A widget that gives visitors a reason to book
The floating widget rotates short messages you write, so visitors see why to book before they click.
CalStack vs Cal.com
Cal.com is a broad scheduling platform. CalStack qualifies leads first and preps every call in Google Meet.
| CalStack | Cal.com |
|---|---|
| Best for | |
| Teams that book qualified calls from their website and run them in Google Meet. | Teams that want a broad scheduling platform with a generous free plan. |
| Team price | |
| $47 a month billed yearly, up to 15 seats | $12 a user a month billed yearly |
| Stands out for | |
| Questions before the calendar, AI call prep, a Meet side panel | Payments, SMS and CRM sync on the free plan, SSO and compliance |
The short answer
CalStack and Cal.com both book meetings from a link or a widget on your website. Cal.com is a broad scheduling platform with a generous free plan, every major calendar and video tool, and enterprise controls such as SSO. CalStack is narrower: it asks your qualifying questions on every plan, preps each call with AI inside Google Meet, and costs one flat price for up to 15 seats.
Choose CalStack if
- Leads should answer your questions before they see your calendar, on every plan.
- Your team runs its calls in Google Meet and wants prep and notes beside the call.
- You'd rather pay one price for up to 15 seats than pay for every user.
- You want to see where booking page visitors come from, not only who booked.
Choose Cal.com if
- Your team uses Outlook, Apple or Zoho calendars, or Zoom and Teams links.
- You want payments, SMS reminders or a CRM sync on a free plan.
- You need SAML SSO, SCIM or HIPAA compliance.
- You want to bring your Calendly event types over in one click.
Feature comparison
| Feature | CalStack | Cal.com |
|---|---|---|
| Booking and qualifying | ||
| Booking page with its own link | Yes | Yes |
| Floating booking widget on your website | YesWith rotating callouts | YesFloating button |
| Booking calendar embedded inside a page | No | Yes |
| Qualifying questions before the calendarLeads answer your questions first, then pick a time. | Yes | PaidTeams, with routing forms |
| Send leads to the right place based on their answersTo a host or team, a message, or another page. | PaidTeam plan | PaidTeams plan; by attributes on Organizations |
| Team scheduling | ||
| Each host books on their own calendar | Yes | Yes |
| Round-robin across a teamSpread meetings evenly, or fill the most open slots. | PaidTeam plan | PaidTeams plan, with weights |
| Meetings that need several hosts free at once | PaidTeam plan | PaidTeams plan |
| Calendars and video | ||
| Google Calendar | Yes | Yes |
| Outlook and Microsoft 365 calendars | No | YesAlso Apple and Zoho |
| Google Meet links on every booking | Yes | Yes |
| Zoom and Microsoft Teams | No | YesAlso Cal Video |
| Automations and integrations | ||
| Reminder emails or texts before the call | No | YesEmail and SMS |
| Built-in CRM sync | NoThrough Zapier, n8n or webhooks | YesHubSpot and Salesforce, two-way |
| Take payment when a call is booked | No | YesStripe and PayPal |
| Analytics | ||
| Booking and team analytics | Yes | PaidTeams plan |
| Plans | ||
| Free plan | Yes3 booking pages, 1 seat | Yes1 user, unlimited event types |
| How seats are priced | Flat: up to 15 seats on Team | Per user |
| Remove the vendor's branding | PaidTeam plan | PaidTeams plan |
| Booking page in other languages | NoEnglish only | YesMultiple languages |
Is CalStack cheaper than Cal.com?
CalStack charges one price per workspace with the seats included. Cal.com charges for each user. Pick a team size to compare list prices on the plans with round-robin and routing.
Seats
CalStack
$47a month
Team plan, flat, up to 15 seats
Cal.com
$120a month
$12 × 10 seats, Teams, billed yearly
List prices in US dollars from each vendor’s pricing page, checked October 2026. Both have a free plan for one person. Cal.com's monthly price is worked out from the yearly discount shown on its pricing page.
Where CalStack is different
Questions come before the calendar
Every booking page starts with your qualifying questions, on the Free plan too. CalStack can draft them from a short description of who you want to meet.
Prep and notes inside Google Meet
A side panel in Google Meet shows the lead's answers and your AI talking points. Tag the outcome and take notes without leaving the call.
One price for the whole team
The Team plan covers up to 15 seats for one monthly price, so adding a teammate doesn't change the bill.
When to choose Cal.com instead
- More on the free plan. Cal.com's free plan includes unlimited event types and calendars, email and SMS notifications, Stripe and PayPal payments, and a two-way HubSpot and Salesforce sync.
- Any calendar and video tool. Cal.com connects Google, Outlook, Apple and Zoho calendars, and adds Google Meet, Zoom, Microsoft Teams or Cal Video links. CalStack works with Google Calendar and Google Meet only.
- Enterprise controls. The Organizations plan adds SAML SSO, SCIM, a company subdomain, and SOC 2, HIPAA and ISO 27001 compliance.
- A one-click Calendly import. Cal.com imports your Calendly event types. CalStack has no importer, so you set each booking page up again.
- Booking pages in other languages. Cal.com offers booking pages and event details in several languages. CalStack's booking pages are in English.
Switching from Cal.com
Connect Google Calendar
Each host connects their own Google Calendar. CalStack checks it for conflicts and adds a Meet link to every booking.
Move your routing form
Add your Cal.com routing form questions to a booking page, then set where each answer sends the lead.
Add the widget
Paste one script tag to show the floating widget, and use the booking page link wherever you shared your Cal.com link.
Questions and answers
- Is CalStack a good Cal.com alternative?
- Yes, if your team runs its calls in Google Meet and wants to qualify leads before they book. If you need Outlook, Zoom, payments or SSO, Cal.com covers more ground today.
- Is CalStack cheaper than Cal.com?
- For teams of four or more, yes. CalStack's Team plan is $47 a month billed yearly for up to 15 seats. Cal.com's Teams plan is $12 a user a month billed yearly, so 10 users cost $120 a month. For one to three people, Cal.com costs less, and both have a free plan.
- Is Cal.com still open source?
- Not its main product. Cal.com moved its codebase to a private repository in April 2026 and released a separate version, Cal.diy, under the MIT license. CalStack is a hosted product and is not open source either.
- Do I need a paid plan to ask qualifying questions?
- No. Questions before the calendar are on every CalStack plan, Free included. Sending leads to different hosts based on their answers needs the Team plan. On Cal.com, routing forms need the Teams plan.
- Does CalStack work with Outlook or Zoom?
- Not yet. CalStack works with Google Calendar and Google Meet only. Cal.com supports Outlook, Apple and Zoho calendars, and Zoom, Microsoft Teams and Cal Video links.
- Can I import my Cal.com event types?
- There is no importer. You set up each booking page again in CalStack: pick the hosts, the meeting length and the hours, then add your questions.
How we compared
CalStack’s column comes from the product as it works today. Every Cal.com fact comes from Cal.com’s own site, checked October 2026. Prices are list prices in US dollars and change over time. If something here is out of date, tell us.
- Cal.com pricing
- Round robin scheduling
- Routing with attributes
- Adding an embed
- Cal.com goes closed source
Cal.com is a trademark of its owner. CalStack is not affiliated with Cal.com.
More comparisons
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CalStack vs Chili Piper
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CalStack vs HubSpot Meetings
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CalStack vs SavvyCal
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CalStack vs Acuity Scheduling
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CalStack vs RevenueHero
B2B teams that route leads from their existing forms using CRM data, and pay only for reps who get meetings.
All comparisons
Every tool we compare CalStack with, side by side.
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