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AssemblyAI vs Stable Audio

A feature-by-feature comparison of AssemblyAI and Stable Audio across 7 capability categories.

Try AssemblyAI (opens in a new tab)
Try Stable Audio (opens in a new tab)

Modalities — Tie

Modalities: AssemblyAI compared with Stable Audio
FeatureAssemblyAIStable Audio
Text Input
Partial. Prompts steer Speech Understanding. Primary input is audio.Yes, requires plus plan. Text prompts drive music and SFX generation.
Image Upload / Vision
No. Speech platform, not vision.No. Audio product, not vision.
Image Generation
No. Does not generate images.No. Distinct from Stable Diffusion image models.
Voice Mode
Yes, requires plus plan. Voice Agent WebSocket is a conversational speech product.No. Music/SFX generation, not a voice chat assistant.
Video Understanding
No. Audio/speech focus.No. Not a video product.
Video Generation
No. Not a video generation product.No. Not a video generation product.
File Upload (PDF, DOCX)
Partial. Upload audio/video files for async transcription.Partial. Audio-to-audio workflows accept reference audio.
Code Execution
No. STT APIs, not a code sandbox.No. Not a code sandbox.
Audio Input
Yes, requires plus plan. Realtime and batch STT are the core product.Yes, requires plus plan. Audio-to-audio transformation is a listed capability.
Canvas / Artifact Editor
No. Not a canvas product.No. Audio timeline in DAW, not a text canvas.
Screen Sharing / Computer Use
No. No computer-use product.No. No computer-use product.

Memory & Context — AssemblyAI Wins

Memory & Context: AssemblyAI compared with Stable Audio
FeatureAssemblyAIStable Audio
Persistent Memory
Partial. Voice Agent retains session context during a call.No. Generations are jobs, not persistent chat memory.
Large Context Window
Unknown. Agent context limits were not checked.No. Not an LLM chat product.
Custom Instructions
Yes, requires plus plan. Configure Voice Agent prompts and guardrails.Partial. Prompt and style controls per generation.
Conversation History
Partial. Transcripts stored per job. Realtime is per-session.Partial. Web app may show past generations. API is per-call.

Integrations — AssemblyAI Wins

Integrations: AssemblyAI compared with Stable Audio
FeatureAssemblyAIStable Audio
Web Search / Browsing
Unknown. Web search in Voice Agent was not confirmed.No. Not a search product.
Plugins / Extensions
Partial. LLM Gateway and integrations connect upstream models.Partial. DAW plugin integrates into production workflows.
API Access
Yes, requires plus plan. REST and WebSocket APIs for STT and Voice Agent.Yes, requires plus plan. Stable Audio API for music/SFX generation.
Zapier Integration
Unknown. Zapier listing was not checked.Unknown. Zapier was not checked.
Custom GPTs / Bots
Yes, requires plus plan. Voice Agent is a deployable speech bot.No. Not a bot platform.
Real-time Collaboration
No. No multiplayer product.No. No multiplayer editing advertised.
Live Social Data Integration
No. No social firehose.No. No social firehose.
Live Citation Mapping
No. Not a cited-search product.No. Not a search product.

Developer — AssemblyAI Wins

Developer: AssemblyAI compared with Stable Audio
FeatureAssemblyAIStable Audio
Function Calling
Partial. Voice Agent can call tools via LLM Gateway.No. Not an LLM with tools.
Streaming Responses
Yes, requires plus plan. Realtime STT streams partial transcripts over WebSocket.Partial. Generation may stream audio output in the web app.
Fine-Tuning
Unknown. Custom STT was not confirmed on homepage.Partial. Community LoRA mentioned; not a first-party fine-tune SKU.
Embeddings API
No. Not an embeddings product.No. Not an embeddings product.
Structured Output (JSON)
Partial. Speech Understanding returns structured entities and summaries.No. Outputs audio files, not JSON schemas.
Reasoning / Thinking Mode
No. Not a reasoning LLM.No. Not a reasoning LLM.
Local Execution
No. Cloud-only STT. Distinct from self-hosted Whisper.Partial. Community ONNX CPU inference mentioned; hosted API is cloud.
Open Weights
No. Proprietary models and APIs.Partial. Some open/community weights exist; flagship models are Stability-hosted.
Multi-Agent Orchestration
No. Single voice agent per session.No. Not an agent platform.

Platforms — Stable Audio Wins

Platforms: AssemblyAI compared with Stable Audio
FeatureAssemblyAIStable Audio
Web App
Partial. Dashboard for API keys and playground.Yes, requires plus plan. stableaudio.com web generator.
iOS App
No. No iOS app.Unknown. Mobile app was not checked.
Android App
No. No Android app.Unknown. Mobile app was not checked.
Desktop App
No. No desktop app.Partial. DAW plugin runs inside desktop audio software.
Chrome Extension
No. No Chrome extension.No. No Chrome extension.

Privacy — AssemblyAI Wins

Privacy: AssemblyAI compared with Stable Audio
FeatureAssemblyAIStable Audio
GDPR Compliant
Unknown. Compliance docs were not re-read.Unknown. Privacy policy was not re-read.
Opt Out of Data Training
Unknown. Training policy was not checked.Unknown. Training on uploads was not checked.
Enterprise Privacy Mode
Yes, requires enterprise plan. Guardrails, EU data residency options, and enterprise contracts.Unknown. Enterprise terms were not read.

Workspaces — Tie

Workspaces: AssemblyAI compared with Stable Audio
FeatureAssemblyAIStable Audio
Projects / Folders
Partial. Dashboard organizes API keys and usage.Partial. Web account may store generations.