WhatsApp Business + Google Calendar for appointment-driven SMBs.
One inbox, one calendar, one team. Automatic reminders, WhatsApp confirmations, appointments synced with the Google Calendar your team already uses — without per-seat pricing.
Built for any business that schedules customer interactions
If your team books appointments and talks to customers on WhatsApp, Zellbox fits — reminders, replies, and the full visit history threaded inside every customer's record.
Medical & dental clinics
Appointment reminders that reduce no-shows. Confirmations, follow-ups, and prescription refills on a channel patients already use.
Medical & dental clinics
Appointment reminders that reduce no-shows. Confirmations, follow-ups, and prescription refills on a channel patients already use.
Field sales teams
Visit reminders for reps, customer history shared across the team, and follow-ups that don't slip through cracks.
Field sales teams
Visit reminders for reps, customer history shared across the team, and follow-ups that don't slip through cracks.
Home services
Plumbers, electricians, HVAC, cleaning. Job-day reminders, on-the-way notifications, and post-visit reviews — all from one place.
Home services
Plumbers, electricians, HVAC, cleaning. Job-day reminders, on-the-way notifications, and post-visit reviews — all from one place.
Salons & wellness
Booking confirmations, rebooking nudges, and birthday vouchers. Less time on the phone, more time with clients.
Salons & wellness
Booking confirmations, rebooking nudges, and birthday vouchers. Less time on the phone, more time with clients.
Veterinary clinics
Vaccine reminders, post-procedure check-ins, and emergency-line triage — without losing the conversation thread.
Veterinary clinics
Vaccine reminders, post-procedure check-ins, and emergency-line triage — without losing the conversation thread.
Real estate & coaching
Viewings, sessions, follow-ups. Schedule once, automate the rest, see every conversation tied to the right contact.
Real estate & coaching
Viewings, sessions, follow-ups. Schedule once, automate the rest, see every conversation tied to the right contact.
How Zellbox runs your day
One app for visits, conversations, and email — replacing the three browser tabs your team juggles today.
Bring your own WhatsApp number via Meta
Meta's sign-up popup gets you live on the official WhatsApp Business API in about 10 minutes. Bring an existing WhatsApp Business number or get a new one — no SIM, no OTP, no paperwork. Your number keeps working in the WhatsApp Business app on your phone via Meta's Coexistence flow — reply from either side, history stays in sync.
DDr. Lee DentalonlineDr. Lee DentalHi Mike! Just a heads-up — your cleaning is tomorrow at 10:00. Bring last visit’s X-rays 🦷09:15✓✓Got it, see you then! 👍09:18MessageTwo-way sync with Google Calendar and Gmail
One Google sign-in, both integrations. Visits scheduled in Zellbox appear in Google Calendar; changes in Google Calendar update Zellbox. Gmail sends from your own address and pulls inbound replies straight onto the right customer record.
Create customers in seconds or import in bulk
Add a customer in seconds, assign their manager, schedule their first visits, pick the reminders to send — all in one screen. Or bulk-import a whole spreadsheet. No context switching.
Automatic WhatsApp reminders for every visit
Drop visits on the calendar from any device. Zellbox plans the WhatsApp reminders the moment you save — at the offsets you choose. 24 hours before, 2 hours before, post-visit follow-up. No manual reminders, no missed visits.
Email templates from your own Gmail
Write the subject, body, and attachments once, then drop in merge fields for customer name, visit time, or any custom field. Welcome emails, follow-ups, reminders the day before — all sent on auto-pilot from your own Gmail address.
Pre-approved WhatsApp templates from day one
Zellbox ships verified appointment templates the moment you sign up. Confirm, remind, follow up — all on Meta's official Cloud API. When your WhatsApp Business number is verified, replace them with your own branded templates.
One inbox per customer — WhatsApp and Gmail together
Customer replies, by text or by email, surface on the customer's record inside Zellbox. Your whole team sees the same context, the same queue, the same history. No personal phones, no shared mailboxes to manage.
Your phone. Your CRM. One WhatsApp number.
Meta's Coexistence feature lets you keep WhatsApp Business on your phone while Zellbox handles the operational side. Reply from either, never lose a thread.
Native WhatsApp features stay alive
Status, groups, catalog, voice + video calls — keep using them on your phone. Coexistence preserves every native WhatsApp surface.
One thread, both sides
A reply from your phone shows up in Zellbox's shared inbox seconds later. A reply from Zellbox lands in your phone's WhatsApp chat. No split history.
Meta-policy compliant
Coexistence is Meta's official feature — not a workaround. No risk of bans or blocks. Reversible too: you can opt out without losing data.
