Software Alternatives, Accelerators & Startups

Design Principles VS DevToolKit.site

Compare Design Principles VS DevToolKit.site and see what are their differences

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Design Principles logo Design Principles

An open source repository of design principles and methods

DevToolKit.site logo DevToolKit.site

19 free browser-based developer tools โ€” no signup, no tracking, everything runs client-side.
  • Design Principles Landing page
    Landing page //
    2023-06-17
  • DevToolKit.site Landing page
    Landing page //
    2026-02-14

DevToolKit is a collection of 19 free online developer tools that run entirely in the browser. No backend, no signup, no data ever leaves your machine. Built with Next.js 14 and Tailwind CSS. Tools include: JSON Formatter & Validator, JSON Tree Viewer with node path copying, YAML-JSON Converter, SQL Formatter, Base64 Encoder/Decoder (text + file drag & drop), URL Encoder, JWT Decoder, Hash Generator (SHA-1/256/384/512 via Web Crypto API), Password Generator, Cron Expression Parser with next run time calculation, PostgreSQL Config Generator (free PGTune alternative), UUID v4 Generator, QR Code Generator (PNG + SVG), Lorem Ipsum Generator, Regex Tester, Text Diff Checker, Unix Timestamp Converter, Color Converter (HEX/RGB/HSL), and HTTP Status Codes Reference. Every tool processes data locally using native browser APIs. No server-side processing, no cookies, no analytics tracking of input data.

Design Principles features and specs

  • Comprehensive Resource
    The website offers a wide collection of design principles from various companies and independent designers, providing a rich resource for learning and inspiration.
  • Diverse Perspectives
    The compilation includes principles from various industries and design philosophies, offering a well-rounded view of design thinking.
  • Easy to Navigate
    The site is well-organized and categorized, making it simple to find relevant design principles quickly.
  • Free Access
    The resource is available for free, making it accessible to anyone interested in design principles without any financial barrier.
  • Regularly Updated
    The collection is periodically updated with new content, ensuring users have access to the latest design thinking.

Possible disadvantages of Design Principles

  • Overwhelming Amount of Information
    The extensive collection of principles might be overwhelming for beginners who are just starting to learn about design.
  • Quality Variation
    Because the principles are sourced from various contributors, there is a variation in the quality and depth of the principles listed.
  • Lacks Interactivity
    The site mainly provides static information and lacks interactive elements that could enhance the learning experience.
  • No Community Features
    There are no built-in community features for users to discuss or collaborate on design principles, which could limit the exchange of ideas.
  • Sparse Context
    Some principles are presented without much context or explanation, which may make it difficult to understand their practical application.

DevToolKit.site features and specs

  • 100% Client-Side
    no data sent to any server
  • 19 Tools in One Place
    no jumping between sites
  • No Signup Required
    open and use instantly
  • Web Crypto API
    hardware-accelerated hashing and password generation
  • SEO-Optimized Tool Pages
    each tool has its own URL with metadata
  • Mobile Responsive
    works on phone and tablet
  • Dark Theme
    easy on the eyes for long coding sessions
  • PostgreSQL Config Generator
    free PGTune alternative
  • Cron Parser
    shows next 10 actual execution times
  • JSON Tree Viewer
    collapsible tree with click-to-copy node paths

Analysis of Design Principles

Overall verdict

  • Yes, Design Principles (principles.design) is a valuable and insightful resource for designers looking to enhance their understanding and application of design principles.

Why this product is good

  • Design Principles (principles.design) is a highly regarded resource that provides a comprehensive collection of well-crafted design principles from various successful companies and products. It offers insights into how these principles guide design decisions, resulting in user-friendly and aesthetically pleasing interfaces. The platform also allows designers to learn from industry leaders, adapting and applying proven frameworks to their own projects, thus improving the overall quality and effectiveness of their design work.

Recommended for

  • UI/UX designers
  • Product designers
  • Design students
  • Creative directors
  • Design educators
  • Anyone interested in understanding how effective design principles can enhance user experiences

Analysis of DevToolKit.site

Overall verdict

  • DevToolKit.site appears to be a useful collection of free online developer utilities that consolidates common tasks into one convenient, browser-based platform, though as with any third-party tool, users should verify its reliability and privacy practices for sensitive data.

Why this product is good

  • Provides a centralized suite of everyday developer tools (formatters, converters, encoders/decoders, generators) in one place
  • Browser-based access means no installation or setup is required
  • Typically free to use, lowering the barrier for quick tasks
  • Saves time by eliminating the need to search for individual single-purpose tools
  • Convenient for quick one-off conversions, formatting, and testing during development

Recommended for

  • Web and software developers needing quick access to formatting and conversion utilities
  • Students and beginners learning to code who want free, easy-to-use tools
  • Professionals handling occasional data encoding, decoding, or JSON/XML formatting tasks
  • Teams looking for lightweight browser-based utilities without installing software
  • Anyone needing fast, one-off developer tasks without dedicated applications

Design Principles videos

GOTO 2016 โ€ข Secure by Design โ€“ the Architect's Guide to Security Design Principles โ€ข Eoin Woods

DevToolKit.site videos

No DevToolKit.site videos yet. You could help us improve this page by suggesting one.

Add video

Category Popularity

0-100% (relative to Design Principles and DevToolKit.site)
Design Tools
100 100%
0% 0
Developer Tools
0 0%
100% 100
Prototyping
100 100%
0% 0
Text Tools
0 0%
100% 100

Questions & Answers

As answered by people managing Design Principles and DevToolKit.site.

Why should a person choose your product over its competitors?

