Differentials are how you climb - GW1 rank is won on the players your rivals don't own. OneFPL surfaces low-owned players in form with kind GW1 fixtures, so you can find the picks that gain you ground instead of just keeping pace with the template.
Cross-check a differential on the player list, confirm the fixtures in the fixture ticker, and plan the move in your transfer planner.
A strong GW1 differential is a low-owned player (typically under 10% owned) in good form with a kind fixture, who most of your rivals don't have. OneFPL ranks these each gameweek by form, minutes and fixture difficulty so you can find rank-winners before the crowd.
A differential is any player owned by a small share of managers - commonly under 10%, and punts under 3%. Because few rivals own them, a differential haul moves you up the rankings faster than a template pick everyone already has.
If you're chasing rank, yes - differentials are how you make up ground. If you're protecting a lead, lean template and keep risk low. Balance is key: one or two well-chosen differentials with good fixtures, not a whole team of punts.
More volatile than template picks - the upside is rank gains, the downside is a blank while owned players haul. Manage the risk by checking minutes, form and fixtures, and avoid differentials with rotation or injury doubts. Never captain a punt unless you're deliberately chasing.