Twake Calendar
Twake Calendar is an open-source calendar for teams and organizations to coordinate schedules, plan meetings, and manage data under their control.
What Twake Calendar is
Twake Calendar is an open-source calendar for teams and organizations to coordinate schedules, plan meetings, and manage data under their control. Users can create events, invite participants, share video conferences, and handle schedules in one place. Shared calendars, delegation to trusted teammates, and availability grids for reserving time slots support team coordination. It supports CalDAV and importing or exporting iCalendar (.ics) files, and integrates with Twake Mail, Chat, Drive, and Visio for invitations, event sharing, video meetings, and attachments. Twake Calendar is available for Android, iOS, Linux, macOS, Windows, web, and self-hosting. It can be used as a standalone open-source application or as part of Twake Workplace, hosted as SaaS or self-hosted. The maker says open-source code and self-hosting allow organizations to inspect the software and retain control over infrastructure and data. Twake says it does not provide official technical support for self-hosting setups and refers users to its community.
Good
- Supports shared calendars and delegated access.
- Availability grids let others reserve time slots.
- Supports CalDAV and iCalendar import and export.
- Available as self-hosted or hosted SaaS.
Watch out
- No official technical support for self-hosting setups.
Who it suits
Twake Calendar suits teams and organizations that need shared scheduling, meeting coordination, or delegated calendar management. It may be a fit for organizations that want to self-host and retain control over infrastructure and data.
Verdict
Twake Calendar offers team scheduling, integrations, and self-hosting alongside mobile, desktop, and web access. Organizations considering self-hosting should account for the lack of official technical support for those setups.
Plans and prices
From Twake Calendar's own pricing page, checked 14 Oct 2026.
| Plan | Price | What it gives you |
|---|---|---|
| Standard | €4 a month | 50 GB cloud storage · 15 GB + unlimited mail/day · instant chat messaging · advanced support · Office documents editor · collaborative notes · unlimited authorized devices · monthly |
| Premium | €12 a month | 1000 GB cloud storage · 500 GB + unlimited mail/day · instant chat messaging · advanced support · Office documents editor · collaborative notes · unlimited authorized devices · monthly |
| Starter | €9 a month | Mail, Drive, Chat, Calendar · team workspaces and shared folders · standard admin controls · basic security settings · community support · €9 / user / month |
| Discover | — | 5 GB cloud storage · 1 GB + 100 emails/day · instant chat messaging · advanced support · collaborative notes · unlimited authorized devices · monthly |
| For companies | Priced on request | Enterprise offer · contact sales |
The facts
Each one read from Twake Calendar's own pages, with the date it was checked.
What it does
- Availability booking
- Users can publish availability slots so others can reserve meetings through a booking grid.checked 14 Oct 2026
- CalDAV and iCalendar
- Twake Calendar supports CalDAV synchronization plus importing and exporting iCalendar .ics files.checked 14 Oct 2026
- Calendar codebase
- The public calendar frontend is a React and TypeScript monorepo with private and public applications and CalDAV/CardDAV integration.checked 14 Oct 2026
- Calendar licence
- The Twake Calendar frontend repository is published under the GNU Affero General Public License 3.0.checked 14 Oct 2026
- Calendar sync
- Twake Calendar supports CalDAV and importing or exporting calendars in iCalendar (.ics) format.checked 11 Oct 2026
- Delegation
- Calendar owners can authorize trusted colleagues to manage calendars on their behalf.checked 14 Oct 2026
- Deployment
- The product is offered as SaaS and as software that organizations can self-host.checked 14 Oct 2026
- Desktop and mobile
- Twake's download page lists Windows, Intel Mac, Apple Silicon Mac, GNU/Linux, Google Play, and the App Store downloads.checked 11 Oct 2026
- Developer API
- Twake documentation describes an API for creating applications, authenticating with Postman, sending messages and triggering commands.checked 14 Oct 2026
- Documentation and support
- The help center contains calendar guides for creating, editing, deleting, recurring and duplicating events, plus mobile synchronization help.checked 14 Oct 2026
- Encryption statement
- Twake states that Workplace messages and attachments use zero-access encryption, with decryption keys kept on user devices.checked 14 Oct 2026
- Events and meetings
- Users can create events, invite participants, share video conferences, and manage their schedule in one place.checked 11 Oct 2026
- Files and notes
- Calendar events can access Twake Drive documents and Twake notes.checked 14 Oct 2026
- Independent review limit
- It's FOSS reported slower login performance and said the hosted free plan then limited users to one workspace and excluded guest collaborators.checked 14 Oct 2026
- Independent review praise
- It's FOSS highlighted document storage, Kanban tasks, shared calendars, video conferencing, collaborative Office editing and cross-platform clients.checked 14 Oct 2026
- Independent security criticism
- It's FOSS said free and standard users lacked two-factor authentication in its 2021 review.checked 14 Oct 2026
- Integrations
- The calendar integrates with Twake Mail, Chat, Drive, and Visio for invitations, event sharing, video meetings, and file attachments.checked 11 Oct 2026
- Limit: mobile uploads
- Apple reviewers complained that the mobile app limits photo uploads and cannot upload folders.checked 14 Oct 2026
- Limit: pricing and updates
- A G2 reviewer identified price and update frequency as drawbacks.checked 14 Oct 2026
The company
- Founded
- 2000checked 28 Sep 2026
- Headquarters
- Issy-les-Moulineaux, Francechecked 28 Sep 2026
Money
- Free plan
- Yeschecked 22 Sep 2026
Where it runs
- Google Play app
- Twake Sync ICS synchronizes Webcal and iCalendar feeds with Twake Workplace and Android Calendar, and reports no third-party data sharing and encryption in transit.checked 14 Oct 2026
- Limit: iOS reliability
- Apple reviewers reported black screens, incomplete functionality and problems with mail access on iOS.checked 14 Oct 2026
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