The short version
Calendly is the best-known scheduling tool, used by more than 20 million professionals, with a free plan, round-robin, routing forms and payments in the booking flow. It prices per seat and connects to a separate CRM. mDOS includes meeting booking links, and puts them next to a sales pipeline, cold email and LinkedIn outreach, email marketing, your website and quotes with e-sign, at one price per site with no per-user fees. An AI team (Beta) follows up meetings around the clock once you switch it on, and our marketing team is on live chat on every plan.
How our software compares
This compares our software’s features only. Our AI agents and our partner Marketing Experts come on top, and no single tool here includes them. Every mDOS line is live today unless it says Beta. Every Calendly line comes from Calendly’s own website; “Not listed” means we couldn’t find it there. Checked on 9 Oct 2026; sources are listed below.
And on top of the software: AI agents that do the legwork, and vetted Marketing Experts running it with you. No single tool compared here includes them.
Where mDOS is stronger
- Fixed pricing: one price per site with every feature included, where Calendly charges per seat.
- A sales pipeline from enquiry to signed, where Calendly’s Contacts is for meeting context and points you to a separate CRM.
- Everything that books the meeting: email and text campaigns, cold email, LinkedIn outreach and your website, plus quotes and e-sign after it.
- A real marketing team on live chat on every plan, and on the Managed plan they run your marketing for you.
- Vetted Marketing Experts on the Managed plan: a Certified Partner Agency (such as Founding Partner Mr Digital) runs your marketing for you, under a retainer contracted and invoiced by that partner.
Where Calendly is stronger
- The most widely used scheduling tool, with 20 million professionals by its own count.
- Routing forms and round-robin built for sharing meetings across sales and service teams.
- A free plan, and payments taken in the booking flow.
Sources (12) · checked 9 Oct 2026
- Free plan (one event type); Standard $10 and Teams $16 a seat a month; Enterprise from $15k a year with at least 50 seats; Notetaker and Callie are add-ons · calendly.com
- Free plan with one event type, one calendar and one-on-one scheduling · calendly.com
- Scheduling links, event types, round-robin scheduling, routing forms and meeting polls · calendly.com
- "Contacts" tracks emails, bookings, meetings and form inputs, for "relationship management and meeting context rather than sales pipeline management"; Salesforce, HubSpot and Dynamics connect instead · calendly.com
- Contacts can bulk email existing contacts with templates and AI-assisted drafts · calendly.com
- Automated text reminders to reduce no-shows · calendly.com
- "Payments": upfront meeting charges, package sales and invoices through Stripe or PayPal in the booking flow · calendly.com
- Routing forms qualify leads before they book · calendly.com
- Callie, an AI scheduling assistant working from your inbox, and Notetaker for meeting recaps and follow-ups · calendly.com
- "150+ integrations", plus Zapier bridges to 6,000+ apps · calendly.com
- "20 million professionals" use it, "the world’s #1 scheduling tool" · calendly.com
- Enterprise includes dedicated support and onboarding help · calendly.com
Moving from Calendly at your own pace
You don’t have to move everything at once. Set up your booking links in mDOS, keep Calendly links live while people still use them, and new meetings land on your customer records. We agree a switching plan with you.
More than a meeting booking tool
Unlike Calendly, mDOS isn’t only a meeting booking tool. You get The Platform, The AI Agents and The Marketing Experts, working as one, at one price per site.
World-leading software
Not just a meeting booking tool: your website, bookings, customer records, marketing and team tools in one system.
Tireless AI agents
AI agents draft campaigns, review replies and follow-ups for you to approve, and spot problems early. Nothing goes out without your approval.
Real experts driving it
Vetted Marketing Experts, led by our Founding Partner Agency Mr Digital, set the plan and steer the AI. On Managed, we run your marketing and answer for the results.