OneCompiler Code Execution API alternatives
The 5 alternatives below are grouped by kind of sandbox, and each says what it does differently from OneCompiler Code Execution API. Start from whatever made you look: missing GPUs, session limits, self-hosting, pricing or isolation.
Why teams look beyond OneCompiler Code Execution API
A budget run-code endpoint with transparent pricing but an undocumented sandbox; suitable for simple stateless tool calls, not for workspaces.
- No documentation of the sandbox, memory limit or default timeout
- Internet access only on the top enterprise tier
- Stateless, with no sessions, files or packages persisting between calls
- No SDKs, self-hosting or compliance attestations are published
OneCompiler Code Execution API alternatives, by kind
Code execution APIs
Submit code, get output: online judges, compiler APIs and Jupyter kernels as a service.
Codapi
Lightweight Apache-2.0 sandbox server (a 3 MB Go binary) that runs each snippet in a locked-down Docker container, built for interactive documentation, with a hosted cloud at $5/month and free self-hosting.
- Locked-down Docker container
- Open source
- Self-hostable
How it differs: Embedding runnable snippets in docs and courses, or a tiny self-hosted run-code endpoint with strict defaults. The simplest well-hardened run-code server to self-host; fine for doc snippets and stateless tool calls, not for agent workspaces.
JDoodle Compiler API
Credit-metered compile-and-run REST and WebSocket API from the JDoodle online IDE, covering 114 languages, frameworks and databases, with each run costing one credit and a free daily allowance.
- Fresh sandbox per run (unnamed)
How it differs: Low-volume, pay-per-run execution with an interactive stdin stream for teaching and demo products. A convenient credit-metered compiler API for demos and courses; limits and isolation are too thinly documented for untrusted agent workloads at scale.
Judge0
Open-source online code execution system (GPL-3.0) that runs each submission in an isolate sandbox, offered as Judge0 Cloud via RapidAPI or directly and as a self-hosted Docker Compose stack.
- isolate (namespaces/cgroups)
- Open source
- Self-hostable
How it differs: Batch "submit code, get stdout" judging in 60-90+ languages with per-submission CPU, wall-clock and memory limits. The reference open-source online judge: ideal for stateless, time-boxed code evaluation at scale, but not a workspace an agent can return to.
Piston
MIT-licensed code execution engine that runs each submission in an isolate sandbox inside a Docker container, with a public API at emkc.org restricted to approved non-commercial projects since February 2026.
- isolate in Docker
- Open source
- Self-hostable
How it differs: Self-hosted, stateless execution of untrusted snippets in 80+ languages with isolate-level sandboxing. A solid self-hosted judge engine for stateless snippet execution; treat the public emkc.org API as unavailable for commercial agents.
Sphere Engine
Commercial code execution service from the makers of Ideone and SPOJ: a Compilers API for 80+ languages, a Problems API for test-case grading and a Containers product for multi-file projects, priced by quote.
- Isolated workspace (unnamed)
- Self-hostable
How it differs: Assessment and e-learning products that need a supported, commercially backed compile-and-run API with test-case grading. A commercially supported judge for assessment platforms; agents get a reliable but stateless and quote-priced execution backend.
OneCompiler Code Execution API vs alternatives
| Sandbox | Isolation | Open source | Self-host / BYOC | Cold start (vendor) | Max session | Snapshots / pause | GPU | SDKs |
|---|---|---|---|---|---|---|---|---|
| OneCompiler Code Execution API | Not documented | No | No / No | Not documented | 7-20 s (enterprise) | No / No | No | REST API |
| Codapi | Locked-down Docker container | Yes | Yes / No | 1-3 s per run (claim) | 5 s default | No / No | No | REST API, JavaScript/TypeScript |
| JDoodle Compiler API | Fresh sandbox per run (unnamed) | No | No / No | Not documented | Not documented | No / No | No | REST API |
| Judge0 | isolate (namespaces/cgroups) | Yes | Yes / No | Not documented | 5 s wall (max 20 s) | No / No | No | REST API, Python, JavaScript/TypeScript |
| Piston | isolate in Docker | Yes | Yes / No | Not documented | 3 s run / 10 s compile | No / No | No | REST API |
| Sphere Engine | Isolated workspace (unnamed) | No | Yes / No | Not documented | 5 s (1-15 s) | No / Not documented | No | REST API, PHP, Python, JavaScript/TypeScript |
Frequently asked questions
What are the main alternatives to OneCompiler Code Execution API?
Cite this page
Agent Sandboxes. (2026). OneCompiler Code Execution API alternatives. agentsandboxes.org. Last reviewed November 9, 2026. https://agentsandboxes.org/alternatives/onecompiler/
Found an error or a missing sandbox? Submit a correction — every entry links to the sources it relies on.