How Much Does It Cost to Build an App Like Calendly?
A booking link looks simple until it has to read several calendar systems and never double-book anyone. Here is what an MVP of an app like Calendly needs, what each part costs on our published price list, and what it costs to run.
Test version: $5,750, built in 30 days or less: booking pages synced to Google Calendar. Lean MVP: $8,750, about 40 days: adds Microsoft Outlook calendars, Zoom links, reminder emails and paid plans. Version 1 with teams: $10,250, 40 to 45 days: adds team accounts and routing of bookings between hosts.
These are fixed prices from our published price list. For the lean scope, a typical agency quote runs $65,000 to $180,000 or more by our estimate (how we estimate it: MVP development cost guide). In our worked example, third-party running costs for 300 paying hosts come to about $304 a month, most of it payment fees.
Every price below comes from our fixed price list, and every outside figure is in the sources. If you only need a booking link for your own business, read when we are not the right choice first: buying beats building there. Other products are in our app cost breakdowns.
What an MVP of an App Like Calendly Actually Needs
The core loop: a host connects a calendar and shares a link. A guest opens it, sees only the times the host is free, picks one and books. The event lands in both calendars with a video link, and both sides get a reminder. Everything in version one exists to make that loop reliable.
- Calendar connection. The host grants permission through Google's or Microsoft's "allow access" screen (OAuth) to read busy times and add events. You never hold anyone's password.
- Availability rules. Working hours, buffers between meetings, minimum notice, a daily cap and the host's time zone. Most of the logic in a scheduling app lives here.
- Meeting types and a booking page. One public link per meeting type, such as a 15-minute intro or a 45-minute demo, showing open slots in the guest's own time zone.
- Booking that cannot double-book. The app checks the calendar again at the moment of booking, holds the slot, writes the event and invites the guest.
- Video link and reminders. A meeting link on every booking, plus confirmation and reminder emails with reschedule and cancel links.
- Paid plans. A free plan and a paid plan for hosts, with a trial, so you learn early whether anyone pays.
What the real Calendly has that version one does not need
Going by Calendly's own pricing page:
- Round-robin scheduling and routing forms. Calendly keeps these for its Teams plan, for sales teams sharing inbound leads. Version one serves individual hosts; our third version adds simple routing.
- CRM integrations. Calendly lists HubSpot on Standard and Salesforce on Teams. Add a CRM when buyers ask for one, as one more integration.
- Several calendars per person. Calendly's paid plans connect up to six calendars per user, its free plan one. Checking one calendar per host covers most early users.
- Enterprise controls. Calendly includes SSO and SAML (signing in through a company's identity system) on Enterprise and sells SSO as an add-on on Teams. You need them when IT departments buy, not before.
How Calendly Started
Calendly was founded in 2013 and grew out of Tope Awotona's frustration trying to schedule demo calls with clients, according to Fortune. He put his own savings into it and hired a firm in Kiev to build the software.
The first version was narrow. Fortune describes the core as showing only a user's available time slots, and reports that the base version was free partly because, at the start, Awotona did not have the money to build payments into it. When Fortune profiled the company in November 2020, Calendly had raised just $550,000, from investors such as Atlanta Ventures, and had primarily bootstrapped itself to profitability. The first version had one job: make finding a time stop being painful.
Price Breakdown: Three Versions, Line by Line
Every line is a fixed price from our published price list; build days are working days. The calculator shows a range and a calendar timeline, because details such as screen count only come out on a call, and the call turns the range into one fixed quote.
1. Test version synced to Google Calendar: $5,750, 30 days or less
| Item | What it covers | Price | Build days |
|---|---|---|---|
| Base MVP | Sign-up and login, availability rules, one booking page per host, the booking flow, database, Stripe checkout or a waitlist, basic admin view, landing page, deployment, 30 days of support | $5,000 | 20 |
| Google Calendar integration | Connect a Google account, read busy times and write each booking into the host's calendar | +$750 | 1 |
| Total | $5,750 | 21 |
Calculator estimate: $6,000, 30 days or less. Open this build in the calculator
What you do by hand in this version. Hosts paste their own fixed video link into each meeting type, and the calendar invite doubles as the reminder. Early hosts pay through a one-off Stripe checkout or an invoice. You set up each host's availability with them on a short call, which shows you which rules people really use. This is the concierge approach: do by hand what the software will do later. The question at this stage is whether hosts send your link instead of trading emails, and Google Calendar alone can answer it.
