Products & Tools I've Built
Live SaaS apps and AI tools I designed, built, and deployed end-to-end. Each one has its own terms — open it to see what applies. Need something custom? Let's talk.
Products & Tools
Everything below is live and maintained by me. Some need a sign-up, and pricing varies by tool.
GameHub 3D
Browser-native 3D games that start in one click — drift a canyon, stack a tower, race a ghost. No download, no signup, no launcher.
Bulk QR Code Generator
Paste a list of URLs or import a CSV and instantly generate QR codes in bulk — customize colors, add a logo, and download all as a ZIP.
MD to PDF
Convert Markdown to a professional PDF document with formatting and styling options.
AirCare India — Live AQI Checker
Check real-time air quality index for 800+ Indian cities — get PM2.5 breakdowns, 24h trend charts, and AI-powered health tips based on your planned activity.
SEO Groww — Free SEO & AI Search Tools
A single workspace for SEO and AI-search visibility — check whether ChatGPT, Claude and Perplexity can cite your pages, crawl your whole site, audit 100 URLs at once, and generate meta tags, schema and sitemaps.
CheckPre — Free Online Calculators
Free calculators across categories — EMI, SIP and tax, health, home and construction, solar ROI, LLM API costs and more. No sign-up, and every result shows its working.
Frequently Asked Questions
What to expect before you open a tool.
Are these tools free?
It depends on the tool. Some are free to use, some are ad-supported, and others run on a subscription or credit-based plan. Each tool states its own terms — open it to see what applies.
Do I need an account to use them?
Some tools work straight away with no sign-up. Others need an account so your data, history, or credits can be saved to you. The tool will tell you before you start.
Who builds and maintains these?
I do — Niraj Kumar. Each one is designed, built, deployed, and maintained by me end-to-end. They are live products, not demos or screenshots.
Something is broken — can I report it?
Yes, please do. Send me a note through the contact page with the tool name and what happened, and I'll look into it.
Can you build something like this for me?
Yes. If you need a SaaS product, AI tool, or automation built from scratch, or a variation of one of these, go to the contact page and tell me what you have in mind.
Need a Custom Product?
Have an idea for a SaaS, AI tool, or automation system? I'll design and build it from scratch to fit your exact requirements.