Piston is an open-source code execution engine that runs code in more than 100 languages. It executes code in isolated, sandboxed environments. Online judges, coding platforms, and developer tools use it when they need to run untrusted code safely. The project documentation is hosted at piston.readthedocs.io. The listing describes the engine as high-performance.
How Piston API compares with its closest alternatives
All 5 closest alternatives have a free plan, as Piston API does. Among the 2 that list a starting price, the cheapest is Hugging Face at $9 a month and the median is $16.50. 4 of the 5 offer an API, as Piston API does. Piston API was founded in 2020; the alternatives were founded between 2016 and 2024, 2 of them earlier. The alternatives with a known headquarters are in the United States and Germany.
Market position · Coding
How Piston API compares in Coding
Piston API has low opportunity and sits in the bottom third of 499 live Coding tools on FalcoScan. Across Coding, the average opportunity score is 60.4 and the average saturation score 44.4. FalcoScan rates Piston API's own market position as open. 154 of the 499 operating Coding tools have hot momentum, and FalcoScan has recorded 16 shutdowns in the category.
Piston API compared with its closest alternatives
Product
Opportunity
Saturation
Pricing
Pricing from
Free plan
API
Platforms
Momentum
Piston APIFounded 2020
Low
Open
Free
—
Yes
Yes
API
Stable
Together AIFounded 2022 · San Francisco, United States
Piston is an open-source code execution engine from Engineer Man that runs untrusted code in sandboxes, using Isolate inside Docker. Its list of supported languages has 84 entries, and it is MIT licensed.
No. Since 15 Feb 2026 the public API at emkc.org is no longer open to everyone and needs an authorization token. Keys are given only to non-commercial educational projects with good cause, requested from Engineer Man on Discord.
Run the Docker image ghcr.io/engineer-man/piston in privileged mode on port 2000. The full setup, including the CLI, also needs Docker Compose, Node.js 15 or later and cgroup v2 enabled.
The closest alternatives to Piston API that are still running, matched on the AI capabilities, uses and audience they share, are Together AI, n8n, E2B, Qwen Agent, and Hugging Face.
Does Piston API have an API?
Yes. Piston API offers an API.
Who is Piston API for?
Piston API is built for developers.
How do I sign in to Piston API?
Sign in on Piston API's own website, piston.readthedocs.io. FalcoScan reviews Piston API but does not run its accounts, so logins, passwords and billing are handled by Piston API directly.