Welcome to Zellbox — one CRM for visits and conversations

Take any team that books customer appointments and stays in touch on WhatsApp. A dental clinic. A plumber’s office. A salon. A real-estate agent. A vet. A coaching practice. They all do the same dance: someone schedules the visit in a calendar, someone sends a WhatsApp reminder the day before, someone confirms the morning of, someone replies to a follow-up question — usually four different someones, often on personal phones.

When the customer calls back two weeks later and asks for “the woman who handled my appointment last month,” whoever picks up the phone has no idea who they’re talking about.

I’ve watched friends and customers struggle with this for years across very different businesses. The pattern is identical:

• Visits live in Google Calendar, but only the person who booked them knows what they’re for.
• Conversations live in WhatsApp, but on individual employees’ personal phones.
• Customer records live in a spreadsheet — or in someone’s head.

Tools exist for each of those silos, but the tools don’t talk to each other, and the operational reality is messy. Most CRMs are built for inside-sales pipelines, not for “Diego is at the patient’s home right now and needs to send a quick photo.” Most universal-inbox tools are great at consolidating channels but weak at understanding the appointment-driven workflow.

What Zellbox is

Zellbox is the smallest tool that solves the appointment-and-conversation workflow end-to-end:

• Google Calendar is the source of truth for when the appointment happens.
• The official WhatsApp Business API is the channel customers actually use.
• A shared inbox keyed on the customer record is where the conversation history lives.

You connect Google Calendar once per user. Zellbox watches for events that match a customer record and surfaces them as scheduled visits. From there, automation kicks in: a pre-visit reminder template, a confirmation request the morning of, a post-visit follow-up — review request, rebooking nudge, care instructions, whatever fits your industry.

Templates go out through the WhatsApp Business API: Meta-approved, properly attributed to your business phone number, billed at Meta’s wholesale rates with no Zellbox markup.

When the customer replies — or sends an inbound message at any time of day — it lands on their thread in the Zellbox inbox. Anyone on your team can pick it up; the customer record, the visit history, and every previous message are right there.

Who it’s for

Zellbox is industry-agnostic, but if you want a concrete example, here’s how it shows up across different teams:

• 🏥 Medical and dental clinics — appointment reminders that reduce no-shows; secondary checks before a procedure; follow-up care instructions afterward.
• 💼 Field sales teams — visit reminders for reps; a customer history shared across the whole team; “on my way” pings; post-meeting recap automation.
• 🔧 Home services — plumbers, electricians, HVAC, cleaning. Job-day reminders, on-the-way notifications, post-visit reviews.
• 💇 Salons, spas, wellness — booking confirmations, rebooking nudges at the right interval, birthday vouchers, last-minute slot offers.
• 🐾 Veterinary clinics — vaccine reminders, post-procedure check-ins, emergency-line triage without losing the conversation thread.
• 🏘️ Real estate, coaching, tutoring — viewings, sessions, follow-ups. One conversation thread per contact, no matter who on the team handled it last.

The three pillars (Calendar / WhatsApp / Inbox) are universal — only the templates and automation rules vary.

What we’re not building

Zellbox is not a full pipeline-and-deal-stages CRM. We’re not trying to replace HubSpot or Salesforce. If your job involves quotas, opportunity rollups, and forecast roll-forwards, you’ll be much happier in one of those.

We’re also not building Yet Another Universal Inbox. Plenty of those exist; most are great at consolidating channels but weak at understanding the appointment-driven workflow specifically. Zellbox is opinionated: customers, visits, conversations. Three entities, deeply connected.

The road ahead

The marketing site, the docs, and the signup flow are live today. The product itself is rolling out in iterative releases over the next few months:

• Customer records + manual visit scheduling — first
• Google Calendar integration with automatic visit detection — next
• WhatsApp Business connection + outbound template sends — after that
• Inbound webhook + the unified inbox — the milestone that makes the whole thing click
• Reminders engine — pre/during/post-visit automation, with industry-specific template starters

If you run a clinic, a salon, a sales team, a home-services crew — or you know someone whose life would be measurably better with this — please sign up. Early adopters will shape what we build, in what order, and how it feels day-to-day.

If you have feedback, opinions, or stories from your industry’s specific take on this workflow — I’d genuinely love to hear them. hello@support.zellbox.com.

— Nacho