Coexistence requires Meta to enable the feature on your WABA. Standard for new sign-ups since 2024.
Everything an appointment runs on, in one place
Calendar, WhatsApp, and a unified inbox — built to work together so your operators never miss a follow-up.
See the full WhatsApp template library →
One app for calendar, WhatsApp, and email
Stop juggling Google Calendar, WhatsApp Business, and Gmail across three browser tabs. Zellbox runs them all from one screen — every visit, every reply, every reminder.
Automatic WhatsApp reminders
Send approved templates at the right time before each visit — 24 hours before, 2 hours before, post-visit follow-up. All on Meta's official Cloud API, every send tracked on the customer record.
One inbox per customer
Every reply — WhatsApp or email — lands on the customer's record. Your whole team sees the same context. No scattered chats on personal phones.
Frequently asked questions
Quick answers before you sign up. More in the docs.
Is there a free trial?
The free tier itself is the trial — no credit card required. 50 customers, 50 appointments per month, 100 WhatsApp messages on the shared Zellbox number. When you're ready, upgrade in one click. Paid plans are month-to-month, no annual lock-in.
Do I need a WhatsApp Business API account?
No — Zellbox handles the Meta registration via the Embedded Signup popup. Bring an existing number or get a new one from Meta.
How much does it cost to send reminders?
Meta charges per conversation initiated. Zellbox passes through the exact Meta price — no markup.
How long does the setup take?
Creating your account: about 2 minutes. Connecting your own WhatsApp number via Meta: about 10 minutes plus Meta's verification for any new templates (usually a few hours).
What happens to my existing WhatsApp Business number?
If you bring an existing WhatsApp Business number, you migrate it to Meta's Cloud API during the Embedded Signup. Your customer history on Meta's side stays intact.
Can I switch from my current system?
Yes — bulk-import your customers from a CSV or XLSX export. Most teams finish the migration in under an hour. We don't lock you in: you can export your data at any time in the same format.
What channels does Zellbox bring together?
Google Calendar, Gmail, and WhatsApp Business — all managed from one screen in Zellbox. No more juggling separate tabs.
How does this compare to using WhatsApp + a spreadsheet?
A spreadsheet doesn't fire reminders automatically, doesn't track delivery, doesn't route replies to the right operator, and doesn't scale past a few dozen customers. Zellbox handles all of that and treats WhatsApp as a first-class channel instead of a side-task.
What about data protection (GDPR / LOPDGDD)?
Zellbox complies with GDPR and LOPDGDD. We use European host providers for customer data where required, sign a Data Processing Agreement on request, separate consent for operational versus marketing messages, and encrypt all data at rest and in transit. Every workspace is isolated from every other.
What Google account permissions does Zellbox request, and why?
Zellbox requests two Google scopes, each only for the workflow it enables. Google Calendar (calendar, calendar.events) — two-way appointment sync: every visit scheduled in Zellbox appears on your Google Calendar, and every change there updates Zellbox. Gmail (gmail.send, gmail.modify) — operators send customer emails from their own Gmail address instead of a generic Zellbox mailer, and replies route back onto the customer record automatically. Both scopes are covered by Zellbox's Google CASA Tier 2 certification (audited July 2026 by an independent lab) and are used under Google's Limited Use policy: your Google data is never sold, never used for advertising, and never accessed outside these two workflows. Full detail in our Privacy Policy §4 — Google user data and Limited Use.
Simple, transparent pricing
Start free. Upgrade when your team grows. WhatsApp Business per-conversation costs are billed by Meta directly — never marked up by us.
Starter
Free forever — for evaluating Zellbox
- Up to 50 customers
- 50 appointments / mo
- 2 team seats
- Shared Zellbox WhatsApp number — 100 messages / mo
Pro
For growing teams
- Up to 500 customers
- 1,000 appointments / mo
- 5 team seats
- Your own WhatsApp Business number — free Meta number or BYO
Business
For production workloads at scale
- Up to 5,000 customers
- 10,000 appointments / mo
- 20 team seats
- Your own WhatsApp Business number — free Meta number or BYO
Enterprise
Production-scale enterprise teams
- Up to 50,000 customers
- 100,000 appointments / mo
- 50 team seats
- Your own WhatsApp Business number — free Meta number or BYO
Ready to fill your agenda?
Start free. Connect Google Calendar and WhatsApp Business in minutes.
Start freeContact us
Questions about pricing, integrations, or whether Zellbox fits your clinic? Drop us a line and we'll reply within one business day.