AssemblyAI vs iZotope
iZotope uniquely has 11 features · AssemblyAI uniquely has 9 features.
| AssemblyAI | iZotope | |
|---|---|---|
| Company | ||
| Founded | 2017 | 2001 |
| HQ | San Francisco, USA | Boston, Massachusetts, USA |
| AI model | Universal-3.5 Pro (Proprietary) | Proprietary ML (including Scene Rebalance, Stems View, and other iZotope AI models) |
| User base | Millions of developers | 1M+ (estimated across all products) |
| Platforms | Web, API (all platforms via SDK) | Windows, macOS (VST, VST3, AU, AAX plugin formats); no native web or mobile app |
| Languages | 99 (Universal-2), 18 (Universal-3.5 Pro) | English only (software UI) |
| Pricing | ||
| Free plan | Yes | No |
| Free trial | Yes-unlimited (free tier, no credit card required — up to 185 hours pre-recorded, 333 hours streaming) | Yes |
| Starting price | $0.15/hr | $15/mo |
| Enterprise | Custom pricing with custom rate limits, enhanced concurrency, and enterprise-grade flexibility | Custom — Enterprise and Education pricing available via contact |
| Refund policy | — | 30-day money-back guarantee (per published refund policy) |
| All plans | Free TierFreeUniversal-3.5 Pro$0.15/hrUniversal-3.5 Pro$0.21/hrEnterprise / CustomCustom | Izotope Plus$15/moIzotope Pro$25/moOzone 12 Elements$55.00 one-timeRX 12 Elements$99.00 one-timeElements Suite 12$149.00 one-timeOzone 12 Standard$219.00 one-timeNeutron 5$299.00 one-timeNectar 4 Advanced$299.00 one-timeRX 12 Standard$399.00 one-timeOzone 12 Advanced$499.00 one-timeMusic Production Suite 9$799.00 one-timeRX 12 Advanced$1,399.00 one-timeEverything Bundle$2,999.00 one-time |
| Positioning | ||
| Best for | Developers and enterprises building voice AI applications, transcription services, and voice agents | Music producers, audio engineers, post-production professionals, and mastering engineers needing advanced AI-assisted audio repair, mixing, and mastering tools |
| Differentiator | Native code switching and highly accurate speaker diarization; async speech-to-text trained on 12.5M+ hours of audio | iZotope combines proprietary machine learning (AI-assisted repair, mixing, and mastering) with professional-grade audio tools across the full production pipeline, from dialogue repair with RX to mastering with Ozone, making it uniquely comprehensive for both music and post-production workflows. |
| Competitors | Deepgram, OpenAI Whisper, Google Speech-to-Text, Amazon Transcribe, Rev.ai | Waves Audio, FabFilter, Cedar Audio, Accusonus, Adobe Audition (built-in tools), Acon Digital |
| Features | ||
| 100+ Tools (Pro) | — | ✓ |
| Always Up to Date | — | ✓ |
| Async Speech to Text | ✓ | — |
| Async Transcription | ✓ | — |
| Code Switching | ✓ | — |
| Member Exclusive Downloads | — | ✓ |
| Multi Language Support | ✓ | — |
| Nectar 4 Advanced (Pro) | — | ✓ |
| Ozone 12 Advanced (Pro) | — | ✓ |
| Rx 12 Standard (Pro) | — | ✓ |
| Speaker Diarization | ✓ | — |
| API Access | ✓ | ✕ |
| Audio Enhancement | ✕ | ✓ |
| Batch Processing | ✓ | ✓ |
| Commercial Rights | ✓ | ✓ |
| Languages Supported | ✓ | ✕ |
| Mobile App | ✕ | ✕ |
| Music Generation | ✕ | ✕ |
| Noise Removal | ✕ | ✓ |
| Podcast Editing | ✕ | ✓ |
| Text to Speech | ✕ | ✕ |
| Transcription | ✓ | ✕ |
| Voice Cloning | ✕ | ✕ |
| Voice Styles | ✕ | ✕ |
| Integrations | ||
| Adobe Audition | ✕ | ✓ |
| API Access | ✓ | ✕ |
| Garageband | ✕ | ✓ |
| Key Integrations | AWS Marketplace, GPT (LLM Gateway), Claude (LLM Gateway), Gemini (LLM Gateway), Community LLM Models, Python SDK, REST API, WebSocket Streaming API | Pro Tools (AAX), Logic Pro (AU), Ableton Live (VST/AU), Adobe Audition (VST/AAX), Reaper, Cubase, Studio One, FL Studio |
| Zapier | — | ✕ |