AssemblyAI
- Android app
- Not listed
- Free plan
- Yes
- Paid plans from
- $0.15/mo
- Runs on
- api, self-hosted, Web
Summary
AssemblyAI provides Voice AI models and APIs for speech-to-text, speech understanding, and voice applications. Its Speech Understanding API includes speaker diarization and identification, summaries, action items, sentiment analysis, key phrases, entity and topic detection, formatting, language detection, translation, PII redaction, and content moderation. The platform states that it covers 99 languages and translates into 86. It offers managed-cloud use or self-hosting inside a customer’s environment, with API access and integrations including Twilio, Zoom RTMS, Zapier, LangChain, and Vercel AI SDK. Documentation includes Python and JavaScript SDK guidance. Listed protections include TLS 1.2+ encryption in transit, AES-256 encryption at rest, zero data retention, and an option to opt out of model training. AssemblyAI states that streaming and voice-agent latency is below 300ms. A free tier is available, and usage-based plans are billed monthly. Listed rates include $0.15 per hour for Universal-2 and $0.45 per hour for Universal-3.6 Pro Realtime. Free credits include $50 in audio credits, subject to connection and transcription limits.
Who it is for
It suits developers building speech-to-text or voice applications who want API access, multiple speech-understanding features, or self-hosting. The available SDK guidance is relevant to Python and JavaScript developers.
What is good
- Covers 99 languages and translates into 86
- Includes speaker identification and diarization
- Supports managed cloud or self-hosting
- Offers Python and JavaScript SDK guidance
- Free tier includes $50 in audio credits
What to know first
- Free tier limits streaming connections and concurrent transcriptions
- Universal-3.6 Pro Realtime costs $0.45 per hour
- Universal-3.5 Pro supports 18 languages
Verdict
AssemblyAI offers a broad set of speech and language features through APIs, with managed and self-hosted deployment options. A free tier is available, while paid rates depend on the selected model and usage.
AssemblyAI plans and pricing
All plansCompared on transcription software
- Free plan
- Noassemblyai.com
- Languages supported
- 99 languagesassemblyai.com
- Speaker identification
- Yesassemblyai.com
- Timestamp support
- Yesassemblyai.com
- Export formats
- SRT, VTTassemblyai.com
- API access
- Yesassemblyai.com
Facts
- What it does
- AssemblyAI provides Voice AI models and APIs for speech-to-text, speech understanding, and voice applications.assemblyai.com · 1 Oct 2026
- Language coverage
- The platform states coverage across 99 languages and translation into 86 languages.assemblyai.com · 1 Oct 2026
- Scale
- AssemblyAI states that its platform processes more than 800 million API calls per month.assemblyai.com · 1 Oct 2026
- Latency
- AssemblyAI states sub-300ms latency for streaming and voice agents.assemblyai.com · 1 Oct 2026
- Security
- AssemblyAI offers TLS 1.2+ encryption in transit, AES-256 encryption at rest, zero data retention, and an opt-out from model training.assemblyai.com · 1 Oct 2026
- Compliance
- AssemblyAI maintains an annually audited SOC 2 Type 2 report and conducts annual third-party penetration tests.assemblyai.com · 1 Oct 2026
- Deployment
- Customers can run AssemblyAI in its managed cloud or self-host the models inside their own environment.assemblyai.com · 1 Oct 2026
- Billing
- Pay-as-you-go billing has no minimum commitments, upfront fees, contracts, or monthly subscription requirement, and invoices are generated monthly for prior usage.assemblyai.com · 1 Oct 2026
- Developer support
- AssemblyAI provides documentation, an API reference, cookbooks, support resources, a changelog, and a service-status page.assemblyai.com · 1 Oct 2026
- SDKs
- Official documentation provides Python and JavaScript SDK guidance.assemblyai.com · 1 Oct 2026
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Sources
- assemblyai.com/about· checked 1 Oct 2026
- assemblyai.com/features· checked 1 Oct 2026
- assemblyai.com/security· checked 1 Oct 2026
- assemblyai.com/pricing· checked 1 Oct 2026
- assemblyai.com· checked 1 Oct 2026
- assemblyai.com/docs/pre-recorded-audio/guides/do-more-· checked 1 Oct 2026
- support.assemblyai.com/articles/5370767329-can-i-sign-up-for-f· checked 20 Sept 2026
- assemblyai.com/pricing/· checked 20 Sept 2026