Quill

Quill is a private, end-to-end encrypted messenger built for business teams that take confidentiality seriously.

Every message, photo, file, voice note and call is encrypted on your device with the Signal Protocol — the same cryptography trusted by security professionals worldwide. Our servers relay only ciphertext: we cannot read your conversations, and neither can anyone else.

PRIVATE BY DESIGN

- End-to-end encryption for every conversation (Signal Protocol: X3DH + Double Ratchet with perfect forward secrecy)

- Zero-knowledge server — no message content is ever stored server-side; undelivered messages wait as encrypted blobs and are purged on delivery

- Encrypted voice calls secured with DTLS-SRTP

- No ads, no trackers, no analytics SDKs, no advertising identifiers

BUILT FOR TEAMS

- Invite-only: accounts are created by your organisation's administrator, so you always know who can reach you — there is no public sign-up

- Private group chats with member verification and admin-only posting

- Share photos, files and voice messages — all encrypted

- Fast, familiar chat experience across Android, Windows and iOS (coming soon)

SECURITY THAT GOES FURTHER

- PIN or biometric lock before the app opens, with automatic locking after inactivity

- Screenshot blocking to protect conversations from screen capture

- Disappearing messages, one-time view media, and a full ephemeral mode that keeps no history at all

- Local data protected with encrypted storage (SQLCipher)

- Privacy-respecting push notifications that never contain message content

WHO IS QUILL FOR?

Quill is designed for businesses, teams and professional groups that need genuinely confidential communication — legal, finance, healthcare, management, or any team whose conversations shouldn't live on someone else's servers in plain text.

GETTING STARTED

Quill is invite-only. Your organisation's administrator creates your account and gives you your credentials. If your organisation doesn't use Quill yet, visit https://quill.clareinfotech.com or contact [email protected] to get set up.

Privacy policy: https://quill.clareinfotech.com/privacy

Terms: https://quill.clareinfotech.com/terms