Compare software

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