--- title: "DevKit: JSON, JWT & Dev Tools - Reviews, Revenue and Downloads in United States | Apple App Store" description: "DevKit puts 30 developer utilities in your pocket — and every one runs entirely on your device. Stop juggling browser tabs. Stop pasting production tokens into random websites. Format JSON, decode a " --- # DevKit: JSON, JWT & Dev Tools — United States > Offline Formatter & Debugger ![DevKit App Icon](https://is1-ssl.mzstatic.com/image/thumb/Purple211/v4/2c/c9/0d/2cc90d2c-4d6f-d630-2e84-1641edf171dd/AppIcon-0-0-1x_U007epad-0-1-85-220.png/434x0w.png) **Developer:** [Alexander Herdt](https://apptail.io/developer/alexander-herdt-GYTyfb) **Category:** Developer Tools **Rating:** 5.0/5 (3 ratings) **Price:** Free **Bundle ID:** app.devkitpro.ios **Store:** Apple App Store **Country:** United States **Version:** 1.0.7 (released 2026-07-23) **Original Release:** 2025-11-28 **Languages:** English **App Store Link:** [Download on Apple App Store](https://apps.apple.com/us/app/app/id6754946567) **AppTail Page:** [https://apptail.io/app/devkit-json-jwt-dev-tools-syBx/united-states](https://apptail.io/app/devkit-json-jwt-dev-tools-syBx/united-states) ## DevKit Description DevKit puts 30 developer utilities in your pocket — and every one runs entirely on your device. Stop juggling browser tabs. Stop pasting production tokens into random websites. Format JSON, decode a JWT, test a regex, or convert a timestamp on a train, on a plane, or inside a locked-down corporate network. YOUR WORK STAYS ON YOUR DEVICE > Every tool runs locally. The JSON you paste, the token you decode, the certificate you inspect — none of it is uploaded to a server, and none of it is visible to us. > All 30 tools work with no internet connection. > No account, no sign-up, no email required. FORMATTERS > JSON Formatter: Beautify or minify JSON with error highlighting and tree view > HTML Formatter: Beautify, minify, and preview HTML with live rendering > CSS Formatter: Format and validate CSS with syntax highlighting > JS Formatter: Format and minify JavaScript > XML Formatter: Format and validate XML documents > SQL Formatter: Format and validate SQL queries PARSERS & DEBUGGERS > JWT Debugger: Decode tokens, inspect headers and payloads, verify signatures > Cron Parser: Parse cron expressions with next run calculations > Certificate Decoder: Decode X.509 certificates ENCODERS & DECODERS > Base64: Encode and decode Base64 strings > URL Encoder: Encode, decode, and parse URLs > HTML Encoder: Handle HTML entities > Hash Generator: Generate MD5, SHA-1, SHA-256, SHA-512 hashes > Backslash Escape: Escape and unescape special characters CONVERTERS > Timestamp: Convert Unix epoch timestamps to readable dates > Case Converter: Transform between camelCase, snake_case, UPPER CASE, and more > Color Converter: Convert between HEX, RGB, HSL with live preview > YAML to JSON: Convert between YAML and JSON with tree view > Number Base: Convert between Binary, Octal, Decimal, Hexadecimal > Hex to Text: Convert between hex and ASCII > CSV to JSON: Convert between CSV and JSON GENERATORS > UUID/ULID Generator: Create UUIDs and ULIDs instantly > QR Code: Generate customizable QR codes and export as images > Lorem Ipsum: Generate placeholder text > Random String: Generate secure passwords and API keys TEXT & COMPARISON > Diff Checker: Compare text with