Interesting that you built it full stack with Next.js and Twilio around Vapi instead of a no-code layer. Was that for control over the call logic, or for the client dashboard?
Both, actually! Vault Zero is built on top of my own voice AI platform, Menace Voice (voice.menaceui.com ), which I developed after reverse-engineering Vapi's approach. I chose to go full-stack instead of no-code so I could have complete control over the call logic,...
Crenaly: a booking SaaS I designed and built end-to-end for appointment-based businesses in France: salons, barbers, beauty and wellness.
The core idea: when a client cancels, the freed slot is automatically offered to clients who asked for an earlier time. The first to accept gets it, their appointment moves in place, and the slot they leave is offered next. No double booking, no manual work.
Around it, a full product:
→ Branded booking page for each business, embeddable on their own site
→ Mobile-first booking flow, no account needed
→ Agenda, client management, team roles & permissions
→ Verified reviews, analytics, Stripe billing
Automatically offering a cancelled slot to the next client is such a practical feature for salons and barbers. Designing and building Crenaly end to end must have made those flows much tighter.