Appointments for Nextcloud vs Cal.diy
Both are alternatives to Calendly. Here's how they stack up — verified facts, no spin.
Also searched as Cal.diy vs Appointments for Nextcloud — same comparison, one verdict.
Appointments for Nextcloud and Cal.diy are closely matched on ownership (88 vs 85) — this one comes down to pricing and to which trade-offs below you can live with.
Appointments for Nextcloud
Calendly-style booking pages built into your existing Nextcloud.
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.
Cal.diy
MIT-licensed community edition of the Cal.com scheduling codebase.
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.
Side by side
10 points of comparison, every one read from a verified field. Green marks the side that wins a row outright. A dash means we do not hold that fact — never that it is zero.
| Appointments for Nextcloud | Cal.diy | |
|---|---|---|
| Sovereignty ScoreOur transparent 0–100 composite for data ownership and exit cost. | 88 | 85 |
| Open source | Yes | Yes |
| Self-hostable | Yes | Yes |
| Local-first data | Yes | Yes |
| License | AGPL-3.0 | MIT |
| Pricing | Free; installed from the Nextcloud App Store into an existing Nextcloud instance. Optional donations support the solo maintainer. | Free, self-hosted. No official managed hosting or support channel; Cal.com's paid hosted product is a separate, now closed-source, offering. |
| RAM to run it wellThe figure that actually matters, not the vendor's minimum. | Whatever your Nextcloud already uses, since the app adds no services. A Nextcloud stood up just for booking still means running all of Nextcloud; 4 GB is comfortable | 2 GB to run the built image with PostgreSQL and Redis; 8 GB on whichever machine does the build |
| Realistic running costWhat the box costs each month if you run it yourself. | $0 on a Nextcloud you already run; otherwise the cost of Nextcloud itself, $12–24/mo on a 4 GB VPS | $6–12/mo on a 2 GB VPS, as long as you build the image on an 8 GB machine you already own and push it to a registry |
| Setup timeHonest first-install estimate, not the marketing quickstart. | 15 minutes from the Nextcloud app store, plus an hour to build your schedule | Half a day for the first build and deploy, and every upgrade or domain change means another rebuild |
| Ongoing maintenanceThe part nobody budgets for. | Check the app's supported Nextcloud versions before every major Nextcloud upgrade, because it's one developer's app and can trail Nextcloud's releases. Otherwise it updates through the app store like any other app. | There are no tagged cal.diy releases since the April 2026 fork, so upgrading means pulling main, rebuilding and running database migrations. Some features need cron jobs you set up yourself, and each integration (Google, Microsoft, Zoom) needs developer credentials you create. |
Appointments for Nextcloud edges it on the Sovereignty Score, but the right pick depends on the trade-offs below.
Weighing both against staying on Calendly? Is Calendly free? What it actually costs →
Appointments for Nextcloud
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
Cal.diy
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
Which one fits you
The trade-offs above, turned into a decision. Find the line that describes your team.
Choose Appointments for Nextcloud
if a lower exit cost matters more to you than any single feature, and actively maintained (updated within the last two weeks) with very positive community ratings on the Nextcloud App Store.
Choose Cal.diy
if fully MIT-licensed — no open-core split, no feature paywall, free to modify or redistribute.
Neither, yet
if both carry a real cost you should weigh first — only useful if you're already running (or willing to run) Nextcloud — it's not a standalone product, and its own docs recommend it for personal use only and disclaim production readiness — 'use at your own risk'. If either of those is a dealbreaker for your team, the shortlist is wrong rather than the choice.
What it takes to run these yourself
Real requirements and honest running costs, not the vendor quickstart.
Self-hosting Appointments for Nextcloud
Whatever your Nextcloud already uses, since the app adds no services. A Nextcloud stood up just for booking still means running all of Nextcloud; 4 GB is comfortable RAM · 15 minutes from the Nextcloud app store, plus an hour to build your schedule
$0 on a Nextcloud you already run; otherwise the cost of Nextcloud itself, $12–24/mo on a 4 GB VPS
Self-hosting Cal.diy
2 GB to run the built image with PostgreSQL and Redis; 8 GB on whichever machine does the build RAM · Half a day for the first build and deploy, and every upgrade or domain change means another rebuild
$6–12/mo on a 2 GB VPS, as long as you build the image on an 8 GB machine you already own and push it to a registry
Appointments for Nextcloud vs Cal.diy — common questions
Is Appointments for Nextcloud a better fit than Cal.diy for scheduling & booking?
It depends on what you are optimising for, and the honest split is this: Appointments for Nextcloud scores 88 to Cal.diy's 85 on data ownership and exit cost, so it is the safer choice if you care about being able to leave. Cal.diy earns its place on a different axis — fully MIT-licensed — no open-core split, no feature paywall, free to modify or redistribute. Neither is a wrong answer for every team; the table above is the actual comparison.
What happens if we want to switch later?
Appointments for Nextcloud keeps its data local or in open formats, so leaving is an export rather than a negotiation. Cal.diy is still self-hostable, so the files stay on your server either way — but it is not local-first by design, so check what its export produces before you rely on it.
Can I self-host Appointments for Nextcloud or Cal.diy?
Both can be self-hosted. The difference is what it costs you in time rather than whether it is possible — see the setup and maintenance rows above.
Are Appointments for Nextcloud and Cal.diy both alternatives to Calendly?
Yes — both appear in our Calendly comparison, which is why they are worth putting side by side. People usually arrive here already having decided to move off Calendly and now choosing between the two replacements, which is a narrower and much easier question.
Related alternative guides
Facts verified 2026-07-09. Licenses and pricing change — spotted something out of date? That's a correction we want.