DEV Community: Pranay Mokal

I build interview, certification and exam preparation app with Google Gemini Pro – No Login, No Limits, https://certifystacks.netlify.app/

Pranay Mokal — Mon, 13 Jul 2026 06:30:57 +0000

While preparing for a certification exam, I got tired of the same pattern everywhere:Solve 5–10 questions

“Create an account or upgrade to continue”

I just wanted to practice without friction. So instead of complaining, I built CertifyStacks — a completely free, privacy-first mock test platform. certifystacks.netlify.appWhy I Made ItI wanted something simple, fast, and actually useful:Choose your own test size (because not everyone has an hour — sometimes you only have 10–15 minutes)
No accounts, no tracking, no data collection
100% client-side — your progress and answers stay in your browser
Works offline after the first load
Built as a static site, so it can handle a lot of traffic without breaking the bank

How It Was BuiltDay 1 → I built the entire frontend and quiz engine with Google Gemini Pro.
Day 2 → Added multiple test papers.That’s it. No complex backend, no database, no user management. Just clean, vanilla-ish web tech that gets the job done.Even though I couldn’t attend the certification I was preparing for, I decided to release this anyway. I believe it can help students, job seekers, working professionals, and anyone who loves learning and testing their knowledge.What Makes It DifferentPrivacy-first: Nothing leaves your browser
Flexible: Pick 10, 20, or 50 questions depending on your time
Lightweight & Fast: Static hosting on Netlify = blazing fast and scalable
No paywalls: Ever

Of course, like any community-driven or AI-assisted question bank, some questions may become outdated over time or spark healthy debate on answers. I’ll keep improving it gradually based on feedback.My AI-Powered Journey So FarThis is my second meaningful project built with AI assistance:FreeDevUtils – a collection of free developer tools
CertifyStacks – mock tests for certifications and exams

I’m already working on the third one, which I believe tackles one of the bigger challenges developers and learners face today.Final ThoughtSpending just 15 minutes a day solving questions can compound into massive knowledge gains over months. You don’t need fancy platforms or expensive subscriptions to stay consistent.If you’re preparing for any certification, technical interview, or just want to test your knowledge — give CertifyStacks a try and let me know what you think.Feedback, suggestions, or contributions are more than welcome!Try it here:

https://certifystacks.netlify.app

javascript #webdev #education #productivity #ai #opensource #freecode #certification

I built 70+ Developer tools with github copilot & Google gemini pro for developer community https://freedevutils.github.io

Pranay Mokal — Wed, 03 Jun 2026 18:28:14 +0000

This is a submission for the GitHub Finish-Up-A-Thon Challenge

What I Built

This project began as a small collection of developer tools within my personal portfolio on January 10, 2026. Over time, I decided to make it publicly available for the entire developer community and made it public on 18-05-2026 with 52 tools since then added 14 more.
This is my small contribution to the developer community, and in turn, a contribution to society directly or indirectly.

Today, it has grown into a comprehensive collection of 65+ developer utilities designed to help developers with everyday tasks.

What makes it different?

More advanced features and improved tools.
No backend infrastructure.
No sign-up or login required.
Fully client-side application.
Free for everyone.
No rate limits.
100% secure you can also open n/w tab and check.
Tools gives lot but depending on your browser capacity.
Not just free for developers but for everyone around the globe.

Feedback, suggestions and any kind of contributions are always welcome.

What it contains ?
API & Network Tools
Restify **- Rest API Testing Tool
**Swagger/OpenAPI Viewer
Postman Collection Viewer
HAR File Explorer:
JWT Decoder:
Advanced IPv4 & IPv6 Subnet Calculator
SSL Certificate Checker
🏗️ Architecture & Diagramming -( i tried to preserve engineering discipline)
Architecture Diagram Builder
Entity Relationship Diagram Designer
UML Class Diagram Builder
Flowchart Diagram Designer
Docker Compose Visualizer

🔄 Data & Format Converters
JSON Pretty Print/Minify
XML Pretty Print
SQL Beautifier
CSV Viewer & Search
Format Converters: Switch seamlessly between formats using the CSV to JSON, JSON to CSV, YAML ↔ JSON, and XML ↔ JSON converters.
CSV To SQL: Convert CSV files into DDL/DML scripts for various databases.
Spring Boot Properties Converter
🔐 Security, Crypto & Encoders
Password Generators & Strength Testers:
Encryption Tools: Encrypt and decrypt text using the AES Encrypt/Decrypt and Advanced and legacy Jasypt Encrypt/Decrypt tools.
Hashing & Checksums (MD5/SHA1/SHA256) and verify files with the File Checksum Calculator.
Encoders/Decoders: Translate data with the Base64, URL, and HTML Encode/Decode tools.

