# Dev ToolBox > The ultimate offline developer multitool: 35+ fast coding & debugging utilities Canonical page: [https://chrome-stats.com/d/com.krystalinfo.developertool](https://chrome-stats.com/d/com.krystalinfo.developertool) ## Overview - **ID:** `com.krystalinfo.developertool` - **Platform:** Android - **Type:** Android app - **Status:** Available - **Publisher:** Krystal info - **Category:** TOOLS - **Downloads:** 27 - **Version:** 1.0.0 - **Last updated:** 2026-03-13 - **First published:** 2026-03-13 - **Publisher country:** IN - **Size:** 23 MB - **Data as of:** 2026-09-14 - **Store listing:** [Google Play Store](https://play.google.com/store/apps/details?id=com.krystalinfo.developertool) - **Website:** [https://krystalinfoo.blogspot.com/](https://krystalinfoo.blogspot.com/) - **Privacy policy:** [https://krystalinfoo.blogspot.com/p/privacy-policy-for-developer-tool-box.html](https://krystalinfoo.blogspot.com/p/privacy-policy-for-developer-tool-box.html) ## Description Supercharge Your Development Workflow!

Say goodbye to bookmarking dozens of websites for simple formatting, encoding, or generating tasks. Dev ToolBox is the ultimate all-in-one utility app built for coders, testers, and designers.

Whether you need to quickly format JSON, decode a JWT, test a Regex pattern, or generate a UUID, this app brings over 35 essential developer tools straight to your pocket. The best part? It works 100% offline, meaning your data stays secure on your device and you get lightning-fast results without needing an internet connection.

🛠️ Included Tools & Utilities:

Formatters & Parsers

JSON Formatter: Beautify or minify JSON strings instantly.

SQL Formatter: Clean up complex SQL queries.

XML Formatter: Format and validate XML data.

YAML to JSON: Seamlessly convert YAML files into JSON format.

Encoders & Decoders

Base64 Encoder/Decoder: Safely encode or decode text and data.

URL Encoder/Decoder: Prepare URLs for safe web transmission.

HTML Entity Coder: Encode or decode HTML entities safely.

JWT Decoder: Inspect JSON Web Tokens without pasting them online.

Generators & Security

SHA Hash Generator: Generate secure SHA-1, SHA-256, SHA-512 hashes.

UUID Generator: Create unique version 4 UUIDs on the fly.

QR Generator: Convert text, links, or data into scannable QR codes.

Lorem Ipsum Generator: Generate placeholder text for your UI designs.

Web & Design Tools

Color Converter: Convert seamlessly between HEX, RGB, HSL, and more.

CSS Unit Converter: Translate PX to REM, EM, VW, and VH effortlessly.

Aspect Ratio Calculator: Calculate exact dimensions for images and video.

Case Converter: Switch text between camelCase, snake_case, PascalCase, etc.

Text & Code Utilities

Regex Tester: Test and debug your regular expressions in real-time.

Text Diff Checker: Compare two blocks of text or code to find changes.

Markdown Preview: Write and preview Markdown files instantly.

String Inspector: Count characters, words, bytes, and analyze text.

System & Time

Unix Timestamp: Convert epochs to human-readable dates and vice versa.

Cron Expression: Parse and understand complex cron schedules.

Base Converter: Convert numbers between binary, octal, decimal, and hex.

Display Info: Check your device's screen resolution, density, and refresh rate.

...plus 10+ more tools designed to make your daily coding tasks easier!

🔒 Why Choose Dev ToolBox?

100% Offline & Private: No server calls. Your code and data never leave your device.

Blazing Fast: Native performance means no waiting for web pages to load.

Lightweight: Packed with features but takes up minimal space on your phone.

No Distractions: A clean, developer-focused UI designed for getting things done.

Simplify your workflow and carry your essential tools wherever you go. Download Dev ToolBox today! ## Rankings - #2,492,957 — Overall ## Permissions and access ### Permissions - `android.permission.ACCESS_ADSERVICES_AD_ID` - `android.permission.ACCESS_ADSERVICES_ATTRIBUTION` - `android.permission.ACCESS_ADSERVICES_TOPICS` - `android.permission.ACCESS_NETWORK_STATE` - `android.permission.FOREGROUND_SERVICE` - `android.permission.INTERNET` - `android.permission.WAKE_LOCK` - `com.android.vending.CHECK_LICENSE` - `com.google.android.gms.permission.AD_ID` - `com.krystalinfo.developertool.DYNAMIC_RECEIVER_NOT_EXPORTED_PERMISSION` ## Similar extensions and apps - [Dev Tools](https://chrome-stats.com/d/com.solodevdoc.devtools) — 639 users - [Dev Tool box - Developer Tools](https://chrome-stats.com/d/com.gonigon.devtoolbox) — 110 users - [CodeToolbox](https://chrome-stats.com/d/app.lovable.devtoolbox) — 27 users - [DevToolKit: Developer Tools](https://chrome-stats.com/d/com.ilyas.ilyasapps.devtoolkit) — 39 users - [DevBuddy: Offline Dev Toolkit](https://chrome-stats.com/d/com.cosmovex.devbuddy) — 478 users - [Dev Toolbox](https://chrome-stats.com/d/com.debugentity.devtoolbox) — 6 users - [JSON Formatter & Dev Tools](https://chrome-stats.com/d/ts.hexabytes.devtoolkit) — 43 users - [Developer Tools & JSON Editor](https://chrome-stats.com/d/com.developertools.jsonvalidator) — 127 users - [DevTools+: Developer Tools](https://chrome-stats.com/d/com.toshsoft.devtools) — 142 users - [DevToolbox](https://chrome-stats.com/d/com.toros.devtool) — 71 users - [DevSuite - Developer Tools Kit](https://chrome-stats.com/d/com.vk.timemachine) — 210 users - [Dev Tools: JSON, JWT & Regex](https://chrome-stats.com/d/com.zakariae1995.Devtools) — 156 users --- Source: [Chrome-Stats](https://chrome-stats.com/d/com.krystalinfo.developertool)