AssemblyAI vs ElevenLabs

Side-by-side comparison of features, pricing, and ratings

Analysis reviewed Live tool data as of 2026-09-29
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At a glance

DimensionAssemblyAIElevenLabs
Best forSpeech-to-text APIs and voice agents for developersUltra-realistic TTS, dubbing, music, and voice agents
Key differentiatorHigh-accuracy STT with real-time Context CarryoverExpressive voice generation + creative audio tools
Languages99 for STT (Universal-2), 18 for Universal-3.5 Pro70+ for TTS
ApproachDeveloper-first speech understanding platformBroad: voice, music, SFX, dubbing, agents
Integration spotlightPipecat, ElevenLabs, LiveKit, LLMsTwilio, WhatsApp, Salesforce, Meta

If you need lifelike voice generation for content or voice agents, ElevenLabs is the pick — it excels at TTS, dubbing, and audio creation. If your core need is accurate speech-to-text and building voice AI products, AssemblyAI's APIs are what you want — especially with Universal-3.5 Pro's human-parity accuracy. Choose based on your primary input (text-to-speech vs. speech-to-text) and whether you prefer a broad creative suite or a focused developer platform.

Try AssemblyAITry ElevenLabs
AssemblyAI
AssemblyAI

Voice AI infrastructure for developers: speech-to-text, speech understanding, guardrails, and LLM routing on one API key.

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ElevenLabs
ElevenLabs

ElevenLabs turns text, audio and images into speech, music, dubbing and conversational agents, all billed from one shared credit pool.

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Pricing
Freemium
Freemium
Plans
$0
$0.21/hr
Custom
$0/mo
$6/mo
$22/mo (monthly billing); $18.33/mo billed annually; $11 for
$99/mo (monthly billing); $82.50/mo billed annually
$299/mo (monthly billing); $249.17/mo billed annually
$990/mo (monthly billing); $825/mo billed annually
Custom
Popularity
5.6k views
5.9k views
Skill Level
Advanced
Beginner-friendly
API Available
Platforms
API
WebMobileAPICLI
Categories
✨ Transcription & Speech-to-Text🎙️ Voice & Speech☎️ Voice AI Agents & Phone Automation
🎙️ Voice & Speech✨ Music Generation☎️ Voice AI Agents & Phone Automation🎚️ Audio Editing & Production
Features
Pre-recorded Speech-to-Text API across 99 languages
Realtime Speech-to-Text over WebSocket at roughly 150ms p50 latency
Sync Speech-to-Text API returning a transcript in one HTTP request
Sync API handles short clips up to 120 seconds with no polling
Dictation API that strips filler words and resolves self-corrections
Voice Agent API with managed STT, LLM reasoning, and TTS in one connection
Voice Agent API at roughly one second end-to-end latency
Speech Understanding API for summarization, sentiment, and topic detection
Guardrails API for PII handling and content moderation
LLM Gateway giving unified access to frontier language models
Universal-3.5 Pro model with native code-switching in 18 languages
Speaker diarization and word-level timestamps
Keyterms prompting and custom spelling for domain vocabulary
Python and TypeScript SDKs plus raw HTTP and WebSocket APIs
AssemblyAI MCP Server for Claude Code, Cursor, and MCP-compatible agents
Text to Speech in 70+ languages (90+ on Eleven v4) with controllable, expressive delivery
Eleven v4 synthesis model with a 10,000-character limit and multi-speaker dialogue
Eleven v4 Turbo with median inference latency around 100ms for real-time use
Eleven Flash v2.5 at roughly 75ms latency, cited for conversational agents
Eleven Multilingual v2 for stable, lifelike long-form narration across 29 languages
Instant Voice Cloning from audio samples (Starter and above)
Professional Voice Cloning (Creator and above)
Voice Design: generate a voice from a text prompt
Library of 10,000+ ready-made voices
Speech to Text via Scribe v2 in 90+ languages with keyterm prompting up to 1,000 terms
Scribe v2 speaker diarization up to 32 speakers and word-level timestamps
Scribe v2 Realtime transcription at roughly 150ms latency
Scribe v2 Medical variant for clinical audio, claiming 35% fewer clinical errors
Music generation from natural-language prompts, with Music v2.5 API support
Custom sound effects, soundscapes and a searchable SFX library
Integrations
LiveKit
Pipecat
Twilio
Langflow
ElevenLabs
Zoom

What real users say: AssemblyAI vs ElevenLabs

Not marketing copy and not our opinion — a structured sweep of public discussion (reviews, forums, communities and video comments), showing what people praise and what they complain about for each tool.

