Are the tools on WebToolkit Pro free to use?

Yes, all 150+ developer tools on WebToolkit Pro are 100% free with no sign-ups or paywalls required.

How does the Severance Calculator work?

The Severance Calculator uses official 2026 labor law formulas to compute end-of-service benefits and gratuity payouts across 30+ countries.

Where is Abu Sufyan based?

Abu Sufyan is a solo indie maker and tool builder based in Lahore, Pakistan.

Abu Sufyan | Solo Maker & Tool Builder

What do I build?

11 items

WebToolkit Pro ↗

I got tired of pasting sensitive JSON payloads into random ad-filled sites just to format them. So I built a client-side only toolkit. No servers, no data logging. It started with 12 utilities and has organically grown to 150+ tools used by developers and writers daily.

Severance Calculator ↗

I couldn't find a clean severance calculator for Pakistan that didn't require an email sign-up. I built one in a weekend. Then HR managers started asking for UAE, then the UK, then the US. It now covers 30+ countries with official 2026 labor law formulas and gets used globally every single day.

TradeConvert ↗

Construction workers and engineers spend hours looking at unreadable PDF conversion tables on job sites. TradeConvert turns NIST-verified technical reference data into a clean, mobile-first interface they can actually tap with gloves on.

SLA Breach Calculator ↗

Computing financial penalties and service credits for B2B IT contracts is a nightmare of spreadsheet formulas. I built this to instantly calculate uptime shortfalls for procurement teams and IT managers so they don't have to hire expensive consultants.

CrawlScope ↗

As AI started scraping the web, I needed a way to audit how GPTBot and Anthropic actually read my sites. CrawlScope is a dashboard that simulates AI crawlers and checks your robots.txt defenses. Built primarily for technical SEOs.

Niche Storefront Dashboard ↗

A high-density administrative backend for specialized e-commerce. Built on the bleeding edge using TanStack Start (React 19) and PostgreSQL, it handles dynamic inventory, complex zod validations, and interactive sales analytics through a clean, enterprise-grade Radix UI architecture.

Query Purf ↗

A high-performance data querying dashboard built with Next.js App Router. I designed it specifically for deep system analytics and technical readability. It streams complex datasets from Server Components straight to heavily optimized Client Component data tables and charts.

Studio Context Catalog ↗

Managing state drift and distributing context boundaries across teams is complex. I engineered this internal technical engine to solve ContextOps securely. Built on Next.js 15 with multi-tenant Supabase Auth/RLS and custom API routing, it demonstrates how to handle strict data boundaries and complex architectural workflows at scale.

StudyNova ↗

A comprehensive learning platform for students featuring GPA calculators, exam countdowns, and printable planners. Built to replace cluttered ad-filled student portals with clean, instant utilities.

Quran Tracker ↗

A privacy-first Islamic reading tracker. Built for readers to log their progress and earn badges without their reading habits being tracked or stored on external servers.

Freelance Tax Calculator ↗

An enterprise-grade financial suite for independent professionals. Calculates exact take-home pay by modeling 1099 taxes, platform fees, and complex US self-employment tax rules.

What is the impact?

Social proof

Illustrative Use Cases:

"An HR manager in Qatar used the Severance Calculator at 2am to figure out a payout. That's the product."

"TradeConvert is actively bookmarked on iPads at construction sites because the official reference PDFs are unreadable on mobile."

"A developer formatted a sensitive JWT token on WebToolkit Pro because it strictly runs client-side. Zero trust architecture matters."

"Over 150 tools built without a single marketing dollar spent. Just spotting gaps and out-executing the SEO competition."

Who is the maker?

The maker

"Why doesn't a clean, free version of this exist?" — that's where every tool starts.

Abu Sufyan

Solo Indie Maker & Engineer

I'm a solo maker from Pakistan. I build free professional tools for people who need quick, reliable answers:

HR managers: Calculating severance across 30+ countries.
Developers: Formatting JSON securely with client-side execution.
Writers & SEOs: Optimizing content and tracking core web vitals.

No VC funding. No team. Just spotting real gaps, building clean solutions fast, and putting them online for free. The tools pay for themselves through advertising — so users never pay a cent.

Every tool is built to last — real data sources, updated laws, and a design that doesn't get in the way of the answer.

