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Riza

WASM-isolated code interpreter API for LLM output, with no filesystem or network.

riza.iodocs.riza.io
Overall in sandbox providers
19of 19 · score 41.1
Data coverage
88%
23 of 26 fields sourced

Best for

  • •Executing model-written expressions with the tightest possible default
  • •Multi-language interpreter tooling without maintaining images
  • •You want deny-by-default network and filesystem out of the box

Strong on

  • +Idle cost free-when-stopped 1/19
  • +Cold start 120ms 1/16
  • +SDKs python, typescript, rest-api 2/19
  • +Runtimes python, javascript-typescript, ruby, php 2/18

Weak on

  • −Snapshot & fork No 16/19
    Better: Daytona: Yes
  • −Custom images No 17/19
    Better: E2B: Yes
  • −Streaming output No 16/17
    Better: E2B: Yes
  • −Max runtime 1min 18/18
    Better: E2B: 24h

vs Freestyle

  • •Ahead on SDKs: python, typescript, rest-api vs typescript, rest-api
  • •Ahead on Idle cost: free-when-stopped vs storage-only
  • •Behind on Streaming output: No vs Yes
  • •Behind on Persistent FS: No vs Yes

How Riza scores among 19 sandbox providers23 of 26 fields known

Runtime13

Cold start1st
120ms
1/16
Cold start (claimed)
—
Max runtime
1min
18/18
Leader: E2B · 24h
Persistent FS
No
17/19
Leader: Modal · Yes
docs.riza.io · 2026-01-15
Snapshot & fork
No
16/19
Leader: Daytona · Yes
Custom images
No
17/19
Leader: E2B · Yes
docs.riza.io · 2026-01-15
GPU
No
6/15
Leader: Modal · Yes
Runtimes2nd
python, javascript-typescript, ruby, php
2/18
Leader: boat · python, javascript-typescript, bash, go, rust, java, ruby, php, any-oci-image
Preview URLs
No
18/19
Leader: E2B · Yes
Browser inside
No
15/18
Leader: E2B · Yes
File up/download
Partial
11/19
Leader: E2B · Yes
Sydney region
No
8/18
Leader: Fly.io Machines · Yes
Concurrent limit
—

Isolation & network3

Isolation
wasm
15/19
Leader: E2B · microvm
docs.riza.io · 2026-01-15
Root in guest
No
18/19
Leader: E2B · Yes
docs.riza.io · 2026-01-15
Egress control
blocked-by-default
11/19
Leader: Daytona · allowlist
docs.riza.io · 2026-01-15

Agent integration3

MCP server
Partial
6/18
Leader: Daytona · Yes
SDKs2nd
python, typescript, rest-api
2/19
Leader: Runloop · python, typescript, rest-api, cli
Streaming output
No
16/17
Leader: E2B · Yes

Pricing3

Price / hour
N/A
riza.io · 2026-11-07
Meter2nd
per-request
2/19
Leader: Cloudflare Sandbox · per-10ms
Idle cost1st
free-when-stopped
1/19

Traction2

GitHub stars
—
Funding
seed
9/15
Leader: Fly.io Machines · series-c-plus

Positioning1

Positioning
A code interpreter API for safely running code written by LLMs.

Timeline1

Shipped
2024
5/16
Leader: Daytona · 2025

Alternatives8

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Sources2