Zavu
Unified messaging API and agent runtime for developers who need WhatsApp, SMS, voice, email, and Telegram behind one integration.
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Zavu is the clearest choice for developers building AI agents that need to talk across multiple channels without managing five separate vendor relationships. The free plan is genuinely usable, but the platform is early-stage and the SDK coverage has gaps: voice calls are not yet reachable through any of the five official SDKs, only through raw REST. Teams whose primary need is pure code assistance rather than messaging infrastructure should skip it entirely; this is a CPaaS, not a coding tool.
What is Zavu?
Zavu is a unified messaging API and agent runtime for developers and AI agents. Send and receive on WhatsApp, SMS, voice, email, Telegram, Instagram and Messenger through one integration, one webhook contract and one bill. Leave the channel on auto and Zavu routes by cost and deliverability, with fallback. Official SDKs for TypeScript, Python, Ruby, Go and PHP, a CLI, an MCP server and coding-agent skills. Free plan with no credit card.
How we scored Zavu
Capability scores 18 because the channel breadth (seven channels behind one API with ML routing, memory units, and an agent runtime with MCP support) is genuinely differentiated, but voice calls being absent from all five official SDKs is a concrete gap in a platform that bills itself as a unified voice-and-messaging API. Value scores 18 because $20/month returning as $20 of usable credit with no WhatsApp markup and a real multi-tenant feature is fair pricing for what Pro delivers, and the free plan is a genuine sandbox. Ease of use scores 17 because the CLI, five SDKs, and Supabase/n8n/Zapier integrations lower the onboarding bar meaningfully, but the SDK voice gap forces developers to context-switch to raw REST for a core channel. Delivery scores 9 because there are no independent user reviews, no published uptime history, no third-party benchmarks, and the platform is early-stage with a small public footprint; the 'reduces messaging costs by up to 80%' claim on the Supabase partner page has no sourced evidence behind it, and the Studio service is explicitly at launch pricing with no track record yet.
Pros and cons
What we liked
- Free plan includes real WhatsApp testing through Zavu's own number with no credit card required, making it a genuine sandbox rather than a time-limited trial.
- Pro at $20/month is multi-tenant with per-client spend limits, a feature set that competing CPaaS platforms typically reserve for higher-priced tiers.
- Zero markup on WhatsApp messaging on every plan, plus ML-powered channel routing that automatically picks the cheapest reliable path per destination.
Where it falls short
- Voice calls are not reachable through any of the five official SDKs (TypeScript, Python, Ruby, Go, PHP); developers must use raw REST for voice, which undercuts the 'one SDK' promise for a core channel.
- The free plan caps channel connections at two (only one of which can be WhatsApp), so any project needing simultaneous WhatsApp plus Instagram plus SMS requires an immediate upgrade to Pro.
- Zavu is an early-stage product with a small public footprint; there are no substantial independent user reviews, published uptime history, or third-party benchmark data to validate reliability claims at scale.
Key features
Zavu pricing
Free plan at $0/month includes 2,000 WhatsApp/Telegram/Instagram/Messenger messages per month, $2 of SMS/voice/email credit, and 250,000 memory units. Pro is $20/month, which comes back as $20 of credit for SMS/voice/email, with no message cap on WhatsApp and unlimited channel connections. Enterprise is custom-priced with negotiated rates, postpaid NET-30 invoicing, multi-zone redundancy, and an uptime SLA. A 'Studio' done-for-you build service starts at $2,450 one-time (launch half-price from a normal $4,900), and a managed service starts at $1,250/month (launch half-price from $2,500/month).
| Plan | Price | Who it is for |
|---|---|---|
| Free | $0/mo | Two channel connections (one can be WhatsApp); 2,000 messages/month on WhatsApp, Telegram, Instagram, and Messenger; $2 of credit for SMS, voice, and email; 250,000 memory units/month; full API, webhooks, CLI, MCP, agent skills, and LLM proxy. No credit card required. WhatsApp testing available through Zavu's own number. |
| Pro | $20/mo | Everything in Free, plus unlimited channel connections and accounts; no message cap on WhatsApp, Telegram, Instagram, and Messenger; $20 of monthly credit for SMS, voice, and email (subscription amount returned as balance); multi-tenant with per-client spend limits; ability to buy and connect numbers; 2 million memory units/month, then $5 per additional million. |
| Enterprise | Custom | Everything in Pro, plus volume-negotiated rates, postpaid invoicing with NET-30 terms, multi-zone redundancy, an uptime SLA, and a named engineer assigned to the account. |
| Studio Build | From $2,450 one-time | Done-for-you agent design, build, and deployment inside the customer's own Zavu account. Includes channel approvals (10DLC, WhatsApp), system integrations, prompt engineering, and testing. Normally $4,900; launch pricing is half price while first Studio projects are onboarded. Four to six week delivery. |
| Studio Managed | From $1,250/mo | Ongoing management after launch: weekly conversation review, prompt and flow tuning, new tool and channel additions, a named engineer, monthly change report, and 24/7 support with a 30-minute response SLA. Normally $2,500/month; launch pricing is half price. |
Pricing reflects what we saw at time of review (2026-10). Always confirm current pricing on the tool's own site.
Who should use Zavu?
A solo developer or small team building an AI agent that needs to reach users on WhatsApp and fall back to SMS when WhatsApp is unavailable will get real value from Zavu's free plan before spending a dollar. The multi-tenant Pro tier at $20/month is a good fit for agencies or indie developers who build messaging products for multiple clients and want per-client spend controls without paying per seat.
Anyone whose primary need is AI-assisted code writing, autocomplete, or codebase understanding should look elsewhere. GitHub Copilot integrates directly into the editor and handles code generation, explanation, and agentic workflows inside VS Code and JetBrains without any messaging infrastructure concern. If the goal is a full AI-first code editor rather than a messaging API, Cursor is the stronger choice in this directory.
Skip it if: Teams looking for an AI code editor or autocomplete assistant
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Frequently asked questions
Is there really no credit card required for the free plan?+
Correct. The Free plan is $0/month with no card required. It includes $2 of SMS/voice/email credit and 2,000 WhatsApp/Telegram/Instagram/Messenger messages per month, and you can test WhatsApp delivery through Zavu's own number before connecting your own.
What happens when my credit balance hits zero?+
Sends stop and nothing is charged. Zavu is prepaid: when the balance reaches zero, the API returns a 402 error with code insufficient_balance and the message is not dispatched. No unexpected invoice can be generated.
Can I use Zavu to serve multiple clients from one account?+
Yes, but only on Pro ($20/month) or Enterprise. The Pro plan is explicitly multi-tenant, letting you run the platform for your own clients with individual spend limits per client.
Do the SDKs cover voice calls?+
Not yet. The SDK comparison table in Zavu's own documentation shows voice calls as unavailable across all five SDKs (TypeScript, Python, Ruby, Go, PHP). Voice is reachable through the REST API directly.
Does Zavu add a markup on WhatsApp messaging costs?+
No. Zavu charges $0 markup on WhatsApp on every plan, including Free. You pay Meta's carrier rates from your balance with no additional margin added.
What does the $20 Pro subscription actually buy in terms of credit?+
The $20 monthly subscription fee comes back as $20 of balance credit for SMS, voice, and email. WhatsApp, Telegram, Instagram, and Messenger messaging has no cap on Pro and is not drawn from that credit balance.
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