PredictIt vs Good Judgment Open
A detailed head-to-head comparison of PredictIt and Good Judgment Open — pricing, features, and which one wins for different use cases.
PredictIt
Long-running US political prediction market run for academic research
PredictIt is one of the longest-running prediction markets in the US, operated as a research project (historically in partnership with Victoria University of Wellington) and focused primarily on polit…
Full review →Good Judgment Open
The public forecasting tournament from the Superforecasting researchers
Good Judgment Open is the public forecasting platform run by Good Judgment Inc., the organisation born out of the research that produced the concept of 'Superforecasters' — ordinary people who, with t…
Full review →Feature Comparison
| Feature | PredictIt | Good Judgment Open |
|---|---|---|
| Settlement Mechanism | Platform resolution | Admin resolution |
| Trading Model | Order book (capped) | Forecast tournament (no money) |
| Collateral Token | USD | None (Brier score) |
| Min Trade | $1 | N/A |
| Api Access | ✓ | ✗ |
| Embeddable Odds | ✓ | ✗ |
| Geo Restrictions | US-focused | None |
| Market Creation | Platform-approved | Platform-set |
| Mobile App | ✓ | ✗ |
| Governance Token | ✗ | ✗ |
PredictIt Pricing
PredictIt
Free to trade (fees apply)
Free
- ✓Real USD markets
- ✓US political focus
- ✓5% profit fee + 5% withdrawal fee
- ✓Per-market position caps
- ✓Long historical record
Good Judgment Open Pricing
Good Judgment Open
Free to trade
Free
- ✓Forecasting tournament
- ✓Geopolitics/economics/science questions
- ✓Brier-score accuracy tracking
- ✓Superforecaster methodology
- ✓Free to participate
Verdict: Which Should You Choose?
PredictIt is the better pick if you need long-running, widely-cited us political market. Good Judgment Open wins when backed by the research behind superforecasting. Both are production-ready — the right choice depends on your team's workflow and budget.