📝 Code, Text & Dev Utilities
Code Playground: HTML, CSS, and JavaScript with live preview with code assist and syntax highlighting.
Code Minifiers: Reduce file sizes using the JavaScript Minifier and HTML Minifier, XML minifier.
Log Parser & Analyzer
File Comparison: Compare two files and highlight differences.
Regex Tester & Highlighter
Text Analysis: Analyze text using Text Statistics, manipulate it with the String Case Converter, and inspect hidden data using the Unicode Inspector and Invisible Character Viewer.

🛠️ Generators & Mock Data
Data Generators: Populate your apps using the Faker Generator, Random Data Generator, and UUID Generator.
AI Prompt Builder: Create optimized prompts for ChatGPT, Claude, Gemini, Cursor, and GitHub Copilot(Need improvements).
Scanners & Codes: Generate and read codes using the QR Code Generator, QR Code Scanner, and Barcode Generator.

🎨 Media, Files & Audio/Video

File Management: Image Compression & Resizer, Zip/Unzip Tool, Archive Maker(.tar, .gz, .tar.gz compression).
Images to PDF, Image to Base64, and generate documents with the PDF/DOCX Generator.
Media Utilities: Annotate screenshots + compress with the Screenshot Annotator, create animations with the GIF Animated Generator, and download files using the Google Drive Downloader. Create assets with the Icon Generator, Color Picker, and Gradient Generator.
Audio & Video: Record media natively using the Voice Recorder and Video Recorder, or translate audio using the Text to Speech and Speech to Text converters.

⏱️ Time & Scheduling
Timestamp ↔ Date Converter
Date & Time Difference Calculator:
Cron Expression Builder

Since I work on it only during weekends and holidays, progress is gradual, but the project continues to grow steadily with every release.

Feedback, suggestions, and contributions are always welcome.

Demo

https://freedevutils.github.io

The Comeback Story

I built all of the tools from scratch with significant assistance from AI-powered development tools. GitHub Copilot played the primary role in code generation, contributing roughly 80% of the codebase, while ChatGPT helped in prompt engineering, output validation and Google Gemini Pro helped with UI design ideas, enhancement, and code refinements for the advanced tools.
now github copilot helping me in making the project multilingual.

A small confession about this project. 😄
I built all 65+ utilities using free-tier AI tools.

GitHub Copilot Free.
ChatGPT Free.
Google Gemini Pro came bundled with my Jio SIM plan

So before GitHub Copilot decides to revoke my coding privileges after reading this... 😅
here is my argument- At least I'm not burning tokens teaching AI to build the thousands of clone of a falling-block game. I'm spending them building productivity tools that will be used by next generation of developers can use to solve real problems.

The current 65+ utilities are just the foundation. The next chapter is adding AI-powered capabilities and creating the developer tools of tomorrow and that too without using backend.

The reality is that AI can generate code, but it can't provide the vision, persistence, debugging, countless iterations, feature decisions, testing, documentation, and weekend hours required to turn ideas into a usable product.

The tools were free.
The time was not.

This project exists because of many weekends, holidays, and late-night sessions spent building something useful for the developer community. Progress is slow, but every release adds a little more value for the next developer who uses it.

My Experience with GitHub Copilot

GitHub Copilot has been an incredible development companion throughout this project. It helped transform ideas into working code faster, generated high-quality implementations, and assisted in overcoming countless technical challenges along the way.
What once took hours of boilerplate coding could be accomplished in minutes, allowing more time to focus on architecture, user experience, problem-solving, and refining features.it would have taken years to build those that I accomplished within month.

The real superpower is not AI itself—it's the combination of human imagination and AI assistance. When a developer can clearly envision something, tools like Copilot help carve that vision into reality.

https://freedevutils.github.io/release-notes/

Enjoy tools , progress and Prosper.

Built 70+ advanced, free, secure,privacy-first developer utilities with GitHub Copilot & Gemini Pro https://freedevutils.github.io

Pranay Mokal — Wed, 27 May 2026 13:27:52 +0000

Hey Dev Community 👋

I'm excited to share FreeDevUtils — a big collection of 70+ completely free, secure, privacy focused advance developer tools that run entirely in your browser.

