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Best Open-Source Acuity Scheduling Alternatives (2026)

17 self-hostable, open-source projects that replace Acuity Scheduling — without monthly subscriptions per calendar. Each is scored for how hard it is to self-host, with one-click deploy options where they exist.

Acuity bills a monthly subscription per calendar and locks more advanced booking features into higher tiers, which adds up for multi-provider businesses, and it ties you into the Squarespace ecosystem. Self-hosting removes the recurring per-calendar fee and keeps client records, appointment history, and intake data under your own control.

Close-up shot of a hand marking a date on a calendar with a pen, emphasizing planning and scheduling.
Photo by Towfiqu barbhuiya on Pexels

Our picks at a glance

Easiest to self-host
Cal.com

Both are 3/5, but Cal.com adds a One-Click deploy option that lowers setup friction over a manual install.

Most powerful
Cal.com

Far broader feature set, integrations, and API, plus a much larger ecosystem to extend booking workflows.

Most active
Cal.com

~36,000 stars versus ~4,200, with a substantially faster development pace.

Best managed option
Cal.com

Provides an official managed cloud (managed:yes); Easy!Appointments is self-host only.

Compare all 17 alternatives

ProjectDeployManagedLicense
Cal.com
TypeScript
47k ★
3/5
Moderate
One-Click
Docker
+2
AGPL-3.08 days agoRepo
Cal.diy
Nodejs
47k ★
3/5
Moderate
Docker
Docker Compose
+1
MIT8 days agoRepo
QloApps
PHP
14k ★
4/5
Involved
Docker
Manual
OSL-3.020 days agoRepo
Radicale
Python
4.9k ★
2/5
Easy
Docker
Manual
GPL-3.011 days agoRepo
Fider
Docker
4.4k ★
3/5
Moderate
Docker
Docker Compose
+1
MIT5 days agoRepo
Easy!Appointments
PHP
4.3k ★
3/5
Moderate
Docker
Docker Compose
+1
GPL-3.06 days agoRepo
Hi.Events
Docker
3.9k ★
3/5
Moderate
Docker
Docker Compose
+1
AGPL-3.04 days agoRepo
Baïkal
PHP
3.2k ★
3/5
Moderate
Docker
Manual
GPL-3.017 days agoRepo
pretix
Python
2.5k ★
3/5
Moderate
Docker
Docker Compose
+1
Apache-2.03 days agoRepo
Indico
Python
2.1k ★
4/5
Involved
Docker
Docker Compose
+1
MIT4 days agoRepo
SabreDAV
PHP
1.7k ★
5/5
Advanced
Manual
MIT15 days agoRepo
Bracket
Docker
1.7k ★
3/5
Moderate
Docker
Docker Compose
+1
AGPL-3.03 days agoRepo
Schej
Vue
1.7k ★
2/5
Easy
Docker Compose
Manual
MIT29 days agoRepo
Alf.io
Java
1.6k ★
4/5
Involved
Docker
Docker Compose
+1
GPL-3.04 days agoRepo
Zcal
TypeScript
1.2k ★
2/5
Easy
Docker Compose
Manual
MIT4 months agoRepo
Nextcloud Calendar
PHP
1.2k ★
2/5
Easy
Docker
Docker Compose
+1
AGPL-3.03 days agoRepo
OpenSlots
PHP
400 ★
2/5
Easy
Manual
Docker
MIT9 months agoRepo

What to look for: For appointment-style booking you need provider and service management, working-hours and buffer rules, and reliable calendar sync and reminders. Decide whether you want a developer-extensible scheduling platform (Cal.com) or a focused service-business booking app with built-in provider/service models (Easy!Appointments).

Head-to-head:Cal.com vs Acuity SchedulingCal.diy vs Acuity SchedulingQloApps vs Acuity SchedulingRadicale vs Acuity SchedulingFider vs Acuity Scheduling

The alternatives, reviewed

  1. #1
    Cal.com
    Self-host: Moderate

    Scheduling infrastructure for everyone, the open-source Calendly alternative

    47k TypeScript AGPL-3.0 8 days ago
    How it compares to Acuity Scheduling
    • 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.
    RepoDetails & deploy →
  2. #2
    Cal.diy
    Self-host: Moderate

