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Migration guide · Scheduling & Booking

The 4 best free & open-source Calendly alternatives

Calendly is a hosted scheduling platform that lets people share a booking link, define their availability, and let others pick a free time slot without back-and-forth emails. It syncs with Google, Outlook, and Office 365 calendars, supports team round-robin and collective booking, and integrates with video-conferencing, payment, and CRM tools.

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Bottom line

Easy!Appointments is our top pick — Mature, self-hosted appointment booking with Google Calendar sync. We compare all 4 options below, with honest trade-offs.

Jump to the full comparison →

The cost

Free tier covers one event type and basic scheduling. Paid plans run Standard $10/seat/mo, Teams $16/seat/mo, and Enterprise custom pricing (billed annually); most integrations, workflows, and team routing sit behind paid tiers.

Why people consider an alternative

People look for an alternative to Calendly when they want to stop paying a per-seat subscription for features (routing, workflows, multiple event types) that self-hosted tools include for free, when they want their bookers' personal data to stay on infrastructure they control rather than a US-hosted SaaS, or when they simply want one flat scheduling page without ongoing billing.

The verdict — at a glance

AlternativeLicenseSelf-hostPricingSovereignty
Easy!Appointments★GPL-3.0YesFree, self-hosted (own server/hosting cost only). Optional paid add-ons: SMS reminders, payment processing, custom development, and managed hosting from the maintainer.91
Appointments for NextcloudAGPL-3.0YesFree; installed from the Nextcloud App Store into an existing Nextcloud instance. Optional donations support the solo maintainer.88
Cal.diyMITYesFree, self-hosted. No official managed hosting or support channel; Cal.com's paid hosted product is a separate, now closed-source, offering.85
RalllyAGPL-3.0YesFree, self-hosted via Docker. A hosted version exists at rallly.co with an optional paid Pro tier for extra features.84
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Macrostack's top pick

Easy!Appointments

Mature, self-hosted appointment booking with Google Calendar sync.

Every alternative, compared

#1★ TOP PICK

Easy!Appointments

Mature, self-hosted appointment booking with Google Calendar sync.

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OPEN SOURCEGPL-3.0SELF-HOSTLOCAL-FIRST

Easy!Appointments is a PHP/MySQL scheduling app that's been in active development for roughly a decade. It gives staff/service businesses a public booking page with configurable providers, services, working hours, and Google Calendar two-way sync. It's a closer match to Calendly's single-provider booking-page model than group-polling tools, and it's popular with clinics, salons, and consultants who want a no-subscription booking page.

Strengths

  • +Long track record (in development since 2015) with a large, active community (4,200+ GitHub stars, commits within the last week)
  • +Straightforward LAMP-stack deployment most hosts already support, no exotic infra
  • +Google Calendar two-way sync and multi-language support out of the box
  • +No enterprise paywall — team/multi-provider features are in the free core

Trade-offs

  • −UI is functional rather than polished compared to Calendly's consumer-grade design
  • −No native video-conferencing integration (Zoom/Meet) — you wire that up separately
  • −SMS reminders and payment processing require paid add-ons or your own integration work
  • −You own patching, backups, and uptime — there's no managed cloud fallback if self-hosting isn't for you
Free, self-hosted (own server/hosting cost only). Optional paid add-ons: SMS reminders, payment processing, custom development, and managed hosting from the maintainer.
WebsiteSourceDocs
#2

Appointments for Nextcloud

Calendly-style booking pages built into your existing Nextcloud.

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OPEN SOURCEAGPL-3.0SELF-HOSTLOCAL-FIRST

Appointments is a Nextcloud app that adds Calendly-style public booking pages on top of a Nextcloud instance's own calendar (CalDAV-compatible, so it also works with iOS, Android, and Google Calendar via sync). It's the natural fit for anyone already self-hosting Nextcloud who wants booking pages without adding a second standalone app to operate.

