How to Try Deepgram's Voice AI Products for Free

Updated

You can try Deepgram at no cost through two routes shown on its site: a general "Try for free" option and a "Get a demo" request. If you specifically want to build with the new Flux TTS model, the site states it is free to build with through September 12th, with a cap of up to 45 concurrent streaming connections in the US and 5 in the EU and AU. Those are the only free-access details the site provides; pricing for ongoing use beyond the trial or the Flux TTS window is not listed, so treat continued access as something to confirm with Deepgram.

What you can try

Deepgram presents one platform covering the full voice AI stack:

Product What it does
Speech-to-text (STT) Real-time transcription with production accuracy; Flux STT detects end-of-turn and interruptions
Text-to-speech (TTS) Expressive voices with latency as low as 80ms; Flux TTS is built for live conversation
Voice Agent Real-time conversation through a single API call
Audio Intelligence Extracts insight from every conversation

The site also mentions a Flux TTS promotion: spend $1 on Flux TTS and get $1 back, up to $500.

Start with the free trial or demo

  1. Go to deepgram.com and choose Try for free to begin building, or Get a demo if you want a guided walkthrough first.
  2. Pick the product that matches your task — for example, STT if you need transcription, or the Voice Agent API if you want an end-to-end conversational agent.
  3. If you are testing Flux TTS during the free window, keep your concurrent streaming connections within the stated limits (45 in the US, 5 in the EU and AU) so you stay inside the free build terms.
  4. Verify your setup by running a short real-time session and checking that transcripts stream and TTS audio plays back as expected.

How the unified Voice Agent API fits in

Rather than stitching together separate components, Deepgram combines STT, TTS, and LLM orchestration into one API. In the flow the site describes:

  • Audio input comes from a transport layer (including telephony partners via PSTN/SIP) that bridges streamed audio into Deepgram's APIs and plays TTS audio back to the user.
  • STT recognizes conversational speech, detects end-of-turn and interruptions, and streams transcripts in real time.
  • LLM orchestration manages context, memory, and reasoning — conversation history, system and prompt updates, response injections, and function calling — connecting to language models via API.
  • TTS converts responses into natural-sounding speech.
  • Business logic and external systems execute domain-specific actions and feed results back into the conversation context.

This matters for a trial because a single API call replaces several integrations, which reduces complexity, latency, and cost — and gives you fewer moving parts to validate before deciding whether to continue.

Common sticking points

  • Region limits on Flux TTS: the free build window caps concurrent streaming connections by region, so a US-based test can scale further than one in the EU or AU.
  • Time-bound offer: the Flux TTS free build period ends September 12th; plan your evaluation before then if that model is your focus.
  • Deployment choice: the platform is available in real time or batch, in the cloud or self-hosted — confirm which option your trial uses before benchmarking latency.
  • Beyond the trial: the site does not publish ongoing pricing, so ask about costs for production scale rather than assuming the free terms carry over.