    Open-source online appointment scheduling built on Cal.com

    47k Nodejs MIT 8 days ago
    How it compares to Acuity Scheduling
    • Self-hosted setup requires configuring PostgreSQL, email/SMTP, and OAuth providers
    • Enterprise features (SAML SSO, workflows at scale, analytics) are cloud-only or require an enterprise license
    • Payment collection integrations need additional third-party setup
    • Admin UI for multi-tenant management is less polished than Calendly's hosted offering
    RepoDetails & deploy →
  3. #3
    QloApps
    Self-host: Involved

    Open-source hotel reservation and channel management system

    14k PHP OSL-3.0 20 days ago
    How it compares to Acuity Scheduling
    • Scope is hotel-specific; not a general-purpose appointment scheduler
    • Channel manager integrations (OTA sync) are limited compared to commercial PMS solutions
    • Mobile app for guests/staff is absent out of the box
    • PrestaShop heritage makes theming and customisation non-trivial
    RepoDetails & deploy →
  4. #4
    Radicale
    Self-host: Easy

    Lightweight CalDAV and CardDAV server with minimal configuration

    4.9k Python GPL-3.0 11 days ago
    How it compares to Acuity Scheduling
    • No web-based calendar UI; clients must use a CalDAV-compatible app (Thunderbird, Apple Calendar, etc.)
    • Not a booking/scheduling tool; no public booking pages or availability sharing like Calendly
    • Scaling beyond a handful of users is not a design goal
    • Lacks push notifications; relies on client polling
    RepoDetails & deploy →
  5. #5
    Fider
    Self-host: Moderate

    Open platform to collect, vote on, and prioritise user feedback

    4.4k Docker MIT 5 days ago
    How it compares to Acuity Scheduling
    • categorySlug is 'scheduling' but Fider is a feedback/voting tool; replaces options are limited to scheduling slugs in the ref
    • No roadmap visualisation or timeline planning built in
    • Integrations with Jira, Linear, or Slack require custom webhooks
    • No in-app surveys or NPS measurement
    RepoDetails & deploy →
  6. #6
    Easy!Appointments
    Self-host: Moderate

    Self-hosted appointment scheduler for service businesses with provider and service management

    4.3k PHP GPL-3.0 6 days ago
    How it compares to Acuity Scheduling
    • 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.
    RepoDetails & deploy →
  7. #7
    Hi.Events
    Self-host: Moderate

    Self-hosted event management and ticketing for any scale

    3.9k Docker AGPL-3.0 4 days ago
    How it compares to Acuity Scheduling
    • Payment gateway support is limited to Stripe; no PayPal or regional gateways out of the box
    • No recurring event / subscription ticketing support
    • Email marketing and attendee re-engagement tools are minimal
    • Mobile check-in app is not available; badge printing requires third-party tools
    RepoDetails & deploy →
  8. #8
    Baïkal
    Self-host: Moderate

    Lightweight CalDAV and CardDAV server based on sabre/dav

    3.2k PHP GPL-3.0 17 days ago
    How it compares to Acuity Scheduling
    • No web-based calendar or scheduling UI for end users; requires a CalDAV client app
    • No public booking page or availability-sharing feature comparable to Calendly
    • Development activity has slowed; some sabre/dav edge cases may go unpatched
    • HTTPS and reverse-proxy setup is manual and not guided
    RepoDetails & deploy →
  9. #9
    pretix
    Self-host: Moderate

    Open-source ticket sales and event registration platform for any scale

    2.5k Python Apache-2.0 3 days ago
    How it compares to Acuity Scheduling
    • Steeper setup curve than simple booking tools
    • No built-in one-on-one appointment scheduling workflow
    • Mobile app for organizers is Android/iOS only, not PWA
    RepoDetails & deploy →
  10. #10
    Indico
    Self-host: Involved

    CERN's open-source event and conference management platform

    2.1k Python MIT 4 days ago
    How it compares to Acuity Scheduling
    • Overpowered for simple one-on-one appointment booking
    • Setup involves multiple services (Redis, PostgreSQL, Celery) and is complex
    • UI design is functional but dated compared to modern booking tools
    RepoDetails & deploy →
  11. #11
    SabreDAV
    Self-host: Advanced

    Open-source CardDAV, CalDAV, and WebDAV framework for PHP

    1.7k PHP MIT 15 days ago
    How it compares to Acuity Scheduling
    • A developer framework, not an end-user product; requires significant custom PHP development
    • No admin UI, booking pages, or user-facing features out of the box
    • Documentation assumes solid PHP and WebDAV protocol knowledge
    • Not a drop-in replacement for any SaaS scheduling tool without substantial build effort
    RepoDetails & deploy →
  12. #12
    Bracket
    Self-host: Moderate

