Proton Pass encrypts metadata — email addresses, URLs, notes fields — not just vault content. Bitwarden encrypts URLs. Neither encrypts all metadata by default. But Proton Pass goes furthest on field-level encryption. Bitwarden goes furthest on control: self-hosting, open source server, emergency access.

What you get that Proton Pass doesn't offer

Self-hosting — vault stays on your own infrastructure. Emergency access delegation — Proton Pass has no equivalent; recovery score 6.9 vs 4.5.

More mature product — Proton Pass launched in 2023; browser extension stability issues documented in early releases.

What you give up

Proton Pass's metadata encryption — the most comprehensive field-level encryption in the category, covering email addresses, URLs, and note fields. Swiss jurisdiction. Built-in email alias integration. Open source clients (Bitwarden has open source server too; Proton Pass clients only).

What you get that Bitwarden doesn't offer

Metadata encryption on email addresses, URLs, and notes — the most comprehensive field coverage in the category. Swiss jurisdiction with strong statutory privacy protections. Built-in email alias integration (create aliases directly from autofill). Proton ecosystem integration if you use Proton Mail or VPN.

What you give up

Self-hosting — Proton Pass is cloud-only. No emergency access or account recovery delegation. Product maturity: launched 2023, still accumulating its audit history compared to Bitwarden's longer track record.