I go through lots of graph paper, so to save a little money I made a LaTeX template to print my own. It was so handy that @duetosymmetry and I turned it into a LaTeX package.
There are various grid styles (graph, quadrille, hex, iso, dot grid, etc), and both custom and pre-defined color schemes.
Use it to easily print your own paper, or to make pdf page templates for your favorite tablet note-taking app.
Github: https://github.com/mcnees/LaTeX-Graph-Paper
CTAN: https://ctan.org/pkg/gridpapers?lang=en
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@mcnees @duetosymmetry For those willing to use a web-based solution, https://incompetech.com/graphpaper/ has many options.
@peterdrake @mcnees @duetosymmetry that service costs me the ad revenue it makes.