About the data

Source

Every pitch, batted ball and plate appearance on this site is Statcast data originating with MLB Advanced Media and published by Baseball Savant (baseballsavant.mlb.com).

Player identity -- names resolved from MLBAM ids -- comes from the Chadwick Baseball Bureau register: Player identity data is licensed ODC-BY from the Chadwick Baseball Bureau register, imported weekly.

What's computed here versus sourced

The raw pitch-by-pitch data is sourced from Baseball Savant. Every metric shown on this site -- every rate, average and count -- is computed from that raw data by Armside's own pipeline, not copied from a leaderboard. Each one is checked nightly against Baseball Savant's own published leaderboard figures for qualified players, at a documented tolerance per metric. A metric's exact formula, inputs and known caveats are on its own methods page, linked from every column header and listed in full at /methods.

Use of this data

Charts, CSV exports and every other view on this site carry attribution to MLB Advanced Media and Baseball Savant. Exports here are aggregated and derived views only -- there is no per-pitch raw data available for bulk download or redistribution.

The attribution string drawn on every chart, PNG and OG image: "Armside · Data: MLB Advanced Media / Baseball Savant"

The attribution carried as a leading comment on every CSV export: "Data: MLB Advanced Media / Baseball Savant (baseballsavant.mlb.com). Aggregated and derived by Armside. Aggregated values only."