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Companies / vercel

vercelWhat its open source is doing now

A drop-in replacement for react-markdown, designed for AI-powered streaming.

Website
streamdown.ai
Repository
vercel/streamdown
First commit
Stars today
5,570
Forks
291

The round

Series F announced 30 Sep 2025

$300M
Accel · GIC
Source: company announcement, vercel.com

The repository was 2 months old on the day the round was announced.

Measured by us

GitHub stars, 3 Feb 2026 – 30 Aug 2026

56 observations · every few days

4,4504,7705,0905,410 5,570 MarAprMayJunJulAug
Stars, observed directly by us

Where it is now

Running slower than its own average

Over the 30 days to 30 Aug 2026 the repository added 110 stars. Across the 208 days we have recorded it averages 6.2 a day, so the last month is running at 0.6× that.

5,570
stars on 30 Aug 2026
3.7/day
last 30 days
3.5/day
last 97 days

What this does not show

  • Stars measure attention, not revenue, adoption or retention.
  • The series starts on 3 Feb 2026, when we began observing this repository. Anything earlier survives only as a monthly reconstruction that does not join up with these readings, so it is not plotted.
  • The Series F above was announced on 30 Sep 2025, outside the window we measured, so this page makes no before-and-after claim about it.

We have been recording vercel/streamdown since 3 Feb 2026.

Finding companies at that stage is the product. Contributor pedigree, enterprise-demand signals and our ranking sit behind the login.

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