The MHUR Tuning Optimizer is a fan-made tool for My Hero Ultra Rumble that helps you figure out which costume best fits the Tuning effects you actually want, instead of manually checking dozens of costumes one at a time. Pick a character, choose the effects you're after — Max HP+, Quirk Skill Attack Power+, a specific Special Tuning, whatever — and it ranks every costume by how well it can actually fit them, slot by slot, restrictions and all.
Tuning level values come from community-sourced data on the effects shown in-game, cross-checked against a public good-to-knows writeup. Percentage-based stats (Attack Power+, Defense+, Reload+, Speed+) stack multiplicatively when you equip more than one — two +2.5% cards compound to +5.0625%, not a flat +5%. Flat stats (jump height, Max HP+/GP+) just add up directly. The "📊 Tuning Totals" button on a build shows the actual combined total for everything currently equipped, Fixer stat doubling included.
When you pick a set of desired effects, every costume is ranked by a buff value — a single number that measures how well that costume's slots can actually equip the effects you asked for, with every filled slot assumed to be at its max level. A higher buff value means the costume fits your selected effects better; it's a ranking aid, not an in-game stat. For the real combined percentages, use "📊 Tuning Totals".
The value rewards fitting more of your chosen effects and rewards stronger slots more heavily — Hero/Villain-restricted slots (which reach level 4 instead of 3) and, for Monoma, the Fixer column-doubling both count for more. Special-tuning slots act as a hard filter: a costume must be able to hold them, but they don't add to the score. Whatever build the score describes is exactly the build the app recommends for that costume — the number and the placement can never disagree. Open any costume in the results to see its full scoring breakdown.
Effect priority changes what "best" means. With priority off, placement maximises the total buff value across all your effects. With priority on, the optimiser first gets the biggest possible result for your #1 effect — stacking as many #1 cards into the best slots as physically fit — then optimises #2, then #3, and so on. A high-priority effect can crowd lower ones out of a slot entirely, so turning priority on can lower the total buff value; when it does, the score simply reports the true value of the priority-respecting build it recommends.