DevToolKit.site's answer:

DevToolKit runs 100% in the browser with zero signup. Unlike CyberChef, which has a steep learning curve with its recipe-based interface, DevToolKit gives you 19 standalone tools โ€” each with a clean, focused UI for a single task. Unlike DevToys, it works on any device with a browser โ€” no desktop app installation needed. And unlike SmallDevTools or similar online toolkits, DevToolKit includes unique tools like a PostgreSQL Config Generator (a free PGTune alternative), a Cron Expression Parser that calculates next 10 actual run times, and a JSON Tree Viewer with click-to-copy node paths. Every tool uses native browser APIs like Web Crypto for hashing โ€” no data is ever sent to a server, which matters if you're working with production JWTs, API keys, or database configs.

How would you describe the primary audience of your product?

DevToolKit.site's answer:

Backend and full-stack developers who deal with JSON, JWTs, SQL, cron jobs, and PostgreSQL configuration on a daily basis. DevOps engineers who need quick encoding, hashing, or regex testing without installing CLI tools. Developers who care about data privacy and don't want to paste production tokens or API responses into random websites that may log input data.

What's the story behind your product?

DevToolKit.site's answer:

I'm a backend developer with 10+ years of experience in Python and Go, working on distributed systems and microservices. Every day I was jumping between 5-6 different sites to format JSON, decode a JWT, test a regex, or convert a timestamp โ€” each one bloated with ads, cookie banners, and signup walls. One evening I decided to build all the tools I actually use into a single place where everything runs client-side. The first version had 15 tools and took a weekend to build with Next.js and Tailwind CSS. After getting feedback, I added a PostgreSQL Config Generator (because PGTune hasn't been updated in years), a JSON Tree Viewer, and an HTTP Status Code Reference. It's now at 19 tools and growing based on what developers ask for.

Which are the primary technologies used for building your product?

DevToolKit.site's answer:

Next.js 14 with App Router for server-side rendering and per-page SEO metadata. Tailwind CSS for styling with a custom dark theme. Web Crypto API (crypto.subtle) for SHA-1/256/384/512 hashing and cryptographically secure password generation โ€” zero external crypto libraries. FileReader API for client-side Base64 file encoding. All tools are React components with no backend โ€” the entire app is static and deployed on Vercel. Each tool is a separate route with its own metadata, canonical URL, and sitemap entry for independent Google indexing.

Who are some of the biggest customers of your product?

DevToolKit.site's answer:

DevToolKit is a free tool with no accounts, so we don't track individual users. It's used by individual developers and small teams who need quick, private access to common dev utilities without enterprise overhead. The tool is designed for anyone who works with APIs, databases, or web development and wants a fast, ad-free, privacy-respecting alternative to existing online tools.

What makes your product unique?

DevToolKit.site's answer:

Three things set DevToolKit apart. First, it includes tools you won't find in other online toolkits โ€” a PostgreSQL Config Generator that replaces PGTune with hardware-aware tuning calculations, a Cron Expression Parser that doesn't just describe the schedule but calculates the next 10 actual execution timestamps, and a JSON Tree Viewer where you click any node to copy its full JavaScript path like data.users[0].email. Second, every tool uses native browser APIs instead of external libraries โ€” hashing runs through Web Crypto API with hardware acceleration, passwords use crypto.getRandomValues(), file encoding uses FileReader โ€” meaning zero dependencies and zero data transmission. Third, each of the 19 tools lives on its own URL with dedicated SEO metadata, so you can bookmark devtoolkit.site/jwt-decoder/ and go straight to it โ€” no navigating through menus or loading tools you don't need.

User comments

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Social recommendations and mentions

Based on our record, Design Principles seems to be more popular. It has been mentiond 9 times since March 2021. We are tracking product recommendations and mentions on various public social media platforms and blogs. They can help you identify which product is more popular and what people think of it.

Design Principles mentions (9)

  • Meaningful distinction between heuristics and principles?
    Your comment is an interesting one, and I can see how itโ€™s be helpful for some folks who are just setting out in their careers. I was asking not about style guides, but the nuanced differences between heuristics, such as NNgโ€™s, and design principles for decision-making: https://principles.design/. Source: almost 4 years ago
  • I Found 15 Free Resources For Entrepreneurs To Help Them with Social Media, SEO and Growth!
    Principle Design is a Free Resource to learn more about designing better user interfaces and logos for your business. Access 195+ Examples and 1445 principles to learn more about design. (no-signup). Source: almost 4 years ago
  • The importance of having a design system
    Http://styleguides.io/ and https://principles.design/ are worth keeping an eye on, especially for trends that come up and to see what the industry is up to. Source: almost 4 years ago
  • The importance of having a design system
    Https://principles.design/ (collection, guiding ethos). Source: almost 4 years ago
  • Ask HN: How do you design good primitives?
    Https://paperform.co/blog/principles-of-design/ https://principles.design/ https://99designs.com/blog/tips/principles-of-design/. - Source: Hacker News / about 4 years ago
View more

DevToolKit.site mentions (0)

We have not tracked any mentions of DevToolKit.site yet. Tracking of DevToolKit.site recommendations started around Feb 2026.

What are some alternatives?

When comparing Design Principles and DevToolKit.site, you can also consider the following products

Atlassian Design - Design, develop, and deliver

DuskTools.app - 150+ free browser-based developer tools - no sign-up, no tracking, no backend. JSON formatter, Base64 encoder, regex tester, JWT decoder, UUID generator, HTTP status lookup, MIME types, port reference, cron builder & more. Everything runs locally in

Facebook Design - Resources for Designers from the Facebook Design team

DevToys - A collection of converters, formaters, encoders, generators and other tools for your Windows desktop.

Checklist Design - The best UI and UX practices for production ready design.

CodeUtil.dev - Fast, private developer tools in your browser. JSON formatter, Regex tester, Cron generator, and 17 more.