Tools
A small collection of practical utility apps for work, study, and everyday use.
cardcounter.pairusuo.top
Card Counter
A lightweight browser card counter for quick blackjack practice and table-side drills.
clock.pairusuo.top
Desktop Clock
A clean fullscreen clock page for work setups, study sessions, and secondary displays.
roi-calculator.pairusuo.top
Keyword ROI Calculator
A simple ROI calculator for evaluating keyword traffic value before you spend on SEO or ads.
data-table.pairusuo.top
Data-table
An online data table tool for quickly organizing, viewing, and working with structured data.
asset-correlation-monitor.pairusuo.top
Asset Correlation Monitor
Track asset correlations to see how markets move together and spot changing relationships over time.
offline-service.pairusuo.top
Offline Service
Check whether a website or service is reachable and quickly confirm possible downtime.
More tools on the way
More practical calculators and small utilities will be added over time.