Choose Cal.com if
You are one person, or you want to self-host, or you are a developer who would rather configure than be given five settings. The free tier is excellent and the honest recommendation for solo use.
CENTILIO BOOK / SELL · EMBER
Looking for a Cal.com alternative? Its free tier is the best single-user deal here.
Cal.com is free for one user with unlimited event types and calendars, Stripe and PayPal payments and a hundred integrations, then $12 per user a month billed yearly for Teams and $28 for Organizations. It is open source and the free tier is the most generous single-user offer in this comparison. The meter is the user, so eight people is $96 a month. Book is $19 for the business.
list prices · 7 September 2026corrections welcomenot shipped, and it says so
Product design preview · Book has not shipped. All plans, integrations and screens are proposals.
Book has not shipped yet.
Book is not available yet. These are proposed screens, features and prices—not a beta or a live booking service. The interactive diary uses fictional data; no appointment, message, deposit or customer record leaves this page.
Side by side
Centilio Book and Cal.com, honestly.
List prices as published on the vendor's public pages on 7 September 2026. Check their page for today's figure and tell us if we are out of date.
Historical comparison imported from Fable’s 7 September 2026 research. Vendor plans and billing periods differ; these figures are not a current quote. Confirm the provider’s pricing before deciding.
| Centilio Book | Cal.com | |
|---|---|---|
| Price | Free, then $19 a month for the whole business | Free (1 user); Teams $12 per user; Organizations $28 per user (yearly) |
| One person | Free | Free — and better than ours at this size |
| Eight people | $19 | $96 on Teams |
| Self-hosting | No | Yes, and it is properly open source |
| Rooms, chairs and equipment | On Business | Not the model |
| Reminder ladder with SMS | On Pro | Workflows, on paid plans |
| The booking becomes a customer record | In Relate, on every plan | Salesforce and HubSpot sync |
| Available today | No. Not built | Yes |
If you switch, later
What moving from Cal.com will take.
Choose Centilio Book if
You are a clinic, salon or studio rather than a team of individuals — several people sharing one diary, rooms to allocate, deposits to hold and a front desk to run.
- Export the future appointments first. They are the only irreplaceable thing in a booking tool. Get them out of Cal.com before the subscription lapses, with the customer's name, email and phone on each one.
- Rebuild the services before the diary. Durations, buffers, who can do what and which need a deposit. Get those right and the appointments import cleanly.
- Run both for a fortnight , with the old booking link redirecting to the new page, so nothing is taken in a diary you have stopped looking at.
- Disconnect the calendars deliberately. Revoke the old tool's calendar access on each account rather than only cancelling the plan, or it keeps writing to a diary nobody is watching.
Questions
About switching.
Are these comparisons fair?
They are meant to be. Every price was read from the vendor's own pricing page on 7 September 2026 and each page says plainly when the other tool is the better buy — which for a single user is most of them.
Which is the closest competitor?
Zoho Bookings, on logic: another suite, another "it is already next to your CRM" argument. It is priced per user and it works today; Book is priced per business and does not exist yet.
Which one would you use today?
Cal.com if you are one person, Setmore if you are up to four, Acuity if you want one polished thing and do not mind the calendar bands, Square if you are a salon that already takes card payments on Square.
Next for you
What people add after Book.
What the booking touches on its way through: the record, the deposit, the reminder and the room.
The proposed shared record connects these products as they launch. Follow each product page for its current stage.
Be told when Book opens.
Wave 2 is the next build after the live tools. Leave your name and you will hear before the announcement — and tell us what your no-show rate is today, because that is the number we intend to move.