Cervana vs. Vapi.
Vapi is a cloud orchestration layer that wires external voice and language APIs into a phone agent. Cervana is the on-premise alternative — a fully integrated stack you run yourself.
Vapi made building cloud voice agents fast — paste in API keys for OpenAI, ElevenLabs, and Deepgram, and you have a working agent in minutes. The cost is that every call routes through Vapi plus three or four external vendors, with audio and transcripts touching each of their clouds. For most consumer-facing or non-regulated use cases, that's fine. For a regulated buyer, the supply chain is the problem. Cervana eliminates the chain: you get a single integrated stack — ASR, LLM, TTS, orchestration, audit log — that runs entirely inside your perimeter.
| Axis | Cervana | Vapi |
|---|---|---|
| Deployment model | On-premise + private cloud, single-tenant | Multi-tenant SaaS in Vapi's cloud |
| Stack composition | Single integrated stack — ASR, LLM, TTS, orchestrator all yours | Orchestrator that wires external LLM + TTS APIs together |
| Outbound API calls during a call | Zero — egress gate blocks them | Multiple — to OpenAI, ElevenLabs, Deepgram, etc. |
| Where audio + transcripts live | Your servers only, your jurisdiction | Vapi's infrastructure plus every external API in the chain |
| Sub-processor count | Typically zero (single-tenant deployment) | Vapi + every API vendor you select (often 3–5) |
| Audit logs | Signed, hashed, replayable in your store | Distributed across vendor consoles |
| Speed to first call | Days (deployment + integration) | Minutes (sign up, paste API keys) |
| GDPR / DORA / CBUAE fit | Native — entire stack inside your regulated perimeter | Possible only with extensive vendor DPAs and risk acceptance |
| Pricing model | Annual license + your infra costs | Per-minute + per-token pass-through from underlying APIs |
| Operates without internet egress | Yes — air-gapped deployments supported | No — call orchestration depends on external APIs |
Pick Vapi if…
You want to ship a voice agent this week, you're operating in a non-regulated space, and you're comfortable accepting the joint vendor liability of Vapi plus the underlying API providers.
Pick Cervana if…
You're a regulated enterprise or a vendor selling into one. Your procurement team flags every new sub-processor as a risk item. Your CISO has asked 'who else touches this audio?' and the answer 'nobody' is the only acceptable one.
The takeaway
Vapi optimizes for speed-to-prototype. Cervana optimizes for compliance and supply-chain control. If your buyer is a financial services firm, a hospital, or a government agency, Vapi's vendor sprawl is the disqualifier — and Cervana's single integrated on-prem stack is the answer.