Sindarin

Sindarin is a voice AI infrastructure company focused on making spoken interactions with AI feel natural rather than robotic. Developers configure conversational characters — called 'Personas' — either through Sindarin's web platform (no-code) or directly in their codebase via the API. The platform's headline differentiators are very low end-to-end latency (described as 'instant responses'), proprietary turn-taking that knows when the user is actually done speaking versus pausing mid-thought, and seamless interruption handling so a user can cut the agent off without losing context. The audience is teams building voice-first products: hedge funds, wellness apps, customer support, and consumer AI assistants. The site features endorsements from Matt Shumer (HyperWrite AI) and investors at Untapped Capital and Interface Capital. Sindarin offers granular pricing (per-minute / per-character / per-feature rather than a single flat plan) and a free tier to get started. Because pricing details depend on volume and selected features, exact numbers should be verified on the pricing page before quoting customers.