Catch the Ren'Py script bugs that compile fine and only crash in a player's save: unescaped [ and {, define-instead-of-default, tab indents, developer mode shipped. Runs entirely in your browser — nothing is uploaded.
Free here: Scan one .rpy file and name every line that ships broken, with the fix for each.. In the editor: Gate the whole project at once - every .rpy file in the workspace - and export a release report you keep. — that part asks for a licence key.
Same engine as the VS Code extension, byte for byte.