As developers (and honestly, as normal internet users), we constantly need small utilities:
Calculate income or working hours
Convert Markdown to HTML
Generate a UUID
Quickly estimate habits, screen time, or productivity
None of these are “big problems,” but they interrupt focus again and again.
Most of the time, I found myself:
Googling the same tools repeatedly
Opening websites full of ads and pop-ups
Jumping between 5–6 different sites
So I decided to solve a very simple problem:
What if all these small, useful tools lived in one clean, free place?
That’s how HNGTools started.
The Real Problem with Online Tools
If you think about it, the issue is not lack of tools.
The issue is fragmentation and friction.
Common problems I kept facing:
One tool per website
Overcomplicated UIs
Forced signups
Too many ads
Mobile-unfriendly pages
When you just want to calculate something quickly, all of this feels unnecessary.
The Idea Behind HNGTools
HNGTools is a collection of simple, free online tools that focus on one thing:
Solve the task fast. No signup. No distractions.
You can explore everything here:
https://www.hngtools.com
The tools are grouped into three main categories.
1) Online Calculators (Daily + Professional Use)
These are calculators I personally needed again and again.
Some examples:
Time Card Calculator—for freelancers and hourly work
https://www.hngtools.com/time-card-calculator
Annual Income/Salary Calculator—convert hourly or monthly income into yearly numbers
https://www.hngtools.com/annual-income-salary-calculator
Habit Cost Calculator—see how much habits actually cost over time
https://www.hngtools.com/habit-cost-calculator
Screen Time Lifetime Calculator—a reality check for phone usage
https://www.hngtools.com/screen-time-lifetime-calculator
Full calculators list:
https://www.hngtools.com/online-calculators
2) Converters for Developers & Everyday Tasks
Converters are things developers Google daily.
Some useful ones:
Markdown to HTML Converter
https://www.hngtools.com/markdown-to-html-converter
Hex to RGB Color Converter
https://www.hngtools.com/hex-to-rgb-color-converter
Pixels to Aspect Ratio Calculator
https://www.hngtools.com/pixels-to-aspect-ratio-calculator
All converters:
https://www.hngtools.com/online-converters
3) Generators (Quick, No Thinking Required)
Generators are for moments when you just want a result instantly:
UUID Generator
https://www.hngtools.com/uuid-generator
Instagram Font Generator
https://www.hngtools.com/instagram-font-generator
Random Choice Generator
https://www.hngtools.com/random-choice-generator
All generators here:
https://www.hngtools.com/online-generators
Why I’m Sharing This on DEV
I’m sharing this here because DEV is one of the few communities where:
People value useful tools
Honest side projects are welcomed
Feedback actually helps shape products
This is still growing, and I’m actively improving it.
What’s Next?
Some things I plan to add or improve:
More developer-focused utilities
Better mobile experience
Performance optimizations
Tools suggested by users
If you have:
A tool you constantly Google
A calculator you wish existed
Feedback on UX or features
I’d genuinely love to hear it.
Transparency
Just to be clear:
Yes, I built HNGTools.
I’m sharing it here because I use it myself and thought others might find it useful too.
Thanks for reading.
If this helped you even a little, that already makes it worth building.
Happy coding!
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