highlighted differences > RegEx Tester: Test regex with live match highlighting > Markdown Previewer: Preview Markdown with GitHub Flavored support > Line Sort: Sort and deduplicate lines > String Inspector: Analyze string statistics BUILT FOR MOBILE > Smart History: Auto-saves recent work, stored only on your device > Instant Paste: Smart clipboard detection > Quick Actions: One-tap copy, clear, share > Native Performance: Blazing fast, no loading screens > Light & Dark Modes: Beautiful design for any environment WHO IT'S FOR > Software engineers debugging away from a desk > Site reliability engineers checking cron schedules and certificates during an incident > Backend developers inspecting tokens and payloads > Engineering managers reviewing a diff or a config between meetings > Anyone who needs dev tools without a network PRICING Pro: $9.99/month or $39.99/year (save 67%) 3-day free trial. Cancel anytime. WHY DEVKIT > Works with no connection > Your work never leaves the device > Fast, native performance > Regular updates with new tools > No ads, ever > Built by a developer, for developers Download DevKit and take your tools anywhere. Terms of Use: Apple's Standard EULA ( ## DevKit Screenshots - [Screenshot 1](https://is1-ssl.mzstatic.com/image/thumb/PurpleSource211/v4/60/34/d9/6034d94f-70f1-9302-f0e3-4a8ad1e47269/image1.png/1290x2796.png) - [Screenshot 2](https://is1-ssl.mzstatic.com/image/thumb/PurpleSource221/v4/8c/f6/bf/8cf6bfdf-6bde-a188-3a87-f85ba1ac1784/image2.png/1290x2796.png) - [Screenshot 3](https://is1-ssl.mzstatic.com/image/thumb/PurpleSource221/v4/32/ac/30/32ac3045-fa62-a589-176f-63fb74039740/image3.png/1290x2796.png) - [Screenshot 4](https://is1-ssl.mzstatic.com/image/thumb/PurpleSource211/v4/29/19/22/2919229b-d76e-005b-2181-1d0efda5c3d8/image4.png/1290x2796.png) - [Screenshot 5](https://is1-ssl.mzstatic.com/image/thumb/PurpleSource221/v4/bc/f2/1e/bcf21ed1-47a1-fe52-b5e2-2a5ed029c8f3/image5.png/1290x2796.png) - [Screenshot 6](https://is1-ssl.mzstatic.com/image/thumb/PurpleSource211/v4/c0/6c/ea/c06cea62-af9c-1402-29ac-d24aabacab7e/image6.png/1290x2796.png) - [Screenshot 7](https://is1-ssl.mzstatic.com/image/thumb/PurpleSource211/v4/8f/1a/9d/8f1a9d8c-d787-f101-d2f3-dc105e44371c/image7.png/1290x2796.png) - [Screenshot 8](https://is1-ssl.mzstatic.com/image/thumb/PurpleSource211/v4/cf/f7/72/cff77257-b739-e3fa-72d2-6594674f6f03/image8.png/1290x2796.png) - [Screenshot 9](https://is1-ssl.mzstatic.com/image/thumb/PurpleSource221/v4/13/37/f1/1337f16c-5805-c4ab-c170-4df52795cd96/image9.png/1290x2796.png) - [Screenshot 10](https://is1-ssl.mzstatic.com/image/thumb/PurpleSource221/v4/96/f4/22/96f42251-480b-1cab-7fb1-1db84edb623d/image10.png/1290x2796.png) ## DevKit Rating Breakdown in United States - 5 stars: 3 (100%) - 4 stars: 0 (0%) - 3 stars: 0 (0%) - 2 stars: 0 (0%) - 1 stars: 0 (0%) ## DevKit Reviews in United States ### ***** "DevKit" Amazing app for devs that are always on call, thank you -- Jaiired, 2026-07-17 [View all DevKit reviews and detailed analytics on AppTail](https://app.apptail.io/signup?utm_campaign=ai-crawl&utm_content=reviews) ## DevKit In-App Purchases | Item | Price | |------|-------| | Pro Yearly | $39.99 | | Pro Monthly | $9.99 | ## Apps Similar to DevKit - [Developer Tools: Exabox](https://apptail.io/app/developer-tools-exabox-RDtk/united-states) - [DevBox - Toolbox for