Looking for the right stack to build a custom chatbot (API, UI, WhatsApp)

Hi everyone,

I’m working with a client who requested a fairly custom chatbot solution and I’d love your advice on the best tools or platforms to focus on. Here are the requirements:

API Integration: The bot needs to pull data from APIs (e.g., product availability, service schedules) and display it back to the user in real time.
Appointment Booking: It should allow visitors to book appointments directly through the chatbot, ideally syncing with an external calendar/CRM.
UI Customization: The client is very particular about the user interface and user experience details. For example, they want small touches like animated “typing” dots and a smooth, human-like interaction style.
WhatsApp Integration: After each visitor’s interaction, the bot should send a summary/resume of the conversation via WhatsApp to the business owner.

I love the assistables - ghl bot configurations but found it had its limitations or i just didnt know how to add API calls nor could i figure out how to tweak the UI

I’m trying to evaluate which tools or frameworks would make the most sense here.

If you’ve built something similar (especially with API pulls + WhatsApp integration), what stack worked best for you?

Appreciate any insight.

5 comments