Using the machine learning capabilities of AWS, the PFF Improvement Index quantifies how much value NFL teams are adding or losing during NFL free agency. This page will track the movement according to each day’s transactions, with notes on each team’s affected position groups.

Amid the big-name players changing uniforms, some fantastic deals are being overlooked. And on the flip side, some misconceived signings might have been given too much praise. Using our PFF database, let's dive into the most underrated and overrated free agent signings made this past week.

To keep you up to date with all the news, updates and developments from the 2020 NFL free agency period, PFF highlights some key takeaways from Friday, March 20.

Chris Harris Jr. was one of the best NFL free agents available and ended up choosing the Los Angeles Chargers as his destination for 2020 and beyond, giving the team quite the group of defensive backs.

Darius Slay’s PFF grade fell last season, but a deeper look at the defensive back's body of work suggests that he will thrive in the Philadelphia Eagles’ coverage mix.

By adding Jack Conklin and Austin Hooper in NFL free agency, the Cleveland Browns are working to eliminate any obstacles to Baker Mayfield’s success.

The Las Vegas Raiders filled a massive need in NFL free agency, inking linebacker Cory Littleton to help fortify a poor pass-coverage unit.

Aside from the Arizona Cardinals fleecing the Houston Texans for DeAndre Hopkins, a handful of teams have made significant improvements early in free agency — and some have done the opposite.

The Philadelphia Eagles’ latest addition via NFL free agency, Javon Hargrave, is a disruptor who is going to shine on a defensive line already chock full of NFL talent.

Long-time New England Patriots quarterback Tom Brady has officially signed with the Tampa Bay Buccaneers, which instantly turns the Bucs into Super Bowl contenders.

By retaining safety Anthony Harris in NFL free agency, the Minnesota Vikings have ensured themselves of having arguably the best safety tandem in the league.

Philip Rivers was admittedly far from a perfect player with the Los Angeles Chargers in 2019, but the Colts put him in a position to succeed.

Matt Rhule and Joe Brady can build an offense around Teddy Bridgewater’s strengths, but the Carolina Panthers also have the draft capital to go after his replacement in the NFL Draft.

The "greatest of all time" tag gets thrown around quite a bit these days, but it’s truly fitting for Tom Brady and what he’s accomplished at the quarterback position for the New England Patriots.

The New Orleans Saints have re-signed quarterback Drew Brees to a two-year deal, so it’s worth taking a look at just what kind of player Brees is right now and how likely another Super Bowl run is.

Bruce Arians needs a quarterback who plays to his system’s strengths. Tom Brady needs playmakers to unleash his full potential one last time.

The Carolina Panthers' signing of Teddy Bridgewater in NFL free agency is good news for D.J. Moore but will hurt Curtis Samuel's fantasy football prospects.

Bill Belichick and the New England Patriots have several options for replacing Tom Brady through NFL free agency and potential trades.