FatePool Odds Desk iconFatePool Odds Desk

Education · Balance studio

FatePool Odds Desk

Lock dice pools, deck draws, and bag compositions into hard distribution curves before the playtest ever hits the table—side-by-side proofs, not gut-feel fairness arguments.

Exact math Monte Carlo Compare Arena Balance Briefs
FatePool Odds Desk app icon

Workshop mood

Ember-table precision for designers who model risk before plastic hits wood.

A hands-on probability desk for the design table

FatePool Odds Desk is the balance studio for board-game designers, playtesters, and heavy-euro tinkerers who refuse to ship a randomizer on vibes alone. Open a seeded system, configure faces, card counts, bag tokens, and success rules, then compute exact or Monte Carlo outcome curves with swing and fail-chance readouts. A/B your variants in Compare Arena, freeze a shareable Balance Brief for the design group, and keep every project local with named variants ready for the next rules pass.

Seed Workbench, instant sandbox

Browse filled seeds—Iron Spire 2d12+skill, Lantern Bag seasons, Crown Deck intrigue, Ember push-your-luck, Tide exploding d6—then duplicate any into an editable project.

Dice pools with full histograms

Set face counts, modifiers, success thresholds, exploding/reroll toggles, and keep-high/keep-low rules, then render outcome histograms and cumulative chance tables.

Exact deck & bag math

Run hypergeometric multi-card draws and suit thresholds, or scrub bag token pulls with reshuffle-on-empty to watch composition drift across sequential draws.

Compare Arena verdicts

Overlay two variant curves, surface delta callouts on mean, variance, and fail chance, and get a safer-vs-swingier verdict chip for the design table.

Risk Meters & Balance Briefs

Tune bust chance, crit chance, EV, and score spread live, then freeze locked parameters, key percentiles, and curve snapshots to share with playtest groups.

5
original seed engines onboard
100%
on-device projects & privacy
iOS
native balance desk
12k+
designer sessions logged*

Local craft

Local variants + home Widget

Save unlimited SwiftData projects with named variants, pin a favorite curve to the home screen, and open the How Math Works primer on exact vs simulated modes. Sample engines are original fictional kits—so you model risk without touching commercial rule text.

Iron Spire Lantern Bag Crown Deck Ember Tokens Tide Dice

About the desk

FatePool Odds Desk is built for the moment between “this feels fair” and “the table will actually believe the math.” The core loop is open a seeded randomizer system → configure faces, card counts, bag tokens, and success rules → compute exact or Monte Carlo distributions with swing and fail-chance readouts → A/B compare variant curves → freeze a shareable balance brief for the design group.

Everything stays on-device. Projects, variants, and briefs never need a cloud account. You ship the curve you can defend—not the one that survived one lucky playtest.