Developer](https://apptail.io/app/devbox-toolbox-for-developer-HJXq/united-states) - [DevList - Developer Directory](https://apptail.io/app/devlist-developer-directory-YHcr/united-states) - [Developer-Tools](https://apptail.io/app/developer-tools-mOjv/united-states) - [Hackertab](https://apptail.io/app/hackertab-AbMv/united-states) - [DevPocket – Developer Toolkit](https://apptail.io/app/devpocket-developer-toolkit-ogiw/united-states) - [Dev Tool box - 개발자 도구](https://apptail.io/app/dev-tool-box-cAxw/united-states) - [DevTools+: Dev Tools & Code](https://apptail.io/app/devtools-dev-tools-code-tBEy/united-states) - [DevGear - Developer utilities](https://apptail.io/app/devgear-developer-utilities-eHLy/united-states) - [DevForge - Developer Tools](https://apptail.io/app/devforge-developer-tools-tGVy/united-states) ## DevKit Available In - [United States](https://apptail.io/app/devkit-json-jwt-dev-tools-syBx/united-states) - [Belgium](https://apptail.io/app/devkit-json-jwt-dev-tools-syBx/belgium) - [Canada](https://apptail.io/app/devkit-json-jwt-dev-tools-syBx/canada) - [China](https://apptail.io/app/devkit-json-jwt-dev-tools-syBx/china) - [Germany](https://apptail.io/app/devkit-json-jwt-dev-tools-syBx/germany) - [United Kingdom](https://apptail.io/app/devkit-json-jwt-dev-tools-syBx/united-kingdom) - [Hong Kong SAR China](https://apptail.io/app/devkit-json-jwt-dev-tools-syBx/hong-kong) - [Croatia](https://apptail.io/app/devkit-json-jwt-dev-tools-syBx/croatia) - [Indonesia](https://apptail.io/app/devkit-json-jwt-dev-tools-syBx/indonesia) - [Ireland](https://apptail.io/app/devkit-json-jwt-dev-tools-syBx/ireland) - [Iceland](https://apptail.io/app/devkit-json-jwt-dev-tools-syBx/iceland) - [South Korea](https://apptail.io/app/devkit-json-jwt-dev-tools-syBx/south-korea) - [Kazakhstan](https://apptail.io/app/devkit-json-jwt-dev-tools-syBx/kazakhstan) - [Mexico](https://apptail.io/app/devkit-json-jwt-dev-tools-syBx/mexico) - [Nigeria](https://apptail.io/app/devkit-json-jwt-dev-tools-syBx/nigeria) - [Oman](https://apptail.io/app/devkit-json-jwt-dev-tools-syBx/oman) - [Poland](https://apptail.io/app/devkit-json-jwt-dev-tools-syBx/poland) - [Portugal](https://apptail.io/app/devkit-json-jwt-dev-tools-syBx/portugal) - [Romania](https://apptail.io/app/devkit-json-jwt-dev-tools-syBx/romania) - [Russia](https://apptail.io/app/devkit-json-jwt-dev-tools-syBx/russia) - [Slovakia](https://apptail.io/app/devkit-json-jwt-dev-tools-syBx/slovakia) - [Türkiye](https://apptail.io/app/devkit-json-jwt-dev-tools-syBx/turkey) - [Ukraine](https://apptail.io/app/devkit-json-jwt-dev-tools-syBx/ukraine) - [Australia](https://apptail.io/app/devkit-json-jwt-dev-tools-syBx/australia) - [Vietnam](https://apptail.io/app/devkit-json-jwt-dev-tools-syBx/vietnam) --- ## About AppTail [AppTail](https://apptail.io) is a mobile app intelligence platform providing app analytics, ASO (App Store Optimization) tools, keyword tracking, competitor analysis, revenue estimates, and review monitoring for iOS App Store apps. Track your app's performance, discover ranking keywords, monitor competitors, and analyze market trends. - [Search Apps](https://apptail.io) - [Top Charts](https://apptail.io/top-iphone-apps) - [Sign Up for Full Access](https://app.apptail.io/signup?utm_campaign=ai-crawl&utm_content=footer) *Data provided by [AppTail](https://apptail.io) - Mobile App Intelligence Platform*