speaker-diarization
(3)
AssemblyAI
AssemblyAI is a San Francisco speech-AI company that builds and serves models turning audio and video into accurate text, plus higher-level 'audio intelligence' like summaries, sentiment, speaker labels, and PII redaction. Founded in 2017 by Dylan Fox, it sells a developer-first API used to add transcription, real-time streaming, and voice-agent capabilities to software. The company has raised more than $113M across seed to Series C and reports processing over a million hours of audio a day for customers ranging from startups to large enterprises.
Recall.ai
Recall.ai is a San Francisco developer-infrastructure company that sells a universal API for capturing meetings. Instead of building brittle bots for Zoom, Google Meet, Microsoft Teams, Webex, Slack Huddles and in-person calls, developers make a single API call and get back recordings, transcripts, and rich participant metadata. Founded by University of Waterloo dropouts David Gu and Amanda, the company pivoted from a consumer meeting app into the plumbing beneath a wave of AI notetakers and sales tools, and now powers thousands of companies. Recall.ai is Y Combinator-backed and raised a $38M Series B at a reported ~$250M valuation in September 2025.
SpeakIn Technologies Co.,Ltd.
SpeakIn Technologies is a voiceprint-recognition and identity-security company founded in Silicon Valley in 2015 and headquartered in Shenzhen. Using deep neural networks and its iVector engine, SpeakIn turns the unique physical signature of a human voice into a biometric key, offering both 1:1 verification (is this the right speaker?) and 1:N identification (who is speaking, out of many?). Its SDK and cloud APIs are used across banking, public security, and smart devices, with reported accuracy near 98% and customers including Tencent, Lenovo, ASUS, and China Merchants Bank.