New Eridu toolkit // reviewed 2026-10-08

Stop guessing. Start optimizing your discs.

Grade every drive disc in seconds, compare crit ratios with real math, and budget pulls with the full pity model. Free, instant, no sign-up.

Built because "is this disc good?" deserved better than eyeballing substats. All game values are community-modelled — see exactly what we assume.

The toolkit

Grade any disc: roll value %, crit value, and which substats are dragging it down.

Expected hit, crit and non-crit numbers from your ATK, bonuses and crit stats.

Is 70/140 better than 55/180? Expected-value math with next-substat advice.

Pity, guarantee and polychrome budget — odds for your next ten-pull and beyond.

Your question	Use
"Is this drive disc worth leveling?"	Disc Scorer
"How much damage does my build actually hit?"	Damage Calculator
"70/140 or 55/180 — which crit ratio wins?"	Crit Ratio Analyzer
"Can I guarantee the next S-rank agent?"	Pull Planner
"How do disc rolls even work?"	Disc rolls explained

No ads, no account, no paywall. The tools are the product — not you.
Everything runs in your browser. Nothing is uploaded; the pull planner keeps its data in your own browser storage.
Patch-reviewed data policy. Roll caps and pity values carry their review date, with every formula on the methodology page.
Honest about uncertainty. Community estimates are labeled [VERIFY], never dressed up as official.

Substat pools, roll counts, and why a "bad" disc can still be god-tier for one agent.

The 2×CR + CD convention, the 1:2 rule, and when to break it.

What f2p income really is per patch, and how to budget for a guarantee.