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Zavu Inbox
What it is
Zavu Inbox is an open-source messaging API with a web interface for sending and receiving communications across channels. Inbox threads are ordered by recent activity and gather messages from each thread’s channels. Supported channels include WhatsApp, SMS, one-way SMS, voice, email, Telegram, Instagram, and Messenger. Automatic routing can select a channel using the recipient and the sender’s configured channels. AI agents can answer through messaging channels and phone, use agent-specific knowledge and memory, and call customer-owned tools. The maker lists SDKs for TypeScript, Python, Ruby, Go, and PHP, plus an MCP server, agent skills, CLI, n8n node, and Vercel Marketplace integration. The free plan is free, free forever, with two connections, 2,000 shared monthly messages, and $2 usage credit. Pro costs $20 a month. Voice agents start at $0.07 per minute.
For and against
For
- Supports eight listed communication channels
- Automatic channel selection for outbound messages
- AI agents use knowledge, memory, and tools
- SDKs for five programming languages
- Free plan includes two connections
Against
- Free plan limits shared messages to 2,000 monthly
- Prepaid sending stops when balance reaches zero
- Premium voice models and voices cost extra
- BYOK is unavailable for voice agents
The verdict
Zavu Inbox provides broad channel coverage, developer integrations, and AI-agent capabilities through one messaging API. Check message limits, prepaid behavior, and voice pricing when planning usage.
Who it suits
Zavu Inbox suits developers building multichannel messaging or AI-agent workflows through an API. The free tier fits small channel setups, while Pro provides unlimited channel connections.
Plans and prices
Free Plan
2 connections · 2,000 shared WhatsApp, Telegram, Instagram and Messenger messages/month · $2 usage credit/month
Read 4 Oct 2026 · zavu.dev
Pro
Unlimited channel connections · 2M memory units/month · prepaid usage
Read 4 Oct 2026 · zavu.dev
Managed
Weekly conversation review · ongoing tuning · 24/7 support with 30-minute response SLA
Read 4 Oct 2026 · zavu.dev
Build
Agent designed, built and shipped in the customer's Zavu account · four to six weeks
Read 4 Oct 2026 · zavu.dev
Enterprise
Negotiated rates · multi-zone redundancy and uptime SLA · named engineer
Read 4 Oct 2026 · zavu.dev
On the record
- AI agents
- Agents can answer across messaging channels and phone, use agent-specific knowledge bases and memory, and call customer-owned tools.zavu.dev · read 4 Oct 2026
- Channels
- Supported channels include WhatsApp, SMS, one-way SMS, voice, email, Telegram, Instagram and Messenger.zavu.dev · read 4 Oct 2026
- Company
- The privacy policy identifies the legal entity as Zavu Labs Inc., incorporated in Delaware, United States, and gives a Dover, Delaware business address.zavu.dev · read 4 Oct 2026
- Founder
- The maker's homepage names Victor Villalobos as Founder & CEO of Zavu.zavu.dev · read 4 Oct 2026
- Free tier limit
- The free plan allows two channel connections and 2,000 messages per month shared across WhatsApp, Telegram, Instagram and Messenger.zavu.dev · read 4 Oct 2026
- Inbox
- The API exposes inbox threads sorted by recent activity and messages across each thread's channels.zavu.dev · read 4 Oct 2026
- Integrations
- The maker lists TypeScript, Python, Ruby, Go and PHP SDKs, an MCP server, agent skills, a CLI, an n8n node and a Vercel Marketplace integration.zavu.dev · read 4 Oct 2026
- Planned integrations
- Zapier, Make, HubSpot, Salesforce, Shopify, WooCommerce, Zendesk, Intercom and GitHub are marked Coming Soon on the integrations page.zavu.dev · read 4 Oct 2026
- Prepaid limit
- Zavu says sending is rejected when the prepaid balance reaches zero, while inbound messages and webhooks keep working.zavu.dev · read 4 Oct 2026
- Product
- Zavu describes itself as a unified messaging API for sending and receiving communications across channels.zavu.dev · read 4 Oct 2026
- Routing
- Zavu can automatically select a channel based on the recipient and the sender's configured channels.zavu.dev · read 4 Oct 2026
- Support
- Pro includes direct chat with Zavu engineers from 9am to 7pm Eastern Time, Monday to Friday; free users get an in-product assistant and Discord community.zavu.dev · read 4 Oct 2026
- Voice pricing
- The pricing page lists voice agents from $0.07 per minute and says premium models and voices cost extra and BYOK is unavailable for voice agents.zavu.dev · read 4 Oct 2026
- Webhook security
- The messaging API page says webhooks carry an X-Zavu-Signature using HMAC; v2, which signs the timestamp with the body, is the default for new senders.zavu.dev · read 4 Oct 2026