2. Lean web MVP: $8,750, about 40 days
| Item | What it covers | Price | Build days |
|---|---|---|---|
| Base MVP | As in the test version: sign-up, availability rules, booking pages, database, admin view, landing page, deployment, 30 days of support | $5,000 | 20 |
| Subscription billing | Free and paid host plans, a trial, upgrades and a billing portal | +$1,000 | 2 |
| Email automation | Confirmation, reminder and follow-up emails, with reschedule and cancel links | +$500 | 1 |
| Google Calendar integration | Read busy times and write events in Google calendars | +$750 | 1 |
| Microsoft Outlook calendar integration | The same for Microsoft 365 and Outlook calendars, through Microsoft's calendar API | +$750 | 1 |
| Zoom integration | A new Zoom meeting link created for every booking | +$750 | 1 |
| Total | $8,750 | 26 |
Calculator estimate: $9,000 to $10,000, about 40 days. Open this build in the calculator
This is the version most founders should launch. Hosts on Google or Microsoft calendars can both sign up, and every booking gets its own Zoom link, which removes the most common question before a call: where is the meeting?
3. Version 1 with teams and routing: $10,250, 40 to 45 days
| Item | What it covers | Price | Build days |
|---|---|---|---|
| Everything in the lean MVP | Version 2 above | $8,750 | 26 |
| Teams and roles | Company accounts, invites, admin and member permissions, and team booking pages that pass each booking to the next available member | +$1,500 | 2 |
| Total | $10,250 | 28 |
Calculator estimate: $10,500 to $12,000, 40 to 45 days. Open this build in the calculator
Add this when you sell to teams rather than individuals.
Our Schedullr build schedules LinkedIn posts from Notion, not meetings, but it shares a scheduling app's main risk: the path that matters runs through other companies' APIs (Notion's and LinkedIn's), so it has to work before anything else is worth building. It started as an MVP and continued as ongoing SaaS engineering.
Running Costs After Launch
Once live, a scheduling app has a small fixed bill and one cost that grows with revenue: payment fees. Our assumptions: 300 paying hosts on a $12 monthly plan, 60 bookings per host a month (18,000 bookings), and 4 emails per booking (a confirmation and a reminder each for guest and host), so 72,000 emails a month. Prices checked November 2026.
| Item | Price | Monthly cost |
|---|---|---|
| Hosting (Vercel Pro) | $20 a month per developer seat | $20 |
| Database and sign-in (Supabase Pro) | From $25 a month | $25 |
| Email (Resend Pro) | $20 for 50,000 emails, then $0.90 per 1,000 | $20 + 22 × $0.90 = $39.80 |
| Google Calendar API | No additional cost for standard use, within quotas | $0 |
| Stripe card fees | 2.9% + 30¢ per charge: 300 × ($0.348 + $0.30) | $194.40 |
| Stripe Billing | 0.7% of billing volume: $3,600 × 0.7% | $25.20 |
| Total | $304.40 |
Revenue in this example: 300 × $12 = $3,600 a month. We did not check Microsoft's or Zoom's API terms, so check those before you budget.
That is $304.40 a month against $3,600 of revenue, and $219.60 of it is payment fees. Vercel's free Hobby plan is for personal, non-commercial use, so budget for Pro from launch. And Google says charges above its Calendar API quota limits are planned for later in 2026, so store free and busy times rather than asking Google on every page view.
Timeline: The Lean MVP Week by Week
The lean MVP is 26 build days, which the calculator shows as about 40 days:
- Week 1: scope, availability rules and booking screens agreed in writing, and a skeleton app deployed. The Google and Microsoft apps are registered in your company's name, and Google's verification is submitted, because it can take up to 10 days.
- Week 2: the availability engine, booking pages in the guest's time zone, and reading and writing Google Calendar.
- Week 3: Microsoft Outlook calendars, conflict checks across both providers, reschedule and cancel.
- Week 4: Zoom links, confirmation and reminder emails, paid plans with a trial.
- Week 5: testing across time zones and a daylight saving changeover, the admin view and the landing page.
- Week 6: production launch, handover of the full source code and documentation, and the start of 30 days of support.
The general shape of a build is in our 30-day MVP timeline; integrations and billing add the extra days here.
What Makes a Scheduling App Hard
- Time zones and daylight saving. Europe and the US change their clocks on different weekends, so for a few weeks a year a London host and a New York guest find their usual overlap has moved by an hour. Store every time in UTC (the global reference time), convert only when you display it, and test the changeover weeks on purpose.
- Double-booking and stale availability. A calendar can change between the moment a page loads and the moment someone clicks a slot. The booking has to re-check, hold the slot, and treat all-day events, tentative invites and recurring meetings the way the host expects.
- Provider app review. Google gives reading Calendar events as an example of a sensitive scope, which needs verification before the public can use your app freely: a privacy policy on your domain, a public home page, domain ownership verified in Google Search Console, a written justification for each scope and a video of the permission flow. Google says this can take up to 10 days, and a user cap applies until it passes. Microsoft and Zoom have their own registration steps.
