Deepgram
Deepgram is a developer speech platform best known for fast, cheap, accurate speech-to-text via its Nova model family, plus Aura text-to-speech and a voice-agent API. Pricing is pay-as-you-go per minute (Nova STT from roughly $0.0077/min, with promotional rates lower) and $200 in free credits to start, making it one of the cheapest production STT options. It's optimized for real-time, high-throughput voice applications and competes directly with AssemblyAI. Like AssemblyAI, it's infrastructure for builders, not a consumer-facing tool.
Hume AI
Hume AI is the emotion-intelligence specialist: its Empathic Voice Interface (EVI) and Octave TTS are trained to read and respond to vocal emotion, not just words, drawing on models tuned across dozens of emotions and hundreds of voice descriptors. It offers developer APIs for speech-to-speech, TTS, and expression measurement, with a real (if thin) free tier and cheap entry plans from $3/mo. Pricing is dual-metered -- TTS characters and EVI minutes are billed separately -- which adds complexity. It's unbeatable when you need a voice that feels, and overkill for plain narration.
Deepgram edges Hume AI on aggregate — 86 vs 81.
Among the fastest and cheapest production speech-to-text APIs -- a developer tool, not a consumer app, and a direct AssemblyAI rival. Hume AI still wins for buyers who prioritise unique empathic, emotion-aware voice (evi). Both tools are independently scored — the right pick depends on which dimensions matter most for your workflow.
Side-by-side, every cell sourced.
Pricing pulled from each tool's public site. Scores follow the BigBang Score rubric — pricing transparency, free tier, API support, update frequency, unique factor, documentation, and community.
Use-case picks.
Cut through the spec sheet. Here's what we'd recommend depending on what matters most.
Pick Deepgram if…
You prioritise very fast, low-latency speech-to-text and among the cheapest per-minute stt pricing.
Pick Hume AI if…
You prioritise unique empathic, emotion-aware voice (evi) and cheap entry ($3 starter) plus a real free tier.
Editorial pick
Deepgram wins our composite score (86/100). It edges ahead on aggregate — but the right tool depends on which dimensions matter most.
Related head-to-heads in AI audio.
Deepgram vs ElevenLabs — AI audio
BigBang Scores 86/100 vs 88/100. Pricing, capabilities, and editorial verdict inside.
Deepgram vs AssemblyAI — AI audio
BigBang Scores 86/100 vs 88/100. Pricing, capabilities, and editorial verdict inside.
Deepgram vs Cartesia — AI audio
BigBang Scores 86/100 vs 88/100. Pricing, capabilities, and editorial verdict inside.
Deepgram vs Hume AI - frequently asked.
Direct answers tuned for AI search engines (ChatGPT, Perplexity, Claude) and Google's People Also Ask.
The short answer.
Deepgram wins on aggregate, but Hume AI pulls ahead on specific axes - the spec sheet above shows where each one earns its keep.