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CSpell vs PySpelling: catalog facts
CSpell	PySpelling
Best for: Developers checking spelling in code and project documentation	Best for: Developers who want repeatable spelling checks in projects and CI
Free Free and open source under the MIT license.	Free Free and open source under the MIT license.
Command line	Command line
Checks spelling across large projects Supports multiple languages and custom dictionaries All 3 strengths for CSpell Checks spelling across large projects Supports multiple languages and custom dictionaries Integrates with editors and CI workflows	Configurable tasks for different file types Filters specific document content All 3 strengths for PySpelling Configurable tasks for different file types Filters specific document content Can fail CI builds on misspellings
The command-line tool requires a Node.js environment	Requires Python and Aspell or Hunspell Spell checker dictionaries must be available
Downloadable app	Downloadable app
Open source	Open source
License: MIT	License: MIT
Not stated if an account is needed	Not stated if an account is needed
Not stated if it works offline	Not stated if it works offline
Official website Full listing and sources Sources for CSpell cspell.org Catalog checked October 8, 2026	Official website Full listing and sources Sources for PySpelling facelessuser.github.io/pyspelling Catalog checked October 8, 2026

“Not stated” means we have not confirmed it. Features can vary by device and plan.