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Essentialist vs Space: catalog facts
Essentialist	Space
Free Free and open source under the MIT license.	Freemium Core study features are free; Pro adds unlimited AI features.
Windows, macOS, Linux, Android	Windows, macOS, Linux, Android, iOS
Flashcard decks are plain Markdown files Keeps data on the device without network access	Uses FSRS-6 to schedule reviews Imports Anki decks and common spreadsheet formats
Does not support images in cards No built-in sync service	Unlimited AI features require Pro
Downloadable app	Downloadable app
Open source	Closed source
License: MIT	License: Proprietary
No account needed	Not stated if an account is needed
Works offline	Not stated if it works offline
Official website Full listing and sources Checked October 8, 2026	Official website Full listing and sources Checked October 8, 2026

Catalog facts only. Anything “not stated” is unconfirmed. Check full listings for details.