Practical Tools for Better Answers.
DD42 builds small, focused web tools that make everyday decisions easier. Small, focused, and free of noise, with useful answers you can share.
Tools
2 LIVESPORTS · FREELIVE
All-Time Basketball Lineup
Build your all-time basketball team: 10 players, two per position. Find out if it would actually work as a team, scored deterministically and explained like a GM.
Build your team →
CREATORS · FREELIVE
Membership Platform Finder
Tell us what you're building and get one recommended membership platform, what it will actually cost at your numbers, and what you give up. 22 platforms researched from their own pricing pages.
Find your platform →
How DD42 Tools Work
Every tool follows the same rule: the code calculates the result, and any explanation is grounded in that result. Same inputs, same answer, every time.
01
Deterministic First
Scores and rankings come from versioned, testable logic, never improvised.
02
One Job, Done Well
Each tool answers one question with clear inputs and a defensible result. No dashboards to learn.
03
Made to Share
Every result has a clean page you can send to anyone.