I keep needing the same small jobs done on my laptop. Percentage of a number. Days between two dates. Pretty-print some JSON. Turn a markdown file into a PDF without opening three different apps.
The math is easy. Finding a page that just does the job without an email gate, autoplay, or half the viewport covered in ads for stuff i dont want is what wore me down.
So i built tools.rus.io.
Handful of utilities in the browser. No account. No paywall. Use it, close the tab.
Right now you have:
- US Supplement Facts panel generator — supplement facts panel from a simple markdown-style description, live preview, PNG or SVG out.
- Markdown to PDF — paste or load a
.mdfile, preview styled, grab a PDF.
Calculators i got sick of re-googling:
- Percentage calculator
- Age calculator
- Discount calculator
- Tip calculator
- Date calculator — between dates, add or subtract days, business days.
- Bill split calculator
- ROI calculator
And for when someone pastes ugly JSON into Slack:
- JSON formatter and validator — prettify, minify, validate, tree view.
Password generator is coming; not live yet.
I’ve spent years building and running software for real businesses. Big distributed platforms, SaaS, selling physical products on Amazon. A lot of it is the same boring theme: stop answering the same question by hand, check the same format twice instead of twenty times, turn a chunk of data into something you can actually send someone. tools.rus.io is where i put the small-stuff version of that habit.
If one of these saves you ten minutes once, fine by me. If not, also fine.