NegativeEV

NegativeEV is a sports betting analysis tool that evaluates whether a bet represents good, bad, or fair value. You submit a wager by text or screenshot, and the system matches it to the current slate, runs it through play-by-play game simulations, and returns a verdict with an explanation of why the price is or isn't favorable.

The problem it goes after is one that casual bettors hit constantly. You see a line, it feels like it might be good, but you have no way to know if the sportsbook is offering fair odds or if you're paying a premium for a popular pick. NegativeEV gives you a second opinion backed by simulation data rather than gut feeling.

The core mechanic is comparing the offered odds against simulated outcome distributions. The system doesn't just give you a number and leave you guessing. It explains its reasoning, so you understand what's driving the grade. If a player prop looks overpriced, you'll see why the simulation expects different numbers than what the book is implying.

It covers several sports and market types. MLB gets moneylines, run lines, totals, and player props including hits, home runs, strikeouts, and total bases. WNBA, PGA, and ATP tennis are also supported. The focus is on markets where simulation data can actually inform the valuation rather than pure randomness.

The free tier gives you ten checks per day without logging in. Register for an account and you get unlimited checks with a per-hour pace limit applied to prevent abuse. That's generous enough for most recreational bettors who want to sanity-check a handful of picks before placing them.

One limitation to know about is how it handles in-progress games. The tool analyzes bets using pre-game simulations, so if a game has already started, you're getting the pre-game projection rather than live-adjusted analysis. It identifies which games have begun and notes when the slate will re-simulate, but it won't update mid-game.

Beyond the bet checker, the site offers educational content on expected value, line shopping, parlay analysis, and sport-specific strategy. There's also an API catalog and an MCP server for AI agent integration, which suggests the tool is being built with developers and automation in mind. If you're someone who wants to approach betting with more rigor than vibes, NegativeEV gives you a way to check your picks against data before you commit.