Tools and Calculators
Optimize your runs with powerful planning tools
Combat & Bosses
Damage Calculator
Compute exact damage with all modifiers
Boss Relic Picker
Rank three boss relic offers against your current run
Doom Calculator
Calculate Doom execution thresholds and lethal timing
Rest Site Optimizer
Decide between Rest, Smith, and relic actions at campfire
Boss & Elite Guide
Threat tier, tags and counter tips for every boss and elite in the game
Defect Orb Calculator
Plan Defect orb damage with any Focus and orb count. Simulates Lightning, Frost, Dark, Glass, and Plasma orb passives and evokes.
Poison Calculator
Calculate poison lethal turns for Silent. Plan Catalyst timing, track Noxious Fumes and Envenom stacking.
Encounter Pool
Every combat in Slay the Spire 2, grouped by act and room type with monster line-ups and HP
Deck & Planning
Reward Helper
Rank card rewards against your current deck
Build Planner
Plan and optimize your deck
Tier List Maker
Create and share your own card rankings
Deck Analyzer
Check your deck's cost curve, type balance, and health
Shop Helper
Rank shop cards, relics, potions and card removal by value-per-gold for your run
Upgrade Priority
Select your character and deck to see which cards to upgrade first at campfires.
Analysis & Reference
Event Decision Helper
Rank event choices against HP, gold, and deck needs
Run Log Analyzer
Load local run history and see win rates by character, card and relic
Co-op Team Builder
Pick a 2-4 player team and see pair synergies plus which cards/relics belong on each character
Draw Probability
Calculate the exact odds of drawing your key cards using hypergeometric distribution.
Epoch Timeline
Complete epoch timeline with unlock conditions, lore, and reward tracking for cards, relics, and potions.
Version Compare
Side-by-side compare of the live Main branch and current Beta branch — current versions, sync status, and any beta-only changes still outstanding.
STS2 MCP
Set up the STS2 MCP mod to let an AI agent auto-play your runs
Spire Echoes
Play an original fan-made browser card roguelike with elemental resonance combos
Builds Database
Curated S/A/B tier deck builds