▲ BuildLab
Build planners and ratio calculators for the games we can't stop optimizing. Plan your Slay the Spire 2 deck before you climb, or size a Dyson Sphere production line to the exact assembler.
Open STS2 Deck Planner Open DSP Calculator Open Olden Era Damage CalcSlay the Spire 2 — Deck Planner
Theory-craft decks by character, see damage & block per energy, energy curve, and automatic archetype detection. Share builds with a link.
FactoryDyson Sphere Program — Ratio Calculator
Pick a target item and rate, get the full production chain: every intermediate, building counts by tier, and raw resource totals.
StrategyHoMM: Olden Era — Damage Calculator
Min/avg/max damage with the real (20+ATK)/(20+DEF) formula, luck & morale odds, ranged penalties, kill counts and expected retaliation. Share any matchup with a link.
More tools on the way
Factorio: Space Age ratios, Balatro joker synergy explorer, Hades II boon planner. Patrons vote on what ships next.
Why BuildLab?
Most calculators die when their maintainer moves on. BuildLab's tools share one tiny engine and plain-JSON game data, so updating for a patch is a five-minute data edit — not a rewrite. It's a hobby project built to survive.
Open data
Spotted a wrong card value or recipe after a balance patch? Every number lives in a readable data file. Send a correction and it ships the same day.