About Snap Theory

Snap Theory is an independent research site for NFL bettors who want evidence instead of hunches. You bring an idea; we show how it would actually have done against real closing lines, and how likely it is that the result was just luck.

What you can do here

• Backtest a strategy on spreads, totals or moneylines, with filters for teams, opponents, line ranges, seasons and more.
• See this week's games with each team's record against the spread and the total, and which tested systems apply.
• Research player props with hit rates, game logs, fair odds and how the opponent defends the position.
• Search thousands of strategies at once, with every result checked on seasons it wasn't built on.
• Learn the basics: break-even rates, sample size, closing lines and more.

What we're not

• Not a sportsbook. You can't place bets here, and we don't link to sportsbooks or earn money when you bet.
• Not a picks service. We don't sell or promote picks. Every result is a historical test you can reproduce yourself.
• Not a promise. Past results don't guarantee future results. Most strategies that look profitable on paper don't hold up, and we try to make that obvious rather than hide it.

Our approach

• Real prices. Every bet is graded against the closing line and, where recorded, the actual closing odds. Why closing lines?
• The real bar. Results show the win rate you needed at those odds, not just whether you won more than half. Break-even explained.
• Honest statistics. A luck check on every backtest and out-of-sample checks in the finder, because a small winning sample proves very little. Skill or luck?
• Fast and free. Backtests run on your own device, so results are instant, however many strategies you try.

Where the data comes from

Game results, closing spreads, totals and moneylines, and weekly player statistics come from the open-source nflverse project, covering every NFL season since 1999. The data updates automatically every day during the season.

How the site is funded

Snap Theory is free to use. It's supported by advertising, and we're building an optional Premium plan with deeper history and more filters. See what's planned. Advertising never affects the results you see.

Responsible use

Snap Theory is for adults 21 and over, for research and entertainment. If betting stops being fun, or you're spending more than you planned, help is free and confidential: call or text 1-800-GAMBLER or visit ncpgambling.org.

Contact

Questions, ideas or a data problem? Email snaptheoryadmin@gmail.com or see the contact page. For weekly patterns and system plays, follow @snaptheoryapp on X.