Codapi alternatives
The 5 alternatives below are grouped by kind of sandbox, and each says what it does differently from Codapi. Start from whatever made you look: missing GPUs, session limits, self-hosting, pricing or isolation.
Why teams look beyond Codapi
The simplest well-hardened run-code server to self-host; fine for doc snippets and stateless tool calls, not for agent workspaces.
- Stateless by design: no sessions, and the defaults allow 64 MB and 5 s per run
- Isolation is a hardened Docker container, not a VM or user-space kernel
- The hosted cloud is small (5,000 runs/month on the paid plan) and described as early-stage
- No Python or other backend SDK; only the HTTP API and the JavaScript widget
Codapi alternatives, by kind
Code execution APIs
Submit code, get output: online judges, compiler APIs and Jupyter kernels as a service.
glot.io
Open-source code playground whose runner, docker-run (MIT), executes every request in a fresh, single-use Docker container with network disabled; 44 languages on the hosted site.
- Single-use Docker container
- Open source
- Self-hostable
How it differs: A free playground and a minimal MIT runner for stateless, network-less snippet execution. Useful as a free playground or as a reference MIT container runner; not a supported API to build an agent product on.
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.
OneCompiler Code Execution API
Hosted run-code API behind the OneCompiler online IDE: one POST runs a multi-file program in 150+ languages and databases, billed per call or per credit with enterprise tiers that raise the runtime cap to 7-20 s.
- Not documented
How it differs: Cheap, high-volume stateless runs across 150+ languages and databases from a backend. A budget run-code endpoint with transparent pricing but an undocumented sandbox; suitable for simple stateless tool calls, not for workspaces.
Full profile →OneCompiler Code Execution API alternativesWebsite ↗
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.
Local sandboxes for coding agents
Isolation for agents like Claude Code, Codex or Gemini CLI on your own laptop.
Docker Sandboxes
Docker’s `sbx` CLI for running AI coding agents in microVM sandboxes on your machine, with an experimental Docker-hosted cloud.
- MicroVM
- Self-hostable
- GPU
- Pause/resume
How it differs: Running coding agents unsupervised on a laptop with microVM isolation. The easiest way to give local coding agents a real microVM boundary.
Codapi vs alternatives
| Sandbox | Isolation | Open source | Self-host / BYOC | Cold start (vendor) | Max session | Snapshots / pause | GPU | SDKs |
|---|---|---|---|---|---|---|---|---|
| Codapi | Locked-down Docker container | Yes | Yes / No | 1-3 s per run (claim) | 5 s default | No / No | No | REST API, JavaScript/TypeScript |
| Docker Sandboxes | MicroVM | No | Yes / No | Not documented | Until removed (local) | Yes / Yes | Yes | sbx CLI, TypeScript (cloud), REST API (cloud) |
| glot.io | Single-use Docker container | Yes | Yes / No | Not documented | Operator-set per run | 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 |
| OneCompiler Code Execution API | Not documented | No | No / No | Not documented | 7-20 s (enterprise) | No / No | No | REST API |
| Piston | isolate in Docker | Yes | Yes / No | Not documented | 3 s run / 10 s compile | No / No | No | REST API |
Frequently asked questions
What are the main alternatives to Codapi?
Cite this page
Agent Sandboxes. (2026). Codapi alternatives. agentsandboxes.org. Last reviewed November 9, 2026. https://agentsandboxes.org/alternatives/codapi/
Found an error or a missing sandbox? Submit a correction — every entry links to the sources it relies on.