Blacksmith

The fastest way to run your GitHub Actions. Trusted by @supabase, @trychroma, @clerk and 1000+ others.

[Blacksmith @useblacksmith]

We’ve raised our $10M Series A, led by Google Ventures.

Meet Blacksmith.

[筋と憎悪，もののけ王 @ubugeeei]

https://t.co/Ino6AixAKH の CI が本当に 2 倍早くなった．
ありがとう @useblacksmith

Before: 8m 45s
After: 4m 26s

[Blacksmith @useblacksmith]

spotted in SF doing free advertising for the tire shop

[Aditya Jayaprakash @adijayaprakash]

Blacksmith is part of @Redpoint's 2026 InfraRed 100 today.

We started Blacksmith because CI needed its own cloud. Just over two years later, we're running millions of CI jobs every day for some of the fastest-growing companies.

The same primitives we built to power CI will power much more than just CI.

There’s a lot more coming :)

[Blacksmith @useblacksmith]

Blacksmith has been named to @Redpoint's 2026 InfraRed 100!

We're building developer infrastructure to help devs (and agents) move faster.

https://t.co/6CJVNXU1xY

[Blacksmith @useblacksmith]

@jishnuteegala @theo @clerk Thank you 💛💛

[Blacksmith @useblacksmith]

4x faster CI. observability that actually works.

@theo on moving CI to blacksmith.

[Blacksmith @useblacksmith]

very cool build🦞

[Peter Steinberger 🦞 @steipete]

Built BlackBar, a menubar for @useblacksmith https://t.co/LAAyHy8aDQ

[Blacksmith @useblacksmith]

3.7M jobs and $511K in compute, nbd

[Peter Steinberger 🦞 @steipete]

And people think tokens are expensive... this is @useblacksmith (they sponsor OpenClaw, 🫶🦞)

[Blacksmith @useblacksmith]

We got rid of the most mind-numbing step in CI.

With Container Caching, you no longer need to spend time pulling your images from your registry since they're already loaded at the start of every job.

Minutes back on every run, now available on Blacksmith.

[Aayush Shah @aayush_shah15]

another underrated testbox use case: get agents to stress a flaky test across a dozen blacksmith VMs in parallel and let them hammer away until the cause is understood and deflaked.

latest coding models are great at this kind of long-horizon work

[Blacksmith @useblacksmith]

Cached.
Loaded.
Shipping soon.

[Blacksmith @useblacksmith]

Wrote about how we managed to pull it off: https://t.co/Xc6DymG1eo

[Blacksmith @useblacksmith]

One of the most fun projects we've shipped to date was reverse engineering github actions cache to make it up to 10x faster

[Peter Steinberger 🦞 @steipete]

Did some work to get our CI times down from 8 to two minutes via some... parallelization. Kudos to the @useblacksmith folks for sponsoring + letting us melt their servers.

[Blacksmith @useblacksmith]

(we didn't pay for this post we just really like when people write about us)

[Blacksmith @useblacksmith]

@_howardjohn switched to Blacksmith and his E2E tests went from 10 min to 2

https://t.co/5sNZ09SPKR

[Blacksmith @useblacksmith]

@gajesh Hey Gajesh! This step just grants access to your email so we can log you in. Later on you can pick which specific repos you want to grant us access to as you onboard, feel free to DM if you get blocked

[Blacksmith @useblacksmith]

Blacksmith Mac Runners are here.

M4 Pro chips. Local NVMe storage. 2-4x faster builds vs. GitHub-hosted runners.

If you're building for Apple, your CI just got a serious upgrade.

[Blacksmith @useblacksmith]

Congrats to @FactoryAI on their Series C! Stoked to keep building with you 🏭

[Matan Grinberg @matanSF]

https://t.co/OGzWHkbs1R

[Aditya Jayaprakash @adijayaprakash]

We've been getting asked about Mac runners a bunch. Today they're live on Blacksmith.

Funny timing: one of our customers ran on Cirrus, which got acquired by OpenAI and shut down last week. We already had runners in production and got them migrated on the same day.

[Blacksmith @useblacksmith]

Read about how we shipped this in 3 weeks: https://t.co/MLEXuTCKso

[Blacksmith @useblacksmith]

2-4x faster builds across the board, almost here