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tailscaleWhat its open source looked like when it raised

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Website
tailscale.com
Repository
tailscale/tailscale
First commit
Stars today
35,945
Forks
3,146

The round

Series C announced 8 Apr 2025

$160M
Accel
Source: company announcement, tailscale.com

The repository was 62 months old on the day the round was announced.

Monthly reconstruction

GitHub stars, 1 Feb 2020 – 1 Jul 2026

78 observations · one per month

5,68011,37017,05022,730 8 Apr 2025 — round announced 21,683 25,488 Mar ’20Jun ’20Sep ’20Dec ’20Mar ’21Jun ’21Sep ’21Dec ’21Mar ’22Jun ’22Sep ’22Dec ’22Mar ’23Jun ’23Sep ’23Dec ’23Mar ’24Jun ’24Sep ’24Dec ’24Mar ’25Jun ’25Sep ’25Dec ’25Mar ’26Jun ’26
Stars, reconstructed month by month Funding announcement

What the curve says

Growth was faster before the announcement

In the 365 days to 1 Apr 2025 the repository added 5,544 stars. In the 365 days after, it added 3,656 — a rate 1.5× lower.

21,683
stars on 1 Apr 2025, the last reading before the round
15.2/day
1 Apr 2024 – 1 Apr 2025, before
10.0/day
1 Apr 2025 – 1 Apr 2026, after

What this does not show

  • Stars measure attention, not revenue, adoption or retention.
  • Each point is a month-end reading reconstructed from public event data, not a direct observation. Movement inside a month is invisible here, and the level can be understated.
  • A single launch post can produce a step like this without any change in usage.

We have been recording tailscale/tailscale since 1 Feb 2020.

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