Generous quotas, hard caps, and no surprise bills. Scale when you're ready.
Free forever — for evaluating Zellbox
For growing teams
For production workloads at scale
Production-scale enterprise teams
We compare only the points where the operating model differs materially. Common features are omitted.
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| Feature | Zellbox | Calendly + HubSpot |
|---|---|---|
| Native WhatsApp Business API | Yes — Embedded Signup | No (Calendly) / via integrations (HubSpot) |
| WhatsApp Coexistence (number works in both app + API) | Yes — via Meta Embedded Signup | Calendly: N/A (no WhatsApp). HubSpot: depends on integration |
| Bidirectional Google Calendar | Yes — native | Yes — Calendly is calendar-first |
| Usage-based pricing (not per-seat) | Yes | Per-seat (HubSpot $20-150/seat/mo) |
| Free forever tier | Yes — Starter | Calendly free; HubSpot has limited free |
| GDPR send-and-sign consent built-in | Yes — PDF signed in record | No — integrate with DocuSign/etc. |
| Visit-driven SMB vertical focus | Yes — clinic / fisio / aesthetics / vet | Generic SMB |
| Pre-approved Meta WhatsApp templates | Yes — sector catalog ready | N/A — no WhatsApp |
Comparison based on publicly listed feature pages as of the post date. Competitors' offerings may evolve — verify before deciding.
How does the customer and message limit work?
Each plan includes a monthly allowance of customers, appointments, and outbound WhatsApp messages. Quotas reset on the 1st of each month. You'll get warning emails at 80% and 100% of your allowance.
What happens when I hit my plan's monthly cap?
We pause outbound WhatsApp sends until the next reset or until you upgrade. Inbound messages and calendar sync keep working — you never lose customer data because of a usage cap.
Does WhatsApp Business cost extra?
No. Zellbox absorbs the WhatsApp Business API conversation fees that Meta charges us — your subscription is the only line item you'll pay, and it covers both the platform and the WhatsApp traffic within your plan's monthly cap.
How does Google Calendar integration work?
Each user connects their Google Calendar via OAuth. Zellbox reads upcoming events that match your customer records and triggers reminders accordingly. We never write to your calendar without your action.
Can I cancel anytime?
Yes. Cancel from the billing portal — no lock-in. Your subscription stays active until the end of the paid period, then drops to the free tier. Customer data is preserved.
What happens to my data if I downgrade?
Customer records and conversation history are preserved. Plan-gated features (advanced automation, additional team seats, higher quotas) become unavailable until you upgrade again.
Is my customer data encrypted?
Yes — data is encrypted at rest and in transit. Zellbox is GDPR-compliant; you can export or delete all your customer data at any time from your account settings.
Do you offer a team or enterprise plan?
Yes — see the Enterprise tier on this page (50,000 customers, 100,000 appointments, 50 team seats, custom developments, dedicated support). For anything beyond that, or tailored compliance documentation, reach out via /support.