# YC Winter 2026 companies

Canonical: https://thelazyweb.com/yc/winter-2026/
Author: Ali Abouelatta
Published: 2026-09-19
Updated: 2026-09-19

A selected Winter 2026 YC company sample organized for founders comparing adjacent products, buyers, and public evidence.

## [/dev/fast](https://thelazyweb.com/companies/dev-fast/)

Open-source code review for understanding architecture, diffs, and agent trajectories.

Industry: B2B

## [Constellation Space](https://thelazyweb.com/companies/constellation-space/)

Constellation Space provides a telemetry, forecasting and policy-controlled action layer for mixed-vendor satellite fleets.

Industry: B2B; Analytics

## [21st](https://thelazyweb.com/companies/21st/)

21st.dev pairs a large React component registry with an Agents SDK for shipping persistent frontier-agent experiences to users.

Industry: Developer Tools; Artificial Intelligence; Frontend Infrastructure

## [Balance](https://thelazyweb.com/companies/balance/)

Balance keeps SMB books current with AI agents and named accountants who own the judgement and sign-off.

Industry: B2B; Finance and Accounting

## [Autumn AI](https://thelazyweb.com/companies/autumn-ai/)

A live public-web research and enrichment layer for teams that need changing signals and provenance rather than static database rows.

Industry: B2B · Infrastructure

## [AutoSitu](https://thelazyweb.com/companies/autositu/)

The AI operating system for the built world

Industry: Real Estate / Construction

## [Sitefire](https://thelazyweb.com/companies/sitefire/)

AI-search visibility, content, citation, and referral analytics for marketing teams.

[YC Winter 2026 companies](<https://www.thelazyweb.com/yc/winter-2026/>)

Source observed: 2026-09-20T06:38:32.097Z. Last checked: 2026-10-08T02:08:48.783+00:00.

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