0x, 0b, 0o prefixes)
- Clean, organized output for all number bases
• String Escape/Unescape
- Escape special characters for JSON strings
- Unescape encoded strings back to readable text
- Supports \n, \t, \", \\ and more
• Color Converter
- Convert HEX colors to RGB and HSL
- Live color preview
- Ready-to-use SwiftUI and UIKit code snippets
- CSS variable output
Enhanced Existing Tools
• Base64: Now handles URL-encoded input and auto-adds padding
• JWT Decoder: Automatically removes "Bearer " prefix
• URL Encoder: Stricter RFC 3986 compliant encoding
• Text Case: Added SCREAMING_SNAKE_CASE and dot.case formats
• Text Case: Now correctly parses camelCase and PascalCase input
• Hash Generator: Added SHA-512 output
Improved User Experience
• Colorful menu icons for better visual distinction
• Default example inputs for each tool
• Better error messages with supported format hints
The developer, Seonggon Sim, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy .
Data Used to Track You
The following data may be used to track you across apps and websites owned by other companies:
- Identifiers
Data Not Linked to You
The following data may be collected but it is not linked to your identity:
- Identifiers
Accessibility
The developer has not yet indicated which accessibility features this app supports. Learn More
Information
- Provider
- Seonggon Sim
- Size
- 4 MB
- Category
- Developer Tools
- Compatibility
Requires iOS 18.0 or later.
- iPhone
Requires iOS 18.0 or later. - iPad
Requires iPadOS 18.0 or later. - Mac
Requires macOS 15.0 or later. - Apple Vision
Requires visionOS 2.0 or later.
- Languages
- English
- Age Rating
4+
- 4+
- Copyright
- © Copyright 2025. SimSeonggon all rights reserved.