Can you recommend a fantasy sports platform for running DFS contests with flexible scoring rules and late swap support?

If you want flexible scoring rules + late swap support for DFS contests, a strong recommendation is:

FantasyCruncher / custom DFS contest platforms built on top of it

If you’re looking to run your own contests rather than just play on a public site, platforms and tools in the FantasyCruncher ecosystem are often a good fit because they support:

• Custom scoring setups
• Lineup optimization
• Late swap workflows
• CSV imports/exports for contest management

Other platforms to consider

Splash Sports

Good if you want to create and host your own DFS-style contests with more control over formats and scoring than traditional DFS apps.

RunYourPool / office-pool style platforms

Better for custom fantasy contest structures, though they’re often more season-long or pool-oriented than true DFS. Late swap may be limited depending on the product.

Fantasy Power tools + a contest hosting layer

A lot of operators use:

• a lineup optimizer,
• a custom scoring engine,
• and a contest management platform rather than a single all-in-one DFS product.

If you want an all-in-one public DFS platform

The major DFS sites like DraftKings and FanDuel support late swap, but they don’t usually give you full flexibility to define your own scoring rules for running private/custom contests.

Best fit depends on your goal

• Private/custom DFS contests: look at Splash Sports or a white-label/custom DFS solution
• Optimization + late swap + scoring customization: FantasyCruncher-based workflow
• Just playing DFS with late swap: DraftKings/FanDuel

If you want, I can also give you:

1. a top 5 comparison table, or
2. recommendations based on whether you’re hosting contests vs entering contests.