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Humayun Nasir
Humayun Nasir

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The Free Online Tools I Actually Use as a Developer (and Why I Built HNGTools)

Developers don’t hate tools.
We hate bad tools.

You know the kind:

Calculators buried under ads

Simple utilities locked behind sign-ups

“AI-powered” tools that don’t explain anything

Converters that break on edge cases

After years of jumping between random websites for small tasks, I noticed a pattern:

We keep reinventing the wheel for problems that should take 10 seconds to solve.

That’s what led to HNGTools—a collection of free, focused online tools built to solve real, everyday problems without noise.

This post isn’t a sales pitch.
It’s a practical breakdown of the kinds of tools developers, students, and professionals actually use—and why simplicity still wins.

Why Developers Still Rely on Small Online Tools

Even with powerful IDEs, CLIs, and scripts, we still Google things like

“UUID generator”

“APY vs APR”

“HEX to RGB”

“How many hours did I work this week?”

“How much is this habit costing me yearly?”

These aren’t complex problems—they’re frequent problems.

Good tools:

Reduce cognitive load

Save time during context switching

Help with decisions, not just math

Don’t demand attention or data

That philosophy drives everything on HNGTools.

What Is HNGTools?

HNGTools is a free online tools platform focused on:

Calculators

Converters

Generators

Productivity utilities

All tools are:

Free to use

No sign-up required

Fast and mobile-friendly

Built around one clear purpose

Backed by explanatory content

👉 Homepage: https://www.hngtools.com

  1. Calculators That Go Beyond “Just Math”

Most calculators online give you a number and disappear.
Better ones explain why the number matters.

Financial & Cost Awareness Tools

Some of the most-used tools on HNGTools deal with money—because small leaks add up.

Examples:

Habit Cost Calculator—shows how daily habits quietly cost thousands

Subscription Expense Calculator—reveals recurring expenses people forget

APY vs APR tools—clarify confusing financial terms

These aren’t finance bro tools.
They’re clarity tools.

🔗 Calculators: https://www.hngtools.com/online-calculators

Work, Career & Study Calculators

As developers (or students), we constantly estimate effort and outcomes.

Useful examples:

Annual Income Calculator – converts hourly/monthly pay into real yearly numbers

Time Card Calculator—quick work-hour tracking

Final Exam Calculator—tells students exactly what score they need

Snow Day Calculator—surprisingly popular for planning

Each tool answers one question cleanly—no dashboards, no fluff.

Health & Productivity Calculators

Not everything we calculate is about money.

Examples:

Sleep Debt Calculator—explains why you’re always tired

Screen Time Lifetime Calculator – visualizes long-term habits

Skill Learning Time Estimator – sets realistic learning expectations

Calorie Deficit Calculator—cuts through fitness myths

These tools help turn vague concerns into actionable insight.

  1. Converters Developers Bookmark (and Reuse)

Converters are most useful when you’re already stressed.

HNGTools focuses on the ones developers and creators use repeatedly:

HEX to RGB Color Converter

Markdown to HTML Converter

Pixels to Aspect Ratio Calculator

Mouse Sensitivity Converter (for gamers)

Morse Code Converter

Shoe Size Converter

What matters here:

Clean input/output

Accurate conversion logic

No popups or forced redirects

🔗 Converters: https://www.hngtools.com/online-converters

  1. Generators That Reduce Decision Fatigue

Generators aren’t toys when built correctly—they’re accelerators.

Common examples:

UUID Generator—essential for dev and testing

Name Generators—useful for games, writing, and mock data

Random Choice Generator—solves “just pick one” moments

Minecraft Circle Generator—precise builds without trial and error

Random Pokémon & Country Generators—fun, educational, and creative

The goal isn’t randomness—it’s speed + inspiration.

🔗 Generators: https://www.hngtools.com/online-generators

Transparency, Trust & EEAT (Why It Matters for Tools)

A tools website should be boring in one important way: trust.

HNGTools makes this explicit with

A clear About Us page

An open Contact page

Transparent Privacy Policy

Honest Disclaimer

Clear Terms of Service

Relevant pages:

About: https://www.hngtools.com/about-us

Privacy: https://www.hngtools.com/privacy-policy

Disclaimer: https://www.hngtools.com/disclaimer

This matters not just for Google EEAT but also for users who don’t want dark patterns.

Why Free Tools Still Beat Paid Apps

Paid apps promise:

Dashboards

AI insights

Automation

Free tools win by doing something simpler:

They respect your time.

No accounts.
No tracking.
No lock-in.

Just input → output → done.

That’s why many developers still rely on focused utilities instead of bloated platforms.

Final Thoughts

Good tools don’t try to impress you.
They quietly disappear after doing their job.

Whether you’re:

A developer context-switching all day

A student planning exams

A professional tracking income

A creator looking for quick utilities

The right tools remove friction from everyday decisions.

If you value clarity, accuracy, and transparency, HNGTools is worth bookmarking.

🔗 Explore all tools: https://www.hngtools.com

🔗 Blogs & explanations: https://www.hngtools.com/blogs

🔗 Productivity tools: https://www.hngtools.com/productivity-tools

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