Short answer: for live redraft trade negotiation use FantasyPros. For dynasty trades use KeepTradeCut or FantasyCalc. For grading the trades your league has already made — the ones that actually shaped your standings — use The Sunday Chronicle's Trade Tape, which evaluates every historical trade against what actually happened next.
The three categories of trade analyzer
Live redraft analyzers. Take two sides of a proposed trade, weigh against current-season rest-of-season projections, return a fair-value verdict. Best for in-season negotiation.
Dynasty value calculators. Use crowd-sourced rankings that account for age, long-term value, and pick capital. Updated weekly or daily based on trades happening across thousands of leagues.
Post-trade graders.Look backward at trades that actually happened and score them against the players' subsequent production. The trade record of a league told as a story, not a prediction.
FantasyPros Trade Analyzer
The standard for redraft. Uses expert consensus rankings to grade live trade proposals. Free tier covers basic grading; MVP tier unlocks rest-of-season-specific weighting. Works well in standard PPR / half-PPR leagues. Less precise for unusual scoring formats.
KeepTradeCut
The dominant dynasty trade analyzer. Crowd-sourced — users compare three players head-to-head, KTC aggregates the votes into a value ranking. Updates daily. Free to use. The standard reference point for dynasty trade fairness.
FantasyCalc
Similar to KeepTradeCut but uses actual completed trade data from Sleeper as its source rather than vote pairs. Updates frequently as real trades flow in. Free; popular for dynasty and superflex.
The Sunday Chronicle Trade Tape
Different category: post-trade grading at the league level. The Sunday Chronicleimports every trade from your league's full history — Sleeper, ESPN, NFL.com, Yahoo — and grades each one against the players' actual production after the trade. The result is a chapter in your league's almanac that tells the story of every deal: who won, who lost, what could have been. Best for: leagues that want a permanent trade history with verdicts, not pre-trade negotiation. Included in the free tier alongside the rest of the almanac.
Which to use when
— Negotiating a redraft trade right now: FantasyPros
— Negotiating a dynasty trade right now: KeepTradeCut or FantasyCalc
— Settling whether a past trade was lopsided: The Sunday Chronicle Trade Tape
— Recording the league's trade history as part of an archive: The Sunday Chronicle
Common mistakes
Using a redraft tool for dynasty (or vice versa). Different valuation models — the grades will mislead.
Trusting the grade over league context.A "losing" trade by points may be correct for the team's roster construction.
Skipping the historical record.Knowing which past trades actually moved the league's competitive balance teaches more than any single live grade.
Start with the league's actual trade history
Before evaluating any new trade, knowing which historical trades shaped your league is the highest-signal context. The Sunday Chronicle gives you that automatically for any Sleeper, ESPN, NFL.com, or Yahoo league. Tour the demo to see the Trade Tape inside a finished almanac.