D20 Attack! for Pathfinder app for iPhone and iPad

d20 Attack is a free Pathfinder attack/damage roll calculator that speeds up Pathfinder games so you can focus on your adventure, not the arithmetic.

d20 Attack intelligently calculates attack & damage rolls for your custom Pathfinder characters. Attack and damage modifiers auto-adjust based on the weapons, feats, and conditional modifiers your character is using. Critical hits and iterative attacks are fully supported. Comes preloaded with all weapons and combat-relevant feats from the Pathfinder Core Rulebook, and a wide selection of conditional modifiers. Advanced users can add custom modifiers to the attack and damage roll calculations.

Features include:

-Completely free to use
-Supports Pathfinder Core Rulebook
-Stores your character information (class, level, stats, feats, etc)
-Save multiple characters
-All combat relevant feats from supported materials
-All weapons from supported materials
-Comprehensive list of conditional modifiers (flanking, invisible, etc)
-Easily edit weapons giving them magical properties (enhancement bonus’s, flaming, keen, etc)
-Iterative Attacks!
-Detail view showing key steps of the calculated attack and damage rolls
-Critical Hits!
-Calculates attack and damage rolls based on your characters stats, weapons, feats, and other miscellaneous modifiers

Usually D20 Attack! for Pathfinder iOS app used & searched for