← Work

thatone.app

120 calculators, trackers and games that run in the browser

Client
Apps & tools
What we did
Website, App, Logo, Branding, SEO, Hosting
Live
August 2025
Redesigned
October 2026

Visit thatone.app (opens in a new tab)

  • 120free browser tools
  • 37calculators
  • 11categories
  • Data stays on device: no accounts, ads
  • Works offline via a service worker
  • QR generator with opt-in scan tracking
  • Trackers, calculators, generators, games in one place
  • Framework-free static build with automated quality checks
  • thatone.app: Home and tool search
    Home and tool search
  • thatone.app: Mortgage calculator with breakdown
    Mortgage calculator with breakdown
  • thatone.app: Pomodoro timer, dark mode, on a phone
    Pomodoro timer, dark mode, on a phone
  • thatone.app: Logo maker on light and dark
    Logo maker on light and dark
  • thatone.app: Habit tracker with streaks
    Habit tracker with streaks
  • thatone.app: Yacht Dice game on a phone
    Yacht Dice game on a phone
  • thatone.app: Soroban abacus showing 2,026
    Soroban abacus showing 2,026
  • thatone.app: Compound interest growth chart
    Compound interest growth chart