Four tools for people who run leagues.
Everything reads straight from the Sleeper API with just a username — no password, no browser extension, no "connect your account" ceremony. Browse the shelf, pick your poison.
Start here
Bring your league
Scoring Calculator
Scoring what-if analysis
Change any scoring rule in your Sleeper league and instantly re-score the real season
Lineup Auditor
League Command · start/sit accountability
Audit every lineup in your Sleeper league
Manager Intel
Vet a manager before the invite
Run a background check on any Sleeper username: career record, championships, week-by-week lineup reliability, and transaction habits from the last three seasons of their Sleeper leagues.
Lineup Lottery
Coffee-break dynasty game
Draw random NFL teams blind, draft a roster, and get graded on expected titles across 2026–28. No login, one leaderboard, zero mercy.
In the shop
Built, being torture-testedPeek — Vet a league before you join — scoring, roster build, and current rosters at a glance.
Little Birds — Scout your leaguemates — cross-league records, FAAB tendencies, tells.
Trade Calculator — Two-sided trade grading with consensus values and the Stud Tax.
Draft Assistant — Dynasty and rookie boards from FantasyCalc + KTC consensus.
Playoff Machine — Clinch scenarios, elimination math, magic numbers.
Player Rankings — Build a board you actually believe in, KTC-style.
Bring your league. Keep your Sundays.
Free · Read-only Sleeper API · No password