Explore All Tools →

On accessibilityProfessional tools should be free. The person who needs a gratuity calculation most is usually the one who can't afford a lawyer.

On designA tool should give you the answer in under 30 seconds. No tutorial, no sign-up, no loading screen.

On buildingFind something millions of people Google every month where every result is a PDF or a forum post. Build the clean tool. Rank. Repeat.

Build Log

JAN 2024

wtkpro.site — launched

Launched with 12 tools. Now at 150+. Zero marketing budget.

FEB 2026

tradeconvert.pro — launched

Built because finding reliable density formulas on mobile was impossible.

MAY 2026

severancecalculator.xyz — launched

Built for Pakistan first. Expanded to 30+ countries after global HR requests.

JUN 2026

slabreachcalculator.site — launched

Saving IT managers from writing complex Excel formulas for downtime.

JUN 2026

CrawlScope — launched

Needed a way to see how GPTBot was reading my own portfolio.

Q3 2026

Working Capital Calculator

Building this because CFOs asked for it after using the Severance tool.

Q4 2026

Freight Class Calculator

Democratizing freight class data hidden behind carrier portals.

OCT 2026

Studio Context Catalog — launched

Local dev tool for managing Context Commits for LLM prompts.

NOV 2026

Query Purf — launched

High-performance data querying and visualization dashboard.

DEC 2026

Niche Storefront — launched

Enterprise-grade e-commerce dashboard built on TanStack Start.

Writing Selected articles

01

How to Decode a JWT Token Without a Library

wtkpro.site/blog

A practical deep-dive into JWT structure, base64url decoding, and building a zero-dependency decoder in any browser.

JWTSecurityJavaScript

↗

02

What Is JSON? The Complete Guide

wtkpro.site/blog

Everything a developer or analyst needs to know about JSON — structure, data types, validation, and real-world use cases.

JSONAPIReference

↗

03

How to Block AI Crawlers With robots.txt in 2026

wtkpro.site/blog

A 2026 guide to protecting your content from GPTBot, ClaudeBot, Anthropic, and other AI crawlers using robots.txt directives.

SEOAICrawlers

↗

View all 50+ articles on WTK Pro Blog ↗

Experience & Skills CV / Resume

"From freelance to building a 150+ tool ecosystem."

I specialize in Next.js, technical SEO, and building fast, privacy-first web tools. Currently, I am the Lead Engineer at Netizen Labs and the solo founder of WebToolkit Pro.

Core Technologies

Next.js 14 React TypeScript Node.js Technical SEO Core Web Vitals Tailwind CSS Serverless JSON-LD

View & Download CV ↗

Recent Roles

2024 — NOW

Founder & Lead Engineer

WebToolkit Pro · 150+ Tools

2024 — NOW

Lead Engineer

Netizen Labs · SEO & Web Apps

2023 — NOW

Freelance Full-Stack Developer

Upwork · Clients in US, UK, UAE

2024 — 2026

Computer Science Degree

Lahore Leads University

Client Feedback Upwork

★★★★★

"Abu Sufyan delivered exceptional quality on our Next.js migration. He didn't just write code; he optimized our entire SEO architecture. Highly recommended."

— Technical Founder, USA via Upwork

★★★★★

"Super fast and reliable. Fixed our Core Web Vitals from failing to 95+ in 2 days. Will definitely hire again for future performance optimization tasks."

— E-commerce Client, UK via Upwork

Contact Get in touch

"Have a tool idea, a partnership, or just want to talk shop?"

I'm always open to conversations about interesting tool ideas, niche problems worth solving, or SEO-driven product strategy. I am available for freelance projects on Upwork, and I'm also open to collaboration, licensing discussions, or strategic partnerships around the tool ecosystem I'm building.

The best way to reach me is via GitHub or by submitting a tool suggestion on WebToolkit Pro. I read everything.

Hire Me on Upwork ↗ GitHub ↗ Submit Tool Idea ↗

Open toFreelance web development, technical SEO audits, and custom tool building.

Current AvailabilityI am actively taking on select freelance projects exclusively through Upwork.

Response timeI read all inquiries within 24 hours. Upwork invites get the fastest response.

The person who needs a tool most usually can't afford a lawyer.

What do I build?

What is the impact?

Who is the maker?