The viral personal AI assistant you text or call
HQ: San Francisco, CA, United States | Founded: 2025 | Employees: Not disclosed (small team; ~5 per Tracxn 2025 snapshot) | Stage: Series B at $2.5B (Aug 2026) | Website: https://instinct.com
Instinct is the d/b/a of Spear Street Technology, Inc., a San Francisco company founded by Noah Shinn (23), a Northeastern University CS undergrad who dropped out in 2023 after co-authoring research in MIT's computational photochemistry group, then joined Sierra — Bret Taylor's enterprise AI-agent company — as one of its first employees and a research scientist. Shinn left Sierra in 2025 and built what reporters frame as an AI assistant 'founded last year' (2025); the California corporation was registered in April 2026. The product is a personal assistant you text or call (iMessage, WhatsApp, SMS, or phone) with no new interface to learn. Behind the chat sits a persistent per-user cloud computer with browser access and cached credentials; with user permission it can see screen contents, keyboard/cursor activity, ambient audio, and location. It connects to Google Workspace (Gmail, Calendar, Drive, Docs, Sheets, Tasks) via official APIs, and for services without APIs it reads screens, clicks, and fills forms. Payments go through Stripe and logins are secured via a 1Password integration. Instinct Mail (Sept 8, 2026) gives each agent its own email address and identity so it can create accounts, contact businesses, and follow up; a 'Vault' stores sensitive materials excluded from AI training. Under the hood, a proprietary 'core model' is trained for personal-life nuance on top of third-party LLMs, with the founder's research — Reflexion (NeurIPS 2023) on self-correcting agents and τ-bench (ICLR 2025) on agent reliability — widely cited as the intellectual foundation. The Terms of Service (revised Aug 26, 2026) allow use of 'Materials' for model training by default with a go-forward opt-out, and appoint Instinct as the user's agent to enter binding commitments; the original 'perpetual and irrevocable' license clause was removed in the same-day revision after the privacy backlash.
Instinct — operating as Spear Street Technology and founded by 23-year-old ex-Sierra researcher Noah Shinn — is the viral consumer AI agent of 2026: an invite-only personal assistant you reach by text or phone call that runs a persistent cloud computer holding your saved credentials, so it can book trips, buy groceries, cancel subscriptions, and run email on its own. Its wedge is zero-setup delegability, framed by investors as 'OpenClaw for normal people.' Funding is the headline: ~$350M total and a $2.5B post-money Series B co-led by Index Ventures and Benchmark on August 26, 2026 — roughly 5x its Series A mark weeks earlier, one of the fastest private-market re-ratings of the year. The risk is equally documented in its own launch week: broad device and account permissions, training on user materials by default (with a Vault carve-out), autonomous actions users did not request, and prompt-injection demonstrations — prompting a same-day terms rewrite and restricted autonomous operations. It is still free and invite-only, with no revenue, revenue model, or GA date disclosed.
Browse: Home | Blog | About | All Startups A-Z | View full profile on StartupWiki