KL KeeperLens

Static build · $0 · no accounts · no backend

Fantasy values from your league,
not a generic rankings list.

KeeperLens reads your Sleeper league's actual scoring data and turns it into trade values, keeper rankings, and a weekly start/sit digest — tuned to your scoring, your rosters, your matchups.

Try the live demo How the math works

Trade analyzer

Two-sided deal grading from league-specific player values. No more "who won the trade?" arguments.

Keeper rankings

Every rostered player scored for keeper value with an age curve — built for dynasty and keeper formats.

Weekly digest

Projected-optimal lineup vs. your set starters, with one-line reasons for every suggested swap.

Load a league

Paste any public Sleeper league ID, or load the demo league. Imports load directly from Sleeper's public API in your browser.

Not loaded yet.

Roster values & keeper ranks

Trade value blends recent form, season average, trend, and positional scarcity. Keeper value applies an age curve on top — see How it works.

PlayerPosNFLExpLast 3 SeasonTrendTrade valKeeper rk
Load a league to see values.

How it works

Everything is computed from your league's real scoring data via Sleeper's free public API — no expert rankings, no black box. The exact recipe:

  1. Per-player weekly scores are pulled from every completed matchup (players_points), so a player's numbers already reflect your league's scoring.
  2. Recent form = last 3 weeks weighted 50/30/20, blended 65/35 with the season average. Trend = recent vs. season, capped at ±25%.
  3. Positional scarcity (VORP): replacement level is the (starters × teams)-th best player at each position; FLEX adds 40% of a starter share to RB/WR/TE. Points above replacement get a 50% bonus.
  4. Trade value = round(raw × 10 + 5 × points above replacement).
  5. Keeper value = trade value × age curve (rookie 1.20, 2nd-yr 1.12, 3rd-yr 1.06, yrs 4–6 1.00, yrs 7–9 0.94, 10+ 0.85).
  6. Weekly projection = recent form × matchup factor, where the factor is (league-average points allowed ÷ this opponent's points allowed), clamped 0.80–1.25.
  7. Start/sit leans compare the projected-optimal lineup against the lineup currently set, flagging any swap worth more than 1.0 projected point, with the reason attached.

Roadmap — stubbed in this MVP

These are intentionally not built yet. Each is marked so there's no confusion about what this demo does and doesn't do.