# Accelerator WebMCP observations Canonical: https://www.lazyweb.com/directory/webmcp/accelerators-2026-09-20 Updated: 2026-09-20 Native WebMCP census · September 20, 2026 23 roster entries exposed native tools in at least one of two browser configurations. Every entry links to its dated evidence; all 1752 attempted rows remain in the dataset. | Context | Assessable | Observed | Unknown | Access-limited | | --- | ---: | ---: | ---: | ---: | | Default Chrome | 1661 | 4 | 90 | 1 | | Experimental features enabled | 1661 | 23 | 90 | 1 | - [Ambiguous AI](https://www.lazyweb.com/directory/webmcp/accelerators-2026-09-20/speedrun-10d7704d-ca38-42b8-b227-64be0d802203): a16z Speedrun · SR005; default: Not observed in this window; experimental: Registration observed. - [Pen.dev](https://www.lazyweb.com/directory/webmcp/accelerators-2026-09-20/speedrun-70f8efdb-0078-4960-9e74-9cf4393d610b): a16z Speedrun · SR005; default: Not observed in this window; experimental: Registration observed. - [Lazyweb](https://www.lazyweb.com/directory/webmcp/accelerators-2026-09-20/speedrun-7f9e40cb-40e2-4726-94fc-0cf75f0d2349): a16z Speedrun · SR007; default: Not observed in this window; experimental: Registration observed. - [Vespper](https://www.lazyweb.com/directory/webmcp/accelerators-2026-09-20/yc-30043): Y Combinator · Fall 2024; default: Not observed in this window; experimental: Registration observed. - [Gecko Security](https://www.lazyweb.com/directory/webmcp/accelerators-2026-09-20/yc-30087): Y Combinator · Fall 2024; default: Not observed in this window; experimental: Registration observed. - [Confident AI](https://www.lazyweb.com/directory/webmcp/accelerators-2026-09-20/yc-30283): Y Combinator · Winter 2025; default: Not observed in this window; experimental: Registration observed. - [CopyCat AI](https://www.lazyweb.com/directory/webmcp/accelerators-2026-09-20/yc-30338): Y Combinator · Winter 2025; default: Not observed in this window; experimental: Registration observed. - [assistant-ui](https://www.lazyweb.com/directory/webmcp/accelerators-2026-09-20/yc-30355): Y Combinator · Winter 2025; default: Registration observed; experimental: Registration observed. - [MindFort](https://www.lazyweb.com/directory/webmcp/accelerators-2026-09-20/yc-30527): Y Combinator · Spring 2025; default: Not observed in this window; experimental: Registration observed. - [Dedalus Labs](https://www.lazyweb.com/directory/webmcp/accelerators-2026-09-20/yc-30605): Y Combinator · Summer 2025; default: Not observed in this window; experimental: Registration observed. - [Button Computer](https://www.lazyweb.com/directory/webmcp/accelerators-2026-09-20/yc-30770): Y Combinator · Winter 2026; default: Registration observed; experimental: Registration observed. - [Didit](https://www.lazyweb.com/directory/webmcp/accelerators-2026-09-20/yc-31080): Y Combinator · Winter 2026; default: Not observed in this window; experimental: Registration observed. - [21st](https://www.lazyweb.com/directory/webmcp/accelerators-2026-09-20/yc-31123): Y Combinator · Winter 2026; default: Not observed in this window; experimental: Registration observed. - [Pocket](https://www.lazyweb.com/directory/webmcp/accelerators-2026-09-20/yc-31214): Y Combinator · Winter 2026; default: Registration observed; experimental: Registration observed. - [Superset](https://www.lazyweb.com/directory/webmcp/accelerators-2026-09-20/yc-31222): Y Combinator · Spring 2026; default: Not observed in this window; experimental: Registration observed. - [primitive](https://www.lazyweb.com/directory/webmcp/accelerators-2026-09-20/yc-31329): Y Combinator · Spring 2026; default: Not observed in this window; experimental: Registration observed. - [Nine Fives](https://www.lazyweb.com/directory/webmcp/accelerators-2026-09-20/yc-31366): Y Combinator · Spring 2026; default: Registration observed; experimental: Registration observed. - [Kinro](https://www.lazyweb.com/directory/webmcp/accelerators-2026-09-20/yc-31382): Y Combinator · Spring 2026; default: Not observed in this window; experimental: Registration observed. - [Taiga](https://www.lazyweb.com/directory/webmcp/accelerators-2026-09-20/yc-31418): Y Combinator · Spring 2026; default: Not observed in this window; experimental: Registration observed. - [Tasklet](https://www.lazyweb.com/directory/webmcp/accelerators-2026-09-20/yc-31470): Y Combinator · Spring 2026; default: Not observed in this window; experimental: Registration observed. - [KugelAudio](https://www.lazyweb.com/directory/webmcp/accelerators-2026-09-20/yc-31540): Y Combinator · Spring 2026; default: Not observed in this window; experimental: Registration observed. - [Speko](https://www.lazyweb.com/directory/webmcp/accelerators-2026-09-20/yc-32169): Y Combinator · Summer 2026; default: Not observed in this window; experimental: Registration observed. - [Context.dev](https://www.lazyweb.com/directory/webmcp/accelerators-2026-09-20/yc-32227): Y Combinator · Summer 2026; default: Not observed in this window; experimental: Registration observed. Passive homepage observation only. No tool was invoked. Registration does not establish execution, product quality, task success or adoption. A tool absent from one window may appear in another context. I co-founded Lazyweb, one of the SR007 entries. It was observed through the same public procedure. [Census directory](https://www.lazyweb.com/directory/webmcp/accelerators-2026-09-20) · [Study and methods](https://www.lazyweb.com/agent-readiness/measure-agent-distribution-without-counting-registrations) · [All row-level data](https://www.lazyweb.com/datasets/native-webmcp-census-2026-09-20.json) · [Archived WebMCP directory](https://www.lazyweb.com/webmcp)