About

Stack & Flex is a free NFL daily fantasy site. The first tool is a lineup optimizer that never needs an account.

You export a salary CSV from DraftKings or FanDuel, optionally replace the projections, and build lineups on your own device. We do not scrape those sites, ESPN, or anyone else.

Contest rules are configuration: caps, roster slots, team and game limits, and the captain multipliers. The integer solver is HiGHS, compiled to WebAssembly, so a build does not depend on a server's CPU limit.

Player, team, and news pages are a content model with a few real articles. They are not a live stats product yet.