Purelymail Calendar

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Purelymail Calendar vs Fastmail Calendar

Fastmail Calendar is a paid, fully integrated scheduling product built into the Fastmail web interface. Purelymail by itself ships CalDAV calendar storage without a comparable scheduling UI. Purelymail Calendar is an unofficial open-source web app that fills the gap for Purelymail users.

The pairing is independent of Purelymail and free to use; you only pay for your underlying Purelymail mailbox. The events still live in Purelymail's CalDAV calendar.

Architecture at a glance.

Fastmail Calendar

Front end Fastmail web UI (calendar tab) and native apps.
Scheduling iTIP / iMIP invites, RSVP tracking, recurrence, inbox-to-calendar sync.
Storage Fastmail-hosted CalDAV.
Identity Fastmail mailbox account (paid).

Purelymail (raw)

Front end Purelymail webmail (no calendar tab).
Scheduling Not provided. Use a CalDAV client of your choice.
Storage Purelymail CalDAV at /webdav/.
Identity Purelymail mailbox account (paid, cheaper).

Purelymail + Purelymail Calendar

Front end Purelymail Calendar web UI (this app).
Scheduling iTIP / iMIP invites, RSVP tracking, recurrence, inbox-to-calendar sync.
Storage Same Purelymail CalDAV (events unchanged).
Identity Same Purelymail mailbox. No new vendor account.

Purelymail Calendar replaces only the front-end and scheduling layers. Storage and identity stay on Purelymail.

Feature by feature.

Capability Fastmail Calendar Purelymail (CalDAV only) Purelymail Calendar
Web calendar UI Yes, built in. No. Yes (month / week / day views).
iTIP meeting invites Yes, built in. No. Yes (REQUEST / CANCEL).
RSVP tracking Yes, built in. No. Yes (IMAP poll, PARTSTAT applied).
Recurring events Yes. Storage only. Yes (with single-occurrence cancel).
Inbox invite sync Yes. No. Yes (every 5 minutes).
Email + calendar bundled price Yes (single Fastmail plan). Yes (Purelymail plan, typically cheaper). Free; uses your Purelymail mailbox.
Source available No (proprietary). No (proprietary server). Yes (MIT licensed).
Self-hostable No. No. Yes (Docker compose ships in the repo).
Hosted by Fastmail. Purelymail. You, or purelymailcalendar.com.
Native mobile apps Yes (iOS, Android). Use any CalDAV client. Web only today. Use Apple Calendar or DAVx5 alongside.
Search across email and calendar Yes (unified). No (separate clients). Not unified with mail. Calendar search only.

How to choose.

Pick Fastmail Calendar if

You want a single paid vendor for email and calendar with first-party mobile apps, unified email-and-calendar search, and zero setup beyond signing up. The scheduling and inbox sync just work, and there is no companion app to install.

Pick Purelymail plus Purelymail Calendar if

You already use Purelymail and want the cheaper mailbox while keeping a real scheduling layer, you prefer an open-source companion app you can audit or self-host, and you are comfortable using a CalDAV client on mobile until native apps exist.

Pick Purelymail without Purelymail Calendar if

You only need calendar storage that syncs to Apple Calendar, Thunderbird, or DAVx5, and you do not need to send standards-compliant meeting invites or track RSVPs.

Where to go next.

Sign in to Purelymail Calendar  →