AssemblyAI vs ElevenLabs
Side-by-side comparison of features, pricing, and ratings
At a glance
| Dimension | AssemblyAI | ElevenLabs |
|---|---|---|
| Pricing | Freemium, 100-min free trial, pay-as-you-go from $0.15/hr | Freemium, paid plans start around $5/mo |
| Best for | Speech-to-text APIs and voice agents for developers | Ultra-realistic TTS, dubbing, music, and voice agents |
| Key differentiator | High-accuracy STT with real-time Context Carryover | Expressive voice generation + creative audio tools |
| Languages | 99 for STT (Universal-2), 18 for Universal-3.5 Pro | 70+ for TTS |
| Approach | Developer-first speech understanding platform | Broad: voice, music, SFX, dubbing, agents |
| Integration spotlight | Pipecat, ElevenLabs, LiveKit, LLMs | Twilio, 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.
Feature-by-feature
These tools overlap in voice agents but shine in different areas. ElevenLabs is a creative powerhouse: TTS in 70+ languages with expressive control, 10,000+ voices, voice cloning, music and SFX generation, even image/video via Veo and Kling. Its ElevenAgents handle omnichannel conversations (phone, chat, email, WhatsApp) and low-latency Flash TTS (~75ms) makes it ideal for real-time interactions. Recent updates added Procedure APIs and knowledge-base RAG — so agents can now execute multi-step workflows and answer from custom data. AssemblyAI is laser-focused on speech understanding: its Universal-3.5 Pro Realtime is the only model in Coval's Human Parity Zone, and the new Sync API returns a transcript in a single call with ~134ms latency — perfect for dictation or IVR. It also offers Guardrails (PII redaction, moderation), an LLM Gateway (routing across GPT, Claude, Gemini with fallback), and Keyterms Prompting for domain-specific accuracy. ElevenLabs now includes Scribe for STT (98% accuracy) but doesn't match AssemblyAI's depth in STT features like speaker ID, sentiment, chapters, and summaries. AssemblyAI's Voice Agent API has built-in turn detection and interruption handling, plus HTTP Tool Calling — no proxy needed. If your product hinges on transcription accuracy, choose AssemblyAI; if it hinges on generated voice quality and creative audio, choose ElevenLabs.
Pricing compared
Both are freemium with different value props. ElevenLabs' free tier lets you test TTS but credits run out fast — its paid plans scale by characters and features, aimed at creators and enterprises that need volume. AssemblyAI gives 100 minutes free, then pay-as-you-go: $0.15/hr for Universal-2, $0.21/hr for Universal-3.5 Pro. That's a clear per-hour cost you can predict. ElevenLabs' pricing is more opaque — it depends on character usage and which features you enable (e.g., dubbing, music). For a developer, AssemblyAI's transparent per-hour model is easier to budget. For a content creator who needs high-volume voice generation, ElevenLabs' tiers likely make more sense despite the complexity. Watch for AssemblyAI's upcoming change: default async model switches to Universal-3.5 Pro on August 7, 2026 — pin to Universal-2 if you want to keep costs at $0.15/hr.
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 agentPick: AssemblyAI
Voice Agent API with built-in turn detection, telephony integration, and HTTP Tool Calling makes deployment straightforward.
- Enterprise doing customer support automationPick: ElevenLabs
Omnichannel agents (phone, WhatsApp, email) and integrations with Twilio/Salesforce suit large-scale deployments.
- AI scribe / notetaker startupPick: AssemblyAI
Real-time stream with Context Carryover and human-parity accuracy on Coval benchmark ensures reliable meeting transcription.
- Indie game developerPick: 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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Last reviewed: August 3, 2026