Why I Built This

I got tired of:

Jumping between 10 different websites
Dealing with ads and trackers
Tools that require signups or send sensitive data to servers
Dealing Rate limit
Dealing with premiums

So I decided to create one single toolbox for developer community with all the utilities we use in daily life, it is my non profit venture to enhance developers productivity. Think it like I am build castle for developers.

✨ Key Highlights

🔥 Standout Tools

Restify — Full REST API testing tool
UML Class Diagram Builder,
Flowchart Designer,
Architecture Diagram Builder,
Log Parser & Analyzer — Analyse application logs with filtering
AI Prompt Builder
Docker Compose Visualizer
Advanced Subnet Calculator(IPv4 & IPv6)
HAR Analyzer
Swagger/OpenAPI Viewer - direct curl copy supported
Postman Collection Viewer -direct curl copy supported

Media & File Tools

Image Compression & Resizer (50-80% size reduction)
Images to PDF Conversion, GIF Animator, Icon Generator
QR Code Generator and QR Scanner, Barcode Generator
Voice & Video Recorder, Text to speech and speech to text generator
Advanced Zip/Unzip files client-side
Advanced Archive Maker for GZip, Tar files
Screenshot Annotator - with compression for AI image uploads

Data & Conversion Tools

JSON, YAML, XML, CSV converters & beautifiers
CSV ↔ JSON, CSV → SQL script generation
Base64, URL, HTML encode/decode
File Comparison tool
CSS to SCSS converter
SQL Beautifier & Minifier

Other Useful Tools

Code Playground (HTML/CSS/JS with live preview)
Regex Tester, Cron Expression Builder
JWT Decoder, SSL Certificate Checker
Faker & Random Data Generator
Password Generator + Strength Tester
Timestamp converters, Text Statistics, Unicode Inspector etc...
AES encrypt/decrypt and Advanced jasypt encrypt/decrypt

New Addition

OCR Studio - for Reducing AI token Consumption
PDF Studio - for PDF related utilities
NoteBook ++ - to access any text format files from web
Use Case Diagram Builder
Data pseudonymization studio - To secure real data while submitting to AI Providers.

You can now work seamlessly in your native language. Google Gemini helped in language translation so effectiveness of translation totally depends on google.

Supported Languages (43):
Afrikaans – Afrikaans, Amharic – አማርኛ, Arabic – العربية, Bengali – বাংলা,Chinese – 中文, Danish – Dansk,Dutch – Nederlands,English – English,
Finnish – Suomi,French – Français,German – Deutsch,Greek – Ελληνικά,Gujarati – ગુજરાતી,Hebrew – עברית,Hindi – हिन्दी, Hungarian – Magyar, Icelandic – Íslenska,
Indonesian – Bahasa Indonesia,Irish – Gaeilge,Italian – Italiano,Japanese – 日本語,Javanese – Basa Jawa,Kannada – ಕನ್ನಡ,Korean – 한국어,Kurdish – Kurdî,
Malay – Bahasa Melayu,Marathi – मराठी,Persian – فارسی,Polish – Polski,Portuguese – Português,Punjabi – ਪੰਜਾਬੀ,Romanian – Română,Russian – Русский,Serbian – Српски, Spanish – Español,Swahili – Kiswahili,Swedish – Svenska,Tamil – தமிழ்,Telugu – తెలుగు,Thai – ไทย,Turkish – Türkçe,Urdu – اردو,Vietnamese – Tiếng Việt

Try It Here it is developed to make developers life easy

https://freedevutils.github.io

All tools are client-side — nothing is uploaded to any server, your data remains secure at your machine. App Comes with Light and dark mode.

Tech Stack

Built with Angular and Angular material
Fully responsive
github pages
See Credits page for all opensource libraries used

What's Next?

Although GitHub's recent pricing changes have made it tough to build new tools using a free tier account, Google Gemini Pro is still helping me build tools. Please report any bugs on GitHub; I plan to keep adding more tools. I'm planning to keep adding more advanced tools...

So both Github Copilot and Google Gemini share 50%-50% percent contribution each as AI Assistant now.

Drop your feedback in the comments 👇

Try FreeDevUtils: https://freedevutils.github.io