LAUNCH6 hours of free compute for every developer — no card required
Give your AI a computer.
And a budget.
Sub-second AI Computers with financial guardrails built in. Untrusted agent code boots on an isolated microVM in milliseconds — and spending stops dead at the cap. No Docker. No surprise bills.
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✓Allocating microVM · plan: small
✓Budget cap set: $5.00
✓Computer ready in 118ms
https://abc123.ostra.run
from fastapi import FastAPI
app = FastAPI()
@app.get("/")
def home():
return {"status": "alive"}Trusted by builders — developers, AI agents, and the next generation of software.
The problem
Stop trusting AI
with your laptop.
AI can generate thousands of lines of code.
Should it really run on your computer?
Ostra boots a brand-new AI Computer for every job — isolated, metered, capped.
Nothing survives.
# your machine, after one AI session
$ pip install → 3 conflicting numpy versions
$ brew upgrade → broke system Python
$ docker compose up → port 5432 already in use
$ rm -rf node_modules → again. and again.
$ curl | bash → you didn't read that script
# the same session, on Ostra
$ ostra new → fresh computer in 120ms, capped at $5
$ ostra rm → gone. nothing survives.
Financial guardrails
Your agent gets a wallet.
Not your credit card.
Give your AI agent hands, legs, and a budget — without risking your cloud bill. Every computer runs inside a hard spending limit enforced by the platform, not by hope.
Hard caps, not alerts
Set a budget per computer. When it's hit, the microVM is destroyed and billing stops with it.
Prepaid by design
Agents spend from a wallet you fund. An autonomous loop can drain a budget, never your credit card.
Billed hourly
You pay for the hours a computer is alive. Destroy it, and the meter dies with it.
Agent wallet
computer running
$0.0000
spent this run · billed hourly
End to end
See it working.
From an agent's first token to a live application — one continuous, isolated pipeline. No humans required in the loop.
cold start ~120ms · teardown instant · overspend impossible
Builders
Quietly load-bearing.
“We stopped reviewing AI code line-by-line and started just running it. Ostra made 'let the agent try it' a safe default instead of a risk.”
Placeholder Name
CTO, AI startup
“Our agents boot around 4,000 computers a day, each with a $2 cap. I've never once worried about the infra — or the bill. That's the whole point.”
Placeholder Name
Founding Engineer, agent platform
“Onboarding went from two days of environment setup to clicking a link. New engineers ship on day one now.”
Placeholder Name
Engineering Manager, Series B
Give every AI a safe computer.
Don't let generated code touch your machine — or your card. Run it on a computer with a budget.
6 hours free · No card required · First computer in ~120ms