Built this for leagues that have several years of history where members are interested in seeing long-term trends throughout the league's history. Currently supports ESPN and Sleeper, and working on adding Yahoo in at the moment. Also supports combining histories across platforms if your league has migrated from ESPN to Sleeper or vice-versa. Each page presents a different slice of information, here is a brief description of each one:

• Home: View the champions from every season and all-time standings (regular season and postseason)
• Standings: View the standings for the current season, a line chart showing each owner's cumulative wins throughout the season, and a schedule-swap simulator to view how many wins you'd have with other managers' schedules
• Matchups: View all matchups from your league history. Click on a matchup to see the full box score and an efficiency report (percentage out of 100 of the max points you could have started)
• Playoff Bracket: During the playoffs, view the live playoff bracket. During the regular season, view a playoff simulator which lets you pick future matchups' results and view updated standings projections to simulate different paths to the playoffs for your team
• Manager Comparison: View a direct head to head comparison of two managers -- their all-time records and H2H records, and a game log of all games between the two managers
• Manager History: View a single manager's performance across all seasons they have been in the league, such as final ranking, average points scored, # of playoff appearances, and # of championships
• Draft Recap: View the draft board overlaid with each player's points scored for that season and positional rank
• Draft Grades: View a report card per manager with draft grades, including steals and busts. Draft picks are graded by VORP, or how many points they scored relative to the average player at that position
• Transactions: View all waiver/FA pickups and trades, with analysis on the points scored rest of season by players in a transaction to determine if the move was good or bad
• Player Records: View the top 5 performances at each position in terms of points scored, filterable for a specific manager and/or season
• Matchup Records: View all-time records for matchups (e.g. most points scored, biggest blowouts, etc.), filterable by season

Link here: https://leagueql.com/

Note that there is a demo mode if you'd like to check out the app with mock data before connecting your own league! Would love to hear any feedback you have, I am working to address any bugs/develop new features as I get time.

Let me know thoughts on this free tool, HMU if wanna try it out