AssemblyAI

76 mentions across 5 sources · 73% positive (averaged across 5 sources)

Hacker News, YouTube, Product Hunt, Bluesky, Lemmy

What users praise

  • • Streaming model with Context Carryover improves real-time conversation understanding.
  • • Unified API stack: STT, Speech Understanding, Guardrails, LLM Gateway, Voice Agent.
  • • Low-latency real-time WebSocket streaming praised for voice agent use cases.
  • • No concurrency limits or throttles on pay-as-you-go plans.

What frustrates them

  • • Speechmatics and Deepgram sometimes faster for real-time streaming.
  • • Top accuracy model covers only 18 languages, limiting global use.
  • • Limited free tier may discourage hobbyist experimentation.
  • • Community buzz is niche; less mainstream adoption than competitors.

Researched Jul 25, 2026

ElevenLabs

108 mentions across 7 sources · 56% positive — mixed (averaged across 7 sources)

Hacker News, YouTube, Product Hunt, App Store, Stack Overflow, GitHub, Lemmy

What users praise

  • • Most realistic and expressive AI voice quality in the industry.
  • • 70+ language support with natural-sounding accents and emotions.
  • • Low-latency API: Eleven Flash at ~75ms, great for real-time apps.
  • • Scribe v2 transcription earns top marks for accuracy and diarization.

What frustrates them

  • • Credit system is confusing and goes fast with long content.
  • • Pricing is expensive compared to alternatives like Play.ht.
  • • Support is nearly nonexistent for non-enterprise users.
  • • SDK missing features like stitching and streaming input in JS.

Researched Aug 18, 2026

Who should pick which

  • Content creator (podcast/audiobook)
    Pick: ElevenLabs

    Lifelike TTS in 70+ languages, voice cloning, and expressive controls are built for audio production.

  • Developer building a voice agent
    Pick: AssemblyAI

    Voice Agent API with built-in turn detection, telephony integration, and HTTP Tool Calling makes deployment straightforward.

  • Enterprise doing customer support automation
    Pick: ElevenLabs

    Omnichannel agents (phone, WhatsApp, email) and integrations with Twilio/Salesforce suit large-scale deployments.

  • AI scribe / notetaker startup
    Pick: AssemblyAI

    Real-time stream with Context Carryover and human-parity accuracy on Coval benchmark ensures reliable meeting transcription.

  • Indie game developer
    Pick: ElevenLabs

    Expressive character voices and a huge voice library — plus music/SFX generation — cover audio assets in one place.

Frequently Asked Questions

AssemblyAI vs ElevenLabs: which should you choose?

If you need lifelike voice generation for content or voice agents, ElevenLabs is the pick — it excels at TTS, dubbing, and audio creation. If your core need is accurate speech-to-text and building voice AI products, AssemblyAI's APIs are what you want — especially with Universal-3.5 Pro's human-parity accuracy. Choose based on your primary input (text-to-speech vs. speech-to-text) and whether you prefer a broad creative suite or a focused developer platform.

Which has better accuracy for speech-to-text?

AssemblyAI's Universal-3.5 Pro Realtime is the only model in Coval's Human Parity Zone, so it leads on accuracy benchmarks. ElevenLabs' Scribe is decent (98%) but not positioned as a research-grade STT.

Can both handle real-time audio?

Yes. ElevenLabs offers low-latency TTS (Flash ~75ms) for voice agents; AssemblyAI offers real-time streaming STT with Context Carryover for live transcription.

Which is better for creating music and sound effects?

ElevenLabs — it has dedicated music generation, SFX, and even video generation via Veo/Wan/Kling, which AssemblyAI doesn't offer.

Do they support multiple languages?

ElevenLabs TTS supports 70+ languages; AssemblyAI STT supports 99 languages (Universal-2) and 18 for the highest-accuracy Pro model. Your choice depends on input vs. output language needs.

Can I use both in a single product?

Absolutely — AssemblyAI even lists ElevenLabs as a TTS integration for its Voice Agent API. Many teams pair AssemblyAI for STT and ElevenLabs for TTS.

Which offers watermarking for AI-generated audio?

ElevenLabs uses Google's SynthID for detection and watermarking — a feature AssemblyAI doesn't advertise.

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Explore each tool further

AssemblyAI
View AssemblyAI reviewAssemblyAI alternatives
ElevenLabs
View ElevenLabs reviewElevenLabs alternatives

Browse these categories

Best AI Transcription & Speech-to-Text toolsBest AI Voice & Speech toolsBest AI Music Generation toolsBest AI Voice AI Agents & Phone Automation tools
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Last reviewed: August 3, 2026