A Hypothetical Cal.com Clone That Costs Almost Nothing to Run

Hi, I am Rudraksh.
This is not a full-blown startup announcement but more of a hypothetical concept of how I can build a calendar scheduling app like Cal.com, but at a much lower price. I am writing this to share my thought process, get feedback, and maybe inspire others. Of course, there will be limitations in scalability and performance, but that’s fine — this is more of a “how I would design it” piece.

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What is Cal.com?

Cal.com is basically a platform where a client can schedule a discovery call or one-to-one session with you. It integrates with multiple calendars like Google or Outlook and helps avoid the back-and-forth of “When are you free?”

Now, instead of reinventing the wheel, I just thought — why not make a simplified version for personal/freelance use where infra costs stay super low?

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My Tech Choices

I will go with Node.js for the backend because it’s fast, easy to use, and has a big ecosystem.

• JWT authentication → for security and user sessions

• MongoDB Atlas → to store user data (easy scaling + free tier works)

• Redis → for caching and faster user experience

• WebSockets → to push notifications (like reminders or updates) in real time

For hosting:

• Backend on Render (free/cheap tier works well)

• Frontend on Vercel (great for React and Next.js, also free tier friendly)

So infra is cheap, clean, and easy to maintain.

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How I Imagine the Flow

1. First Page → Platform Connect

When a new user signs up, the first page will ask: Which platform do you want to connect with? (Google, Outlook, or Zoom).
This way, they directly sync calendars and conferencing tools.

2. Dashboard → Profile Setup

User sets up how their public profile should look (like “Book a call with Rudraksh”). They can choose availability, description, links, etc.

3. Backend → Data & Notes

Here comes the twist. Instead of storing only appointments, I also integrate:

• Notion API or Google Docs API → to save client details automatically in bullet format

• This can be enhanced with Gemini (AI premium feature) to auto-summarize client info for freelancers

4. Scheduling → Calls & Payments

• The client picks a date → app checks your calendar → generates a Google Meet link automatically

• Notifications go through WebSocket (instant updates instead of email delays)

• If it’s a paid discovery call, then use Stripe.js or Razorpay for payment

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Cost Analysis

The main goal: low infra burn.
For ~1000 active users, cost can be as low as $0 – $5 (thanks to free tiers):

• MongoDB Atlas free tier

• Redis free plan

• Render + Vercel free/cheap tier

So basically, the infra is close to barely anything compared to scaling Cal.com. If one day usage grows massively, of course, infra costs will rise, but at small scale it’s super affordable.

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Why I Like This Idea

• Low infra → doesn’t burn money unnecessarily

• Useful for freelancers, creators, or coaches who just want simple scheduling + payments

• Extensible → can add AI summaries, more calendar integrations, or even analytics later

This is just a raw design thought. I haven’t built it fully yet, but the concept excites me because it mixes practicality (scheduling, payments) with low infra cost (almost free hosting).

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Closing Thoughts

This is not about competing with Cal.com, but showing how you can design a lean version of the same idea, especially useful if you’re a freelancer or small business who doesn’t want to spend much on infra.

If you have thoughts, improvements, or want to collaborate, I’d love to hear from you. 🚀

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If you were building this, which part would you simplify or skip to keep infra even cheaper?