Rev AI: Features mature enterprise transcription APIs with long-standing industry reliability, though real-time streaming capabilities are more limited. AssemblyAI records 453,591 monthly visits with -6.9% month-over-month growth and Freemium, Contact for Pricing pricing. Rev AI records 50,708 monthly visits with -18.4% growth and Free Trial, Paid pricing.
Speech-to-text and voice intelligence APIs for developers
Developer-first speech-to-text API with industry-leading accuracy
| Dimension / Metric | | |
|---|---|---|
| Official Domain | assemblyai.com | rev.ai |
| Pricing Model | Freemium, Contact for Pricing | Free Trial, Paid |
| Monthly Visits | 453.59K (453,591) | 50.71K (50,708) |
| MoM Traffic Delta | -33.48K (-6.9%) | -11.42K (-18.4%) |
| Primary Market & Share | 🇧🇷 Brazil (30.6%) | 🇺🇸 United States (36.1%) |
| Direct Visits / mo | 281.47K | 22.44K |
| User Rating | 4.6 | 4.4 |
| Supported Platforms | Website | Website |
Speech-to-text and voice intelligence APIs for developers
Choose pre-recorded transcription for files, a realtime API for live streams and voice agents, or a synchronous endpoint for short clips and dictation.
Layer summarization, sentiment, topic detection, PII redaction, content moderation and guardrails onto transcripts without building your own models.
AssemblyAI-TTS-1 is trained on real phone calls for natural, low-latency speech, targeted at IVR and voice-agent use cases.
Flagship models emphasise exact transcription, speaker labels and native code-switching across many languages, supported by published benchmarks.
Developer-first speech-to-text API with industry-leading accuracy
Transcribe pre-recorded files in minutes or stream live audio through a real-time endpoint, with punctuation, casing, and formatting applied automatically.
Recognize speech across more than 57 languages and dialects, with benchmarked accuracy that the company reports as the best among major vendors.
Layer language identification, sentiment analysis, topic extraction, summarization, and translation on top of any transcript to turn audio into structured intelligence.
Generate exact word-level timing for media, subtitles, accessibility, and content indexing workflows.
SpecialistEnterprise developer platform and API for deploying GPT-6 Astra, Sol, Luna, and realtime multimodal agents.
SpecialistEnterprise developer platform and API for deploying GPT-6 Astra, Sol, Luna, and realtime multimodal agents.
AI teammate that records, transcribes and summarizes every meeting
AI teammate that records, transcribes and summarizes every meeting
AI transcription and meeting notes in 150+ languages
AI transcription and meeting notes in 150+ languages
SpecialistExcels at ultra-low latency text-to-speech generation, but focuses less on comprehensive asynchronous audio intelligence and summarization.
SpecialistExcels at ultra-low latency text-to-speech generation, but focuses less on comprehensive asynchronous audio intelligence and summarization.
AI and human transcription, captions and investigative case analysis in one platform
AI and human transcription, captions and investigative case analysis in one platform
Turn any video or audio into text in seconds
Real-time speech-to-text, text-to-speech and voice agents in one API platform
Real-time speech-to-text, text-to-speech and voice agents in one API platform
SpecialistSpecializes in orchestrating complete conversational voice agent pipelines rather than raw standalone transcription APIs.
AI transcription, translation and subtitles for audio and video
AI transcription, translation and subtitles for audio and video
One speech AI API for recognition, generation, and translation in 60+ languages
One speech AI API for recognition, generation, and translation in 60+ languages
Speech-to-text and audio intelligence API for production voice products
Speech-to-text and audio intelligence API for production voice products
Transcribe, analyze, and score every conversation against your own methodology
Transcribe, analyze, and score every conversation against your own methodology