Strengths

  • +Actively maintained (updated within the last two weeks) with very positive community ratings on the Nextcloud App Store
  • +No new infrastructure if you already run Nextcloud — one more app, not a second server to maintain
  • +Standard CalDAV underpinnings mean no lock-in to a proprietary calendar format
  • +Supports GDPR-relevant features like embeddable request forms and up to 10 booking pages per user

Trade-offs

  • −Only useful if you're already running (or willing to run) Nextcloud — it's not a standalone product
  • −Maintained largely by one developer; bus-factor risk is higher than a larger team project
  • −No built-in payment collection, unlike Calendly's paid tiers or Easy!Appointments' add-ons
  • −Nextcloud itself can be heavier to operate than a single-purpose scheduling app
Free; installed from the Nextcloud App Store into an existing Nextcloud instance. Optional donations support the solo maintainer.
WebsiteSourceDocs
#3

Cal.diy

MIT-licensed community edition of the Cal.com scheduling codebase.

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OPEN SOURCEMITSELF-HOSTLOCAL-FIRST

Cal.diy is the free, permissively-licensed fork Cal.com released in April 2026 after taking its commercial product closed-source. It carries over Cal.com's core booking engine — event types, buffer/booking-limit rules, Stripe/PayPal payments, and calendar/video integrations — under the MIT license, but the maintainers themselves describe it as community-maintained and recommend it for personal, non-production use rather than as a supported business tool.

Strengths

  • +Fully MIT-licensed — no open-core split, no feature paywall, free to modify or redistribute
  • +Inherits a feature-rich booking engine: recurring events, seated events, payments, wide calendar/video integration list
  • +REST API and embeddable booking widgets for building your own booking flow
  • +Active repo (46k+ stars, commits within days) even post-fork

Trade-offs

  • −Its own docs recommend it for personal use only and disclaim production readiness — 'use at your own risk'
  • −No official support; the parent company no longer backs this codebase
  • −Missing team/organization features, SSO/SAML, workflows, and routing forms that stayed in Cal.com's closed-source enterprise edition
  • −Requires running Postgres + Redis + a Node.js host yourself — more moving parts than a single-binary app
  • −Young as an independent project (forked April 2026); long-term maintenance commitment is unproven
Free, self-hosted. No official managed hosting or support channel; Cal.com's paid hosted product is a separate, now closed-source, offering.
WebsiteSourceDocs
#4

Rallly

Open-source group scheduling and meeting-time polling.

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OPEN SOURCEAGPL-3.0SELF-HOSTLOCAL-FIRST

Rallly solves a different but related problem: instead of one person publishing a booking link, it lets a group vote on the best time for a meeting across several proposed slots — the open-source answer to Doodle that also covers a chunk of Calendly's group-scheduling use case. It's actively developed and offers a hosted version (rallly.co) alongside a documented self-hosted Docker deployment.

Strengths

  • +Simple, focused tool that's genuinely good at the group-availability-poll problem
  • +Active project (5,100+ stars, commits within the last day) with a documented Docker Compose deployment
  • +AGPL-3.0 keeps improvements to a hosted fork open

Trade-offs

  • −Not a 1:1 booking-page replacement — no per-provider service catalog, payments, or staff management like Calendly/Easy!Appointments
  • −Primary distribution is the hosted rallly.co app; self-hosting is supported but secondary in the project's own messaging
  • −AGPL-3.0 requires you to publish modifications if you offer a modified version as a network service
Free, self-hosted via Docker. A hosted version exists at rallly.co with an optional paid Pro tier for extra features.
WebsiteSourceDocs

Questions people ask

▸ Is Cal.com itself still open source?

No. In April 2026, Cal.com, Inc. moved its commercial product's codebase to a private repository and cited AI-assisted vulnerability scanning as the reason. The public repository was renamed to Cal.diy and relicensed under MIT as a free community edition, explicitly recommended for personal, non-production use rather than as a supported replacement for Cal.com's commercial product.

▸ Which alternative is closest to a drop-in Calendly replacement?

Easy!Appointments is the closest match for a single-provider public booking page with calendar sync, and it's the one we recommend for most readers switching off Calendly. Rallly instead matches Calendly's group-scheduling/polling angle (closer to Doodle). If you already run Nextcloud, the Appointments app avoids standing up a second service.

Compare them head-to-head

Easy!Appointments vs Appointments for Nextcloud→Easy!Appointments vs Cal.diy→Easy!Appointments vs Rallly→Appointments for Nextcloud vs Cal.diy→Appointments for Nextcloud vs Rallly→Cal.diy vs Rallly→

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Entry last verified 2026-07-09. Licenses and pricing change — spotted something out of date? That's a correction we want.

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