Communication infrastructure
for AI agents
Kapso is a WhatsApp API for developers. Official WhatsApp, workflows, AI agents, and a team inbox. Zavu is one API for WhatsApp, SMS, email, Telegram, Instagram, Messenger and voice, with agents, broadcasts and serverless functions.
No credit card. Free includes $2 of monthly credit.
Feature comparison
What each company publishes. Kapso's site and docs are a WhatsApp product. Zavu publishes one API across seven channels.
| Feature | Zavu | Kapso |
|---|---|---|
| Official WhatsApp API | ||
| Templates and webhooks | ||
| SMS, email, Telegram, Instagram, Messenger | — | |
| Phone calls on a phone number | — | |
| WhatsApp voice calls | — | Your own voice runtime |
| AI agents | ||
| Visual workflows | ||
| Serverless functions | TypeScript | JavaScript |
| Broadcasts | WhatsApp, SMS, email, Telegram | WhatsApp templates |
| Inbox | Every channel | WhatsApp, unlimited seats |
| CLI and agent skills | ||
| Hosted MCP | — | |
| WhatsApp Flows | — |
Pricing comparison
Published plans. Meta's WhatsApp fees are separate on both, and neither adds a markup.
| Item | Zavu | Kapso |
|---|---|---|
| Free | $0. 2,000 app messages. $2 of monthly credit. | $0. 2,000 WhatsApp messages. $2 in credits. 1 connected number, plus a pre-verified US number. |
| Pro | $20/mo. $20 credit. App messages not capped. 1 US or Canadian number. | $25/mo. 100,000 WhatsApp messages. 3 numbers, then $10/mo. |
| Higher volume | Enterprise, custom | Platform $299/mo. 1,000,000 messages. 50 numbers, then $5/mo. |
| Meta WhatsApp fees | Billed by Meta. No markup. | At cost through Kapso, or direct to Meta. |
| Extra WhatsApp number | 1 account on Pro, then $7/mo. | Counts above, then $10/mo on Pro or $5/mo on Platform. |
| Seats | 1 included. $9/mo each extra. | Unlimited on every plan. |
| Serverless functions | 300,000 calls/mo, then $5 per million. | Included on every plan. |
Kapso plans: kapso.com/pricing. Zavu plans: zavu.dev/pricing. Meta charges WhatsApp by category and country. Those rates are not in this table.
Where each one fits
Same job on WhatsApp. A different product once the agent leaves it.
Kapso
- The published product is WhatsApp. Official API, templates, webhooks, and WhatsApp Flows.
- A team inbox with unlimited seats on every plan.
- A hosted MCP server, a CLI, and agent skills for coding agents.
- Setup links so customers connect their own WhatsApp numbers. Platform adds centralized Meta billing.
- WhatsApp voice calls. You connect the voice runtime. Kapso handles the call signaling.
Zavu
- One API for WhatsApp, SMS, email, Telegram, Instagram, Messenger and phone calls.
- Voice agents that answer and place calls. The pipeline is $0.0625/min, plus telephony.
- Pro is $20/mo. App messages are not capped. $20 of credit, and one US or Canadian number.
- Broadcasts on WhatsApp, SMS, email or Telegram. Agents, and functions in TypeScript.
- Sub-accounts for clients, with their own API keys and spending caps.
Trusted by growing teams
Real results from real customers
“With Zavu's WhatsApp API we now reach 90% of our customers on the first attempt. Before, half our messages were lost to undelivered SMS.”
Alberto Valladares
CEO, Renee.cl
“Zavu unified WhatsApp, SMS, and AI agents into a single workflow. Response time dropped from hours to seconds.”
Ariel Vaisman
CEO, RendaloMAQ
Questions
Start on Zavu
Free to start. WhatsApp, and the other channels, on one API.