LeetCode
HackerRank
Project Euler
Codewars
CodeForces
Exercism
interviewing.io
Coderbyte
Aether Tool
Hasare
IT Tools
Ahrefs
DevToys
FreeToolkit
10015.io
JSON 44
Free 55+ developer tools โ JSON formatter, PHP obfuscator, code beautifier, QR generator, hash tools & more. No signup, no limits.
LeetCode
Aether ToolAether Tool's answer:
Aether Tool consolidates over 50+ essential developer utilities into a single, lightning-fast, and minimalist web interface. Unlike other platforms that fragment tools across multiple sites or bury them under premium paywalls, Aether Tool provides everythingโfrom JWT decoding and JSON formatting to CSS generation and SVG optimizationโin one unified, frictionless experience.
Aether Tool's answer:
Speed and an absolute lack of friction. Most competitors clutter their tools with aggressive advertisements, require account registrations, or hide essential features behind paid subscriptions. Aether Tool is 100% free, requires zero sign-ups, loads instantly, and respects user privacy. Itโs built purely for developers who want to get the job done quickly without distractions.
Aether Tool's answer:
Aether Tool is built using modern web technologies to ensure fast performance. The frontend leverages lightweight JavaScript and optimized CSS for a highly responsive UI. Many of the tools run entirely client-side for maximum privacy and zero-latency execution, ensuring sensitive data (like passwords or tokens) never leaves the user's browser.
Aether Tool's answer:
The primary audience includes web developers (both frontend and backend), software engineers, system administrators, UI/UX designers, and technical SEO specialists. It is also highly valuable for computer science students and indie hackers who need quick, reliable utilities for daily coding and formatting tasks.
Aether Tool's answer:
Aether Tool was born out of pure developer frustration. I was tired of having 15 different websites just to format a JSON file, test a Regex pattern, generate a secure UUID, and compress an SVG. Constantly googling for these disjointed, ad-heavy mini-tools broke my flow state. So, I decided to build the ultimate "Swiss Army knife" to house every essential utility in one clean, centralized, and fast platform.
Aether Tool's answer:
Since Aether Tool is a completely free, privacy-focused utility platform rather than enterprise B2B software, we don't track corporate client data.
LeetCode is the best platform to help people practice solving coding problems and prepare for technical interviews. The main users are software engineers. LeetCode has over 1,900 questions covering many different programming concepts.
Based on our record, LeetCode seems to be more popular. It has been mentiond 543 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.
Category Tool URL How I used it General AI assistant ChatGPT Https://chatgpt.com Breaking down concepts, simulating interviewers, reviewing answers AI writing / reasoning Claude Https://claude.ai Refining behavioral stories and system design explanations Coding practice LeetCode Https://leetcode.com Core DSA practice and timed coding drills Coding explanations NeetCode Https://neetcode.io Pattern-based... - Source: dev.to / about 1 month ago
Plain BST. Fine when input is random or the problem doesn't require worst-case guarantees. Tree problems on LeetCode typically assume balanced input and don't ask you to maintain balance yourself. - Source: dev.to / about 2 months ago
Your preparation should not be random. Platforms like LeetCode, Codeforces, and GeeksforGeeks are toolsโbut what matters is how you use them. - Source: dev.to / 2 months ago
Bash /path/to/chrome-launcher.sh email001@gmail.com https://leetcode.com. - Source: dev.to / 3 months ago
AI-Powered Learning Tools: Consider using AI-driven platforms like Khan Academy or LeetCode that can personalize your learning experience based on your progress and skill level. - Source: dev.to / 9 months ago
HackerRank - HackerRank is a platform that allows companies to conduct interviews remotely to hire developers and for technical assessment purposes.
Hasare - Free online developer tools that run 100% in your browser. JSON formatter, URL encoder/decoder, hash generator, diff checker, YAML converter, and more. Fast, secure, no data leaves your device.
Project Euler - Project Euler is a series of challenging mathematical/computer programming problems that will...
IT Tools - IT Tools is a free and open-source collection of handy online tools for developers & people working in IT.
Codewars - Achieve code mastery through challenge.
Ahrefs - Ahrefs is a toolset for SEO and marketing. We have tools for backlink research, organic traffic research, keyword research, content marketing & more. Give Ahrefs a try!