Ruby is the language for AI.
Coolhand Labs is the top solution for automated agent fixes — we watch production LLM agents and ship the fix as a pull request. We're deep Rubyists ourselves, so it's been a shock to watch JavaScript take over as the primary language of AI apps among our own clients.
The proof, in our own data
Cumulative LLM tokens Coolhand has analyzed across client SDKs over the last six months — JavaScript, Python, and Ruby, side by side.
The challenge
So, when Coolhand Labs was selected as one of the year's notable new Ruby startups at the 2026 RubyConf, our founder used the time on the main stage to make a commitment to the Ruby community:
"Let's make Ruby the best language for building AI apps, just like it's the best language for building everything else."— Michael Carroll, Founder of Coolhand Labs
We aren't going to stand on the sidelines and watch Ruby get, uh... sidelined in AI app development.
Coolhand Labs is making two big* commitments to the Ruby AI ecosystem:
* well, big for a bootstrapped startup like us 😉
Coolhand is 100% free for Ruby apps
Free until 2027 — and maybe further, if that's what it takes to make Ruby the top language for AI apps. What does that mean in practice? We won't count tokens coming from Ruby apps against your usage limits. That's basically giving your Ruby app no limits on our free tier. (JS and other languages still need to pay, though. 😉)
Until the end of the year, Ruby apps get Coolhand 100% free.
Free
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Up to 10M tokens/week
Tokens from Ruby apps don't count against this limit! - Cost insights dashboard
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5 optimization suggestions/week
Unlimited for Ruby apps -
Direct code fixes (PRs) at $2 each
Free for Ruby codebases! - 21-day data retention
Pro
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Up to 100M tokens/week
Tokens from Ruby apps don't count against this limit! - Cost & performance insights
- No optimization cap
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10 PRs/week included
Unlimited PRs for Ruby apps - Additional PRs at $1 each
- 90-day data retention
Power User
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No token cap
Ruby tokens aren't charged! - Cost & performance insights
- No optimization cap
- Unlimited PRs
- HIPAA compliance
- Volume pricing available for annual plans
We're funding the Ruby AI community directly
Even though we're a bootstrapped startup, we want to put some of the money from our initial traction back into the community. So we're funding 5 rising open source Ruby + AI projects with a no-strings-attached $500 donation in 2026. We define "rising" as having between 50 and 500 GitHub stars. We'll consider submissions on a rolling basis, until all the funding is spent.