SpecialistNonprofit offer

Cal.com

Open-source online booking with a generous free plan.

Visit site ↗Pricing ↗

Strong choiceOpen-source scheduling with a generous free plan.

See how Cal.com fits your setup. Add the tools you already use.

Price

Free plan · paid from US$12/user/month (Teams, billed yearly)

Nonprofit offer

Yes

Available in

🌍Anywhere

Suits

Volunteer-run · Small · Medium

Cal.com says it offers special nonprofit discounts on a nonprofit page, but publishes no percentage or process.

Contact Cal.com through its website to ask about nonprofit pricing.

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Great for

Charities booking appointments with advisers or volunteers
Teams that want a free or cheap Calendly alternative
Organisations that want open-source software
Free plan with unlimited bookings
Open source and self-hostable
Team scheduling available

Watch out for

Organisations needing a full multi-user free plan
Teams that want a detailed published nonprofit discount
Free plan is for a single user
Nonprofit discount terms are not published
Some features need paid plans

Problems it solves

“I spend ages emailing about appointment times”“Clients keep missing sessions and I need reminders”“We need advisers to share bookings fairly between them”“I want a free alternative to Calendly”“I need people to book a call with our team online”

About Cal.com+

Cal.com lets people book meetings or appointments with you by choosing a free time on your calendar, so you avoid emailing back and forth. It has a free plan for one user and paid team plans, and the software is open source. It is an alternative to Calendly for charities that want round-robin booking for several advisers.

Pricing: Free: 1 user, unlimited event types and calendars, email and SMS notifications, 100+ integrations. Teams US$12 per user per month billed yearly; Organizations US$28; Enterprise custom. 14-day trial on paid plans.

Key features+

Booking pagesCalendar syncRound-robin team schedulingPayments via Stripe and PayPalEmail and SMS remindersOpen source

Works with (5)+

Google Workspace for NonprofitsMicrosoft Outlook

Zoom

Stripe

Zapier

Data & privacy+

Not reviewed. Cal.com can be self-hosted because it is open source.

How sure are we?+

Partly confirmed on the vendor's pages; some details from reputable secondary sources. Prices and nonprofit programs change often, so check with Cal.com before you commit. Rankings on Nonprofit Tools are never for sale.

Sources · last checked 2026-10-02