Hunch vs PredictionBook vs Fatebook
an honest comparison
This page exists to help you choose — not to win you over. Fatebook is a genuinely good, well-established tool with real strengths Hunch does not have: an active community, broader integrations, and an open-source codebase you can inspect, host, or contribute to. PredictionBook — long the best-known open-source tracker — was retired and made read-only in late 2023, and its maintainers now point people to Fatebook; its column below describes it historically. If those things matter to you, they may be the better fit.
Hunch has a different focus: a private, instant calibration journal that works entirely inside your browser with no account and no data leaving your device. The table below shows the factual differences so you can decide for yourself.
| Feature | Hunch | PredictionBook Retired — read-only since late 2023 | Fatebook |
|---|---|---|---|
| No account needed | Yes Start instantly — nothing to create | No Account required | No Sign-in required |
| Data stays on your device | Yes 100% local — browser storage only | No Stored on its servers | No Stored on its servers |
| Free | Yes | Yes | Yes |
| Open source | Source not public yet | Yes | Yes |
| Brier score & calibration | Yes Brier score + over/under-confidence readout | Yes Calibration tracking | Yes Calibration + Brier score |
| Reminders / due dates | Shows what's due in-app No push notifications by design | Due dates Historical — retired, no live reminders | Yes Email reminders + Slack integration |
| Sharing / community | Private personal journal No sharing or community features | Public predictions Read-only archive — community no longer active | Yes Sharing & team features |