Peergos

Audited by Cure53 in May 2019.

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Screenshot of the Peergos website

Audited by Cure53 in May 2019.

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Peergos alternatives

Proton Calendar Select the "Mail Plus" or "Proton Unlimited" paid plans for more features.

Tutanota Tutanota: Free, Cross-Platform and Zero-Knowledge Calendar

EteSync If you decide to self-host EteSync you won't have to pay for the subscription. Tutorial here .