AssemblyAI vs Kaldi
On the evidence we track, AssemblyAI leads this comparison with a composite score of 78/100. Scores are only directly comparable because these tools share a category; the full breakdown and every source is below.
Capabilities
Feature-by-feature on the axes that matter for speech to text. “-” means undocumented, not absent.
What each one is
The product in its own terms, so the numbers below have context.
AssemblyAI
LeaderA hosted service offering speech-to-text transcription across 99 languages with real-time and batch processing, speaker identification, sentiment analysis, and infrastructure for building voice agents.
Kaldi
A free, open-source framework for building and deploying speech recognition systems, supporting multiple platforms from desktop to mobile and in-browser execution.
Pricing
List pricing as published by each vendor, with the date we read it. Always verify at the source before you buy.
Platform & deployment
Where each product runs and how it can be hosted. A dash means undocumented, not unsupported.
Integrations
What each product connects to. Counts come from the vendor's own integration directory where one exists.
AssemblyAI
Leader- Semantic Kernel .NET
- Vercel AI SDK
- OpenAI GPT-5.6 Luna
- OpenAI GPT-5.6 Terra
- Google Gemini
- Semantic Kernel
- LangChain
- Twilio
- OpenAI
- Fireworks
- AWS Bedrock
- MiniMax
- Google Cloud Storage
Kaldi
Not documented yet.
AssemblyAI or Kaldi: which one depends on you
A composite score cannot know your constraints. Describe them and both get re-weighted against what you actually need, with the evidence behind every position.
Free to run, no account needed to start. How the evaluation works
Comparison generated from independently-sourced facts. Every value links to its source and retrieval date. See the method.