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Open Archiver vs Piler: catalog facts
Open Archiver	Piler
Freemium Free to self-host; a paid Enterprise Edition adds extra features.	Free Free and open source to download and self-host.
Web, Self-hosted	Self-hosted
Imports from Google Workspace, Microsoft 365, IMAP, PST and mbox Searches inside attachments as well as message text	Tamper-evident archiving with retention policies Full-text search with filtering across archived mail
Some features are reserved for the paid Enterprise Edition Aimed at organisations, so heavier than personal archivers	Requires running and maintaining your own server Aimed at organizations rather than individual users
Self-hosted	Self-hosted
Open source	Open source
License: AGPL-3.0	License not stated
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 Checked October 2, 2026	Official website Full listing and sources Checked October 2, 2026

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