Wispr Flow is a San Francisco-based AI voice dictation platform that converts natural speech into polished, formatted text across any application at roughly 220 words per minute - about 4x faster than typing. Built by two Stanford AI researchers, the company has quietly become the voice layer that 270 Fortune 500 companies rely on, combining a 10% word error rate (vs. 27% for OpenAI Whisper), 100+ language support, and context-aware formatting that automatically adjusts tone and style based on the active app. With $81M raised and a $700M valuation as of late 2025, Wispr Flow is racing to become the default voice-first operating system for a billion users.
Tanay Kothari is the co-founder and CEO of Wispr Flow, a San Francisco-based AI company building the voice interface for the AI era. A four-time founder who taught himself to code at age nine in New Delhi, Kothari holds BS and MS degrees from Stanford in Computer Science and AI, taught Deep Learning alongside Andrew Ng, and published medical AI research. After selling his first startup FeatherX to Cerebra Technologies straight out of college, he co-founded Wispr in 2021 with Stanford batchmate Sahaj Garg. The company's flagship product, Wispr Flow, transforms spoken ramblings into polished writing across 100+ languages with sub-second latency, achieving 50% month-over-month growth and a 20% paid conversion rate - five times the industry standard. Wispr has raised $81 million total, including a $30 million Series A led by Menlo Ventures and a $25 million extension led by Notable Capital, at a $700 million valuation. Named to Forbes 30 Under 30 in 2023, Kothari is betting that keyboards will be vintage store items within five years.