FanDuel vs Underdog: Both Started as DFS. One Kept Betting.

FanDuel vs Underdog: Same DFS Roots, Opposite Endings

FanDuel vs Underdog is a comparison between two companies that both started as daily fantasy sports apps and then made opposite bets on sportsbook expansion. FanDuel launched in 2009, added a sportsbook years later, and by September 2026 that sportsbook is live in 24 states plus D.C. Underdog launched in 2020, also built a real-money sportsbook — then shut it down nationwide in December 2025 and went back to pick’em DFS, plus a brand-new CFTC-licensed prediction exchange.

FanDuel and Underdog do not look like they belong on the same comparison page — one is a Flutter Entertainment subsidiary with a 24-state sportsbook, the other is a Brooklyn DFS app that closed its sportsbook entirely. But run the tape back and both companies started in the exact same place: daily fantasy sports, no real-money sports betting at all. What happened after that starting point is the actual story.

2009: FanDuel Starts as Fantasy, Not a Book

FanDuel began in Edinburgh, Scotland in 2009 as Hubdub before rebranding, running salary-cap daily fantasy contests — build a roster under a budget, no sportsbook in sight. It took years, a US headquarters move to New York, and eventually a state-by-state licensing push before FanDuel Sportsbook existed as a product at all. That sportsbook is now the thing most people mean when they say “FanDuel,” live in 24 states plus Washington D.C. as of September 2026, with Arkansas the newest addition on March 20, 2026. Full ownership landed with Flutter Entertainment plc in 2025, after Flutter bought out Boyd Gaming’s remaining 5% stake for roughly $1.76 billion.

2020: Underdog Starts the Same Way

Underdog launched in Brooklyn in 2020 — eleven years after FanDuel, with a different contest format (pick’em instead of salary-cap) but the same non-sportsbook starting point. Underdog eventually built its own real-money sportsbook too, following the same path FanDuel had taken years earlier. The difference is what happened next.

Same move, opposite result. FanDuel’s sportsbook, launched years after its DFS product, is now the company’s primary identity. Underdog’s sportsbook, launched years after its own DFS product, closed nationwide in December 2025 — Underdog settled every open North Carolina wager and walked away from the category rather than keep chasing licenses.

Is Underdog Legit Without a Sportsbook to Point To?

Yes, but it is answering a different question than FanDuel is. FanDuel’s legitimacy rests on a public parent company and 24 state gaming licenses. Underdog’s rests on six years of paid DFS entries, a $17.5 million New York settlement in March 2025 that it paid rather than fought, and a brand-new federal registration stack — Designated Contract Market, Derivatives Clearing Organization, Futures Commission Merchant — behind Underdog Predict, launched July 2026. Closing a sportsbook on its own terms, with every open wager settled, is not the same as being shut down by a regulator.

Is FanDuel Safe Where Underdog Is Not an Option?

In FanDuel’s 24 licensed states, yes, to the extent regulated US sports betting gets safe: a named state license, geolocation, self-exclusion tools, and a public parent that answers to the NYSE and LSE. That safety case does not extend to California, Texas, or Florida — FanDuel Sportsbook simply is not there. Underdog was never a workaround for those dark states either; its DFS products run under a separate exemption with their own state list, and its sportsbook, while it existed, never covered the states FanDuel misses.

Which One for Who

Want a moneyline, spread, or parlay against a house line, and you live in one of FanDuel's 24 licensed states plus D.C.: FanDuel is the one of these two brands still built for that. Want pick’em contests against a posted projection instead: Underdog, checking first whether Classic Pick’em or Pick’em Champions is actually live where you are. Curious about a federally licensed prediction-market product neither company offered a few years ago: that is Underdog Predict, closer in structure to Kalshi than to either brand’s original DFS pitch.

Neither company is presented here as a way to make money. Treat a deposit into either one as entertainment spend, not income.

FanDuel vs Underdog — Frequently Asked Questions

Is FanDuel legit compared to Underdog?

Both are legitimate, differently sized companies. FanDuel is a Flutter Entertainment subsidiary — Flutter trades publicly on the NYSE and LSE — operating under individual state sportsbook licenses. Underdog is privately held, has a real regulatory record too, including a $17.5 million New York settlement in March 2025, and now holds its own CFTC registrations for Underdog Predict. Legitimacy is not really the gap between them; product category is.

Is Underdog the same as FanDuel Sportsbook?

No, and it used to be closer than it is now. Underdog ran its own real-money sportsbook for a stretch before shutting it down nationwide in December 2025, settling every open North Carolina wager rather than keep expanding it. FanDuel Sportsbook is still live and growing — it added Arkansas on March 20, 2026. A reader looking for a moneyline bet on Underdog today will not find one.

Did FanDuel and Underdog both start as fantasy apps?

Yes, thirteen years apart. FanDuel launched in 2009 in Edinburgh (as Hubdub, before rebranding) with salary-cap daily fantasy. Underdog launched in 2020 in Brooklyn with pick’em-style contests. Both later moved into real-money sports betting; FanDuel’s sportsbook survived and scaled into a 24-state, Flutter-owned business, while Underdog’s sportsbook lasted only a few years before the company closed it.

Is FanDuel legal in more states than Underdog?

They are not really comparable maps, because they are different products. FanDuel Sportsbook is licensed and live in 24 states plus D.C. as of September 2026 — dark in California, Texas, and Florida. Underdog's Classic Pick'em runs under the DFS exemption in roughly 15 states and is blocked outright in Connecticut, Hawaii, Idaho, Iowa, Louisiana, Maine, Montana, Nevada, and Washington. A state missing from one list does not predict the other.

Which one should I use — FanDuel or Underdog?

Want to bet a line against a sportsbook, and you live in one of FanDuel's 24 licensed states plus D.C.: FanDuel. Want pick'em-style contests against a projection instead of a house line: Underdog, checking whether Classic Pick'em or Pick'em Champions is the one actually live where you are. Curious about a federally regulated prediction-market product instead of either: that is Underdog Predict, a separate thing from both companies' original fantasy products.