| Capability | Voxovo | Vapi |
|---|---|---|
| BYO telephony | Twilio, Telnyx, Plivo, Vonage, SIP — keep your numbers | Strong Twilio / SIP story; BYO varies by plan |
| Latency transparency | Per-call STT/LLM/TTS scorecards + public bake-off page | Dashboards; public bake-offs less central |
| Presence Buffer | Native fillers + arming by mode (sounds human on hold) | Custom logic / tools typically required |
| Multi-STT | Deepgram, AssemblyAI, Gladia, Whisper variants | Multiple providers; Custom mode often Deepgram-centric |
| Workflows / multi-agent | Workflow Studio default — publish journeys to phone | Squads / assistants; different mental model |
| Call outcomes | Dispositions + call.outcome webhooks after hangup | Depends on your post-call tooling |
| Publish Guard | Structural graph checks before go-live (not full Voice CI) | Deploy discipline left to your process |
Competitor features change often — treat this as a buyer checklist, then verify with a side-by-side Test Live on your numbers. See also our latency benchmarks and case studies.