AssemblyAI vs Rev AI
AssemblyAI
assemblyai.com
Rev AI
rev.aiSide by side
| Figure | AssemblyAI | Rev AI |
|---|---|---|
| Price from | $0.15/mo | $0.01/mo |
| Free plan | Yes | Yes |
| Free trial | — | Yes |
| Open source | — | — |
| Web | Yes | Yes |
| iOS | — | Yes |
| Android | — | Yes |
| API | Yes | Yes |
| Self-hosted | Yes | Yes |
| Plans published | 13 | 21 |
| Spec score · Transcription Software | 8.8 (#8) | 8.9 (#7) |
| Spec score · Speech Recognition Software | 8.8 (#8) | 8.9 (#6) |
| Spec score · AI transcription tools | 8.7 (#13) | 9.3 (#4) |
| Spec score · Audio Transcription Software | 8.8 (#10) | 8.9 (#9) |
| Spec score · Speech-to-Text Software | 8.8 (#10) | 8.9 (#8) |
| API access | Yes | Yes |
| Compliance | AssemblyAI maintains an annually audited SOC 2 Type 2 report and conducts annual third-party penetration tests. | Rev lists CJIS, HIPAA and SOC 2 Type II compliance and provides a SOC 3 report for review. |
| Export formats | SRT,VTT | TXT,JSON,SRT,VTT |
| Free plan | No | No |
| Integrations | Official integrations include LiveKit, Pipecat, OpenRouter, Zapier, Make, n8n, Postman, Recall.ai, Zoom RTMS, Telnyx, Twilio, Amazon Connect, Genesys Cloud, LangChain, Vercel AI SDK, Power Automate, Semantic Kernel, Cloudflare, Bubble, Pipedream, and Drupal. | Rev lists integrations with YouTube, Vimeo, JW Player, Brightcove, Panopto, Zoom, Kaltura, Ensemble, WarpWire and Dropbox. |
| Languages supported | 99 | 1 |
| Language coverage | The platform states coverage across 99 languages and translation into 86 languages. | Rev advertises support for more than 57 languages, with capabilities varying by language. |
| Speaker identification | Yes | Yes |
| Timestamp support | Yes | Yes |
| What it does | AssemblyAI provides Voice AI models and APIs for speech-to-text, speech understanding, and voice applications. | Rev AI provides APIs for asynchronous and real-time speech-to-text transcription plus speech insights. |
Plans
AssemblyAI
- Free creditsFree
- Pay as you go — Universal-2$0.15 a month
- Pay as you go — Universal-3.5 Pro$0.21 a month
- Pay as you go — Universal-Streaming$0.15 a month
- Pay as you go — Universal-3.5 Pro Realtime$0.45 a month
- Free tierFree
- Universal-2$0.15 a month
- Universal-Streaming$0.15 a month
- Universal-Streaming Multilingual$0.15 a month
- Universal-3.5 Pro$0.21 a month
Rev AI
- Whisper Fusion Transcription$0.01 a month
- Whisper Large Transcription$0.01 a month
- Reverb turbo transcriptionPrice not published
- Reverb Transcription$0.20 a month
- Reverb Foreign Language Transcription$0.30 a month
- Human Transcription$1.99 a month
- Forced AlignmentFree
- Language IdentificationFree
- Language Translation - Standard ModelFree
- Forced AlignmentFree
In their own words
AssemblyAI
AssemblyAI provides Voice AI models and APIs for speech-to-text, speech understanding, and voice applications. Its Speech Understanding API can identify and diarize speakers, summarize speech, extract action items and key phrases, detect sentiment, entities, and topics, and handle formatting, language detection, translation, PII redaction, and content moderation. The platform lists support for 99 languages and translation into 86. It offers streaming and voice-agent latency below 300ms and states that it processes more than 800 million API calls per month. Use its managed cloud or self-host models in your own environment; the service also lists API access and integrations including Twilio, Zoom RTMS, Zapier, and LangChain. Security options include TLS 1.2+ in transit, AES-256 at rest, zero data retention, and opting out of model training. A free tier is available. Pay-as-you-go billing is based on usage, with monthly invoices and no minimum commitments. Universal-2 is listed at $0.15 per hour of audio; Universal-3.6 Pro Realtime is $0.45 per hour.