Deepgram vs Vapi
Two of the most-asked-about agents in the speech-to-text space. Here's how they actually stack up.
Deepgram
Speech-to-text API and voice agent platform built for real-time low-latency applications
Free tier
Read full review →Vapi
Developer-focused voice AI platform for building production-grade voice agents via API
Free tier
Read full review →Side-by-side comparison
| Deepgram | Vapi | |
|---|---|---|
| Tagline | Speech-to-text API and voice agent platform built for real-time low-latency applications | Developer-focused voice AI platform for building production-grade voice agents via API |
| Pricing | Free tier | Free tier |
| Categories | speech-to-text, voice-agents, api | voice-agents, api, conversational-ai |
| Made by | Deepgram | Vapi |
| Launched | 2015 | 2022 |
| Platforms | API, Python SDK, JavaScript SDK, Go SDK, .NET SDK | API, Web, Phone |
| Status | active | active |
Deepgram highlights
- + Nova-3 model for transcription with best-in-class accuracy on English and 36 other languages
- + Real-time streaming transcription with word-level timestamps and under 300ms latency
- + Aura TTS for low-latency text-to-speech optimized for voice agent pipelines
- + Speaker diarization for multi-speaker audio separation
- + Deepgram Voice Agent API for end-to-end voice agent deployment
Vapi highlights
- + Real-time streaming voice with sub-500ms response latency on most configurations
- + Bring your own LLM: works with OpenAI, Anthropic, Groq, Together, and local models
- + Bring your own STT and TTS providers including Deepgram, ElevenLabs, and Play.ht
- + Phone number provisioning and outbound/inbound call management via API
- + Function calling and tool use for external integrations mid-conversation
Frequently Asked Questions
Which is better, Deepgram or Vapi?
Neither is universally better. Deepgram (Free tier) leans into speech-to-text, while Vapi (Free tier) is closer to voice-agents. Pick based on which workflow you actually do every day.
What is the price difference between Deepgram and Vapi?
Deepgram is free tier. Vapi is free tier. See the pricing row in the comparison table.
Can I use Deepgram and Vapi together?
In most cases, yes. They serve overlapping but distinct needs, so running them side by side is common until you decide which fits your workflow.