Grammar.
A fast, private grammar and spelling check that runs entirely in your browser. Your text never leaves your device, never goes to a server. Paste a draft and fix the mechanics before you run it through the voice and information-gain checks.
Private by design
Most grammar checkers send every word you write to their servers. This one does not. The engine is compiled to WebAssembly and runs inside your browser, so the checking happens on your machine and nothing is uploaded. It is fast enough to feel instant, and it works offline once loaded.
Grammar and spelling are the mechanics. They are necessary, but they are not what makes writing read as human or earn a citation. Clean the mechanics here, then open Typographer to work on voice, rhythm, and information gain, the things that actually set your page apart.