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Piler vs Bichon: catalog facts
Piler	Bichon
Free Free and open source to download and self-host.	Free Free and open source under the AGPL-3.0 licence.
Self-hosted	Web, Self-hosted
Tamper-evident archiving with retention policies Full-text search with filtering across archived mail	No external database required Unified full-text search across accounts
Requires running and maintaining your own server Aimed at organizations rather than individual users	Only archives mail; it cannot send or reply IMAP is the main source for downloading mail
Self-hosted	Downloadable app, 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.