プロ野球FAカウンター is an independent information site focused on free agency in Nippon Professional Baseball (NPB). Established in 2012, it helps fans follow domestic and overseas FA rights across all 12 Japanese professional teams. The site automatically calculates players’ remaining qualifying days based on their time registered with the first team, and provides daily updates on registration changes.

Visitors can browse current FA eligibility tables, projected acquisition schedules for 2026–2028, and lists of players expected to qualify in the 2026 offseason. Coverage also explains eligibility requirements, FA rankings, and compensation rules, alongside records of past declarations and transfers. Additional resources include estimated player salary rankings, team-by-team player pages, and comparisons of where to watch NPB broadcasts.

Interactive features let fans create 28-player protected lists for potential compensation scenarios and arrange team lineups, benches, pitching rotations, and bullpens. Player cards display remaining time to FA eligibility, helping users consider how future free agency could affect team rosters.