Best Open-Source Calendly Alternatives (2026)
4 self-hostable, open-source projects that replace Calendly — without per-seat fees for multiple event types. Each is scored for how hard it is to self-host, with one-click deploy options where they exist.
Calendly's pricing is per seat, and the features most people actually want, multiple event types, team scheduling, and integrations, sit on the paid tiers, so a few users quickly adds up. Self-hosting removes per-seat billing and keeps your booking data and customer contact details on your own infrastructure.
Our picks at a glance
Difficulty 3/5 with a One-Click deploy option, the lowest-friction path among the Calendly-style schedulers here.
The most feature-complete option, with team scheduling, many event types, app integrations, and an API, explicitly built as the open-source Calendly.
At ~36,000 stars it has by far the most momentum and the largest contributor community of this group.
Offers an official managed cloud (managed:yes) so you can use it without self-hosting, with the same codebase available to self-host later.
Compare all 4 alternatives
Tap a column header to sort| Project | Deploy | Managed | License | ||||
|---|---|---|---|---|---|---|---|
 Cal.com TypeScript | 36k ★ | 3/5 Moderate | One-Click Docker +2 | AGPL-3.0 | 14 days ago | Repo | |
 Rallly TypeScript | 5k ★ | 3/5 Moderate | One-Click Docker +2 | AGPL-3.0 | 25 days ago | Repo | |
| 4.2k ★ | 3/5 Moderate | Docker Docker Compose +1 | GPL-3.0 | 19 days ago | Repo | ||
 Tymeslot Elixir | 300 ★ | 3/5 Moderate | Docker Docker Compose +1 | Elastic-2.0 | 1 month ago | Repo |
What to look for: Confirm the tool covers your booking model: one-on-one links and round-robin/team scheduling (Cal.com), group availability polls (Rallly), or fixed service appointments with providers (Easy!Appointments). Check calendar sync (Google/Microsoft/CalDAV), timezone handling, and whether the integrations and reminders you rely on are included rather than gated.
The alternatives, reviewed
- #1
Cal.comSelf-host: ModerateScheduling infrastructure for everyone, the open-source Calendly alternative
36k TypeScript AGPL-3.0 14 days agoHow it compares to Calendly
- Some enterprise features (e.g. SAML SSO, advanced admin/insights, certain platform features) are gated behind a commercial/EE license even when self-hosting.
- Self-hosting requires PostgreSQL plus configuring numerous environment variables and OAuth credentials for calendar integrations.
- The core code is AGPL-3.0, which imposes copyleft obligations on modified network deployments.
- Upgrades between major versions occasionally require manual database migration work.
- #2
RalllySelf-host: ModerateSelf-hosted scheduling polls to find the best time for a group to meet
5k TypeScript AGPL-3.0 25 days agoHow it compares to Calendly
- Focused on group availability polling rather than one-on-one booking pages, so it does not replace Calendly's personal booking links.
- No direct calendar-availability checking or two-way calendar sync to auto-block busy times.
- No built-in payment collection or paid-appointment support.
- Requires PostgreSQL and SMTP configuration to self-host; not a single-binary deploy.
- #3
Easy!AppointmentsSelf-host: ModerateSelf-hosted appointment scheduler for service businesses with provider and service management
4.2k PHP GPL-3.0 19 days agoHow it compares to Calendly
- No built-in payment collection at booking time, unlike Acuity/Calendly paid tiers.
- Calendar sync is limited to Google Calendar; no native Outlook/Office 365 or CalDAV support.
- The UI and admin experience feel dated compared to commercial products.
- Lacks advanced features like automated reminder workflows, packages/memberships, and intake form logic found in Acuity.
- #4
TymeslotSelf-host: ModerateElixir/Phoenix meeting scheduling platform you can self-host
300 Elixir Elastic-2.0 1 month agoHow it compares to Calendly
- Younger and smaller project than Cal.com, with a more limited integration and app ecosystem.
- Licensed under the Elastic License 2.0, which is source-available rather than OSI-approved open source and restricts offering it as a competing managed service.
- Fewer calendar providers and payment options than mature commercial tools.
- Self-hosting requires an Elixir/OTP and PostgreSQL setup, which is less familiar to many ops teams.
The verdict
Cal.com is the clear direct replacement for Calendly, matching it feature for feature with self-host or managed-cloud options and a huge community. Choose Rallly instead only if you mainly need group availability polls, or Easy!Appointments if you run a service business with fixed providers and bookable services.
Calendly alternatives — frequently asked questions
What is the best open-source Calendly alternative?
Cal.com. It is explicitly positioned as the open-source Calendly alternative (AGPL-3.0, ~36,000 stars), supports multiple event types and team scheduling, and offers both self-hosting and a managed cloud.
Is there a free Calendly alternative I can self-host?
Yes. Cal.com, Rallly, Easy!Appointments, and Tymeslot are all open source and self-hostable. Cal.com is the closest one-to-one Calendly replacement; Easy!Appointments suits service-business booking.
Which Calendly alternative avoids per-seat pricing?
Any of the self-hosted options removes Calendly's per-seat fees because you run them yourself. Cal.com gives you unlimited event types when self-hosted, which is the main thing Calendly charges to unlock.
Which is easiest to self-host?
Cal.com is rated 3/5 and offers a One-Click deploy, making it the smoothest setup here. Rallly and Easy!Appointments are also 3/5 but lack the one-click path.
Can a group vote on the best meeting time like a poll?
Use Rallly for that. It is built specifically for group availability polls to find a time that works for everyone, which is a different use case from Calendly's fixed booking links.
Is there a managed-hosting option if I don't want servers?
Cal.com, Rallly, and Tymeslot all offer official managed hosting (managed:yes). Easy!Appointments is self-host only.