Where Does Spark Mail Store Local Data?
Spark keeps mail cache in app containers on Mac and LocalAppData on Windows. Real messages stay on your mail server and resync on login.
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Spark divides its footprint by generation. Classic builds use a shared Group Container while the newer Desktop builds keep their own Spark Desktop folder with a core-data database inside. Windows mirrors the Desktop side under LocalAppData.
None of these folders is the mailbox. Cached bodies, downloaded attachments and the full-text index live there for speed and offline use. The authoritative mail stays on the provider. Resetting means deleting local state and signing back in, not migrating files between machines.
Where Spark Mail stores this, by platform
~/Library/Group Containers/3L68KQB4HG.group.com.readdle.smartemail
Classic Spark mail data with cached bodies, attachments and search index. Quit Spark before touching it. The beta uses a parallel beta group folder. Deleting signs you out locally while server mail stays intact.
~/Library/Containers/com.readdle.SparkDesktop.appstore/Data/Library/Application Support/Spark Desktop
Desktop generation cache with core-data messages.sqlite plus the search index beside it. App Store builds nest under Containers while direct installs use Application Support. Quit Spark first since the database locks while running.
%LOCALAPPDATA%\Spark Desktop
Windows Desktop cache for the same generation. Holds temporary files and offline cache rather than a portable mailbox like PST. Reset through this folder when the app misbehaves, then sign back in to resync.
Frequently asked questions
How do I clean-install Spark on desktop?
Quit Spark, remove the Spark Desktop folder from Containers or Application Support on Mac, or %LOCALAPPDATA%\Spark Desktop on Windows, then launch and sign back in. Accounts and settings return through sync. Classic builds use the Group Container 3L68KQB4HG path instead.
Will deleting the Spark folder lose my email?
It holds cached mail bodies, attachments fetched for offline use and the search index, not the mailbox itself. Core mail stays with Gmail, Outlook or your provider. That is why deleting the local folder never destroys mail, it only forces a re-download.
How do I reset Spark on mobile?
Open Settings, Apps, Spark, Storage and use Clear Data on Android, or reinstall on iOS. There is no file path to copy on phones. Desktop troubleshooting uses the container folders above instead.
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