    Flexible self-hosted tournament management with live public rankings

    1.7k Docker AGPL-3.0 3 days ago
    How it compares to Acuity Scheduling
    • No built-in calendar integration or iCal/Google Calendar sync for match schedules
    • Payment collection for entry fees is absent
    • Email or SMS notifications to participants are not supported out of the box
    • Limited reporting and export options compared to dedicated event-management SaaS
    RepoDetails & deploy →
  13. #13
    Schej
    Self-host: Easy

    When2meet-style group availability finder you can self-host

    1.7k Vue MIT 29 days ago
    How it compares to Acuity Scheduling
    • No calendar integration — availability is marked manually
    • No booking confirmation or email reminders
    • Limited to group poll-style scheduling, not one-on-one booking pages
    RepoDetails & deploy →
  14. #14
    Alf.io
    Self-host: Involved

    Open-source ticket reservation platform for events of any size

    1.6k Java GPL-3.0 4 days ago
    How it compares to Acuity Scheduling
    • No built-in recurring appointment booking (1:1 scheduling like Calendly)
    • Mobile app for attendees is not provided; check-in relies on a separate web view
    • Analytics and post-event reporting are basic compared to Eventbrite or Cvent
    • Initial Java/PostgreSQL setup is heavier than typical SaaS onboarding
    RepoDetails & deploy →
  15. #15
    Zcal
    Self-host: Easy

    Beautiful open-source scheduling page and availability management tool

    1.2k TypeScript MIT 4 months ago
    How it compares to Acuity Scheduling
    • Fewer calendar integrations than Cal.com
    • No team scheduling or round-robin features
    • Limited workflow automation (no reminders or follow-ups)
    RepoDetails & deploy →
  16. #16
    Nextcloud Calendar
    Self-host: Easy

    Full-featured CalDAV calendar server built into Nextcloud with sharing and scheduling

    1.2k PHP AGPL-3.0 3 days ago
    How it compares to Acuity Scheduling
    • No native public booking-page flow (requires a third-party plugin)
    • Video conferencing integration is limited compared to Calendly
    • Mobile app experience is less polished than hosted alternatives
    RepoDetails & deploy →
  17. #17
    OpenSlots
    Self-host: Easy

    Minimalist appointment slot booking system with email confirmation

    400 PHP MIT 9 months ago
    How it compares to Acuity Scheduling
    • No recurring appointment or subscription booking support
    • Email notifications only — no SMS or push
    • No calendar sync (Google/Apple/Outlook)
    RepoDetails & deploy →

The verdict

Cal.com is the strongest overall Acuity replacement thanks to its feature depth, managed-cloud option, and active community. If you run a service business and want a lighter, purpose-built tool with native provider and service management, Easy!Appointments is the focused alternative.

Still deciding? Compare Cal.com vs Cal.diy side by side →

Acuity Scheduling alternatives — frequently asked questions

What is the best open-source Acuity Scheduling alternative?

Cal.com for breadth and Easy!Appointments for service-business booking. Cal.com (AGPL-3.0, ~36,000 stars) offers the most features and a managed cloud; Easy!Appointments (GPL-3.0) is built around providers and services.

Is there a free self-hosted alternative to Acuity?

Yes. Both Cal.com and Easy!Appointments are open source and free to self-host, removing Acuity's per-calendar monthly subscription.

Which alternative is best for a salon or clinic with multiple providers?

Easy!Appointments is designed for exactly that, with built-in provider and service management for service businesses. Cal.com also handles multi-person scheduling via teams and round-robin.

Which is easier to self-host, Cal.com or Easy!Appointments?

Both are rated 3/5 difficulty. Cal.com edges ahead because it offers a One-Click deploy in addition to Docker and manual installation.

Do I need Squarespace to use these like Acuity?

No. Both Cal.com and Easy!Appointments are standalone and self-hosted, so you avoid the Squarespace ecosystem entirely and keep your booking data on your own server.

Is there a hosted version if I don't want to manage a server?

Cal.com offers an official managed cloud (managed:yes), so you can use it without self-hosting. Easy!Appointments is self-host only.

Keep exploring

All Scheduling & Booking →Self-hosted directory →Easiest to self-host →
Calendly alternatives