- Rate limits. Google's Calendar API allows 600 requests a minute per user and 10,000 a minute per project, and answers with 403 or 429 errors beyond that. A busy booking page that asks Google on every visit hits them fast.
When We Are Not the Right Choice
If you need a booking link for your own business, use Calendly or a tool like it. Calendly has a free plan, and its Standard plan is $10 per seat per month on its pricing page. No custom build competes with that. Build your own when scheduling is the product you sell: booking for one industry with its own rules, scheduling tied to your own data, or booking inside a larger product.
Our fixed-price MVP model is also a poor fit if you need regulatory certification before anyone touches the product, if you are answering an enterprise RFP that needs 50 or more engineers, or if your calendars sit on old in-house servers, which we price only after reading their documentation. To test demand before paying for code, read no-code vs custom MVP. If hosts and guests need live chat, see the team chat cost breakdown.
After launch, extras such as CRM sync or SMS reminders run on our Growth Partner retainer, from $5,000 a month for 60 hours, month to month with 7 days notice.
Get a Fixed Price for Your Calendly-Style App
Tell us who books whom and which calendars they use. On a free call we will confirm which version fits, fix the price, and flag anything that needs a provider's review.
Book a Free Call →Frequently Asked Questions
How much does it cost to build an app like Calendly?
At minidev.pro, a lean web MVP of an app like Calendly costs $8,750 fixed: the $5,000 base, subscription billing, reminder emails, and Google Calendar, Microsoft Outlook and Zoom integrations at $750 each. A test version synced to Google Calendar only is $5,750, and a version with teams and routing is $10,250. By our estimate, a typical agency quote for the lean scope is $65,000 to $180,000 or more.
How long does it take to build an app like Calendly?
About 40 days for the lean MVP, which is 26 working days of build time. The Google Calendar test version takes 30 days or less, and the version with teams takes 40 to 45 days. Start Google's app verification in week one: Google says its review of sensitive scopes, such as reading calendar events, can take up to 10 days.
Do I need Google Calendar, Outlook and Zoom in version one?
No, only the calendar your first users live in. If they use Google, Google Calendar alone covers a test, and hosts can paste a fixed video link into each meeting type. Add Microsoft Outlook when you sell to companies on Microsoft 365, and Zoom when hosts want a fresh meeting link per booking. Each integration is +$750 and about one build day on our price list.
How much does a scheduling app cost to run each month?
About $304 a month in our worked example with 300 paying hosts and 18,000 bookings: $219.60 in Stripe fees, $39.80 for email, $25 for the database and $20 for hosting. Google lists no additional cost for standard Calendar API use within its quotas. Check Microsoft's and Zoom's current developer terms for their APIs before you budget.
Should I build my own scheduling app or just use Calendly?
Use Calendly if you only need booking links for your own business: it has a free plan, and its Standard plan is $10 per seat per month. Build your own when scheduling is the product you sell, for example booking for one industry with its own rules, or when booking has to work inside a larger product with your own data.
Sources
All outside pages checked November 2026. Prices and plans change, so check each provider's page before you budget. We did not check Microsoft's or Zoom's API terms, so their costs are not in the arithmetic above.
- Fortune, "Meet the unicorn founder that braved war zones and missed meetings to make his mark on the startup world", Lucinda Shen, November 19, 2020 (Calendly founded in 2013; demo-call frustration; development firm in Kiev; free base version, no payments at the start; $550,000 raised; bootstrapped to profitability): fortune.com/2020/11/19/calendly-founder-tope-awotona-startup-unicorn
- Calendly, Pricing (Free, Standard at $10 per seat per month, Teams and Enterprise; round robin, routing forms and Salesforce on Teams; HubSpot on Standard; calendar connections per user; SSO on Enterprise): calendly.com/pricing
- Google for Developers, Google Calendar API usage limits (no additional cost for standard use; 10,000 requests a minute per project and 600 per user; 403 and 429 errors; charges above quota planned for later in 2026): developers.google.com/workspace/calendar/api/guides/quota
- Google for Developers, Sensitive scope verification (reading Google Calendar events as an example of a sensitive scope; what verification requires; up to 10 days; user cap before verification): developers.google.com/identity/protocols/oauth2/production-readiness/sensitive-scope-verification
- Stripe, Pricing (2.9% + 30¢ per domestic card charge; Billing at 0.7% of billing volume): stripe.com/pricing
- Vercel, Pricing (Pro at $20 a month per developer seat; Hobby for personal, non-commercial use): vercel.com/pricing
- Supabase, Pricing (Pro from $25 a month): supabase.com/pricing
- Resend, Pricing (Pro at $20 a month for 50,000 emails; extra emails $0.90 per 1,000): resend.com/pricing
- minidev.pro, MVP cost calculator price list: minidev.pro/mvp-cost-calculator
- minidev.pro, Schedullr case study: minidev.pro/case-studies/schedullr