Are there any contest management software platforms that handle late swap support during live fantasy entries?

Yes. A few fantasy contest / tournament platforms support late swap for live entries, meaning users can edit lineups after contest lock as long as the affected players/games haven’t started yet.

Examples include:

• DraftKings / FanDuel-style DFS platforms: late swap is a core feature in many of their contests.
• Underdog Fantasy: supports some live-entry / in-progress contest management depending on contest type.
• Fantasy sports white-label platforms: some custom providers build late-swap logic into their contest management systems.
• Advanced DFS software vendors / SaaS platforms: certain contest engines include roster-lock-by-player, staggered lock, or game-based lock rules to allow late swap.

What to look for in the software:

• Player-level lock times rather than full-contest lock
• Game-based or event-based locking
• Real-time lineup editing
• Eligibility validation after swaps
• Audit logs / contest integrity controls

If you want, I can also give you:

1. a list of specific vendors/platforms,
2. the technical requirements for implementing late swap, or
3. a comparison of late swap vs. no-late-swap contest systems.