Rebuttal

Rebuttal is a forecasting practice app built around one idea: before you commit to a probability, you should have to defend it. Pick a real-world question in politics, economy and rates, crypto, AI and tech, sports or culture. Put a number on it, then debate it with an AI opponent in a chat. The opponent argues only from market data: how far venues disagree, how trading volume changed, and how the consensus moved over 24 hours and 7 days. No invented news, no betting talk, no financial advice. HOW IT WORKS - Pick a question. Each card shows the consensus probability, how much venues disagree and the 7-day change. - Set your estimate. Read the trend chart, the venue comparison and the volume, then move the slider. - Spar. The AI pushes back with a short counterpoint grounded in the numbers. Reply in your own words, adjust your estimate or hold your ground. - Lock your position. Every debate is saved as its own thread, so you can leave and pick it up later. RE-SPAR When the consensus moves past your threshold, from ±5 to ±20 points, the opponent picks the argument back up in the same thread. The conversation grows with your position. SPARRING IMPACT Rebuttal compares your estimate before and after each debate with what actually happened. Follow your Sparring Effect over time, compare accuracy before and after debating, see which categories you reason best in, and track an overall calibration score from 0 to 100. ALSO INSIDE - Watchlist for events you want to follow without taking a position - Daily streak and a Weekly Digest with one coaching note based on your own stats - Direct or Socratic tone for the AI opponent - Probabilities shown as percentages or decimals - Share cards for your debates and your stats NO ACCOUNT NEEDED There is no sign-up. Your debates, watchlist and statistics are stored on your device. READ-ONLY BY DESIGN Rebuttal is a tool for practicing forecasting and reasoning. It does not execute trades, accept deposits, hold funds or pay out anything, and it is not affiliated with any prediction market. AI messages are generated automatically and may be inaccurate. Nothing in the app is financial advice.