Runloop

Runloop — Devboxes, blueprints and eval harnesses aimed at teams training coding agents. Runloop sells persistent devboxes plus the scaffolding around them: blueprints for reproducible environments, snapshots, and public benchmark harnesses for agent evaluation. The framing is narrower than E2B's — it is built for teams running SWE-bench-style evaluation loops and generating training data rather than general untrusted-code execution. If that is your workload, the surrounding tooling is worth more than the boot time. Founded 2023. Seed.

We track it in 1 comparison — Sandbox providers — so every claim below is a cell in a table you can open and check rather than an impression. Across those rosters it sits against 19 other tools, and what follows is where it visibly separates from them.

Where it wins.

• Snapshot & fork — Yes, which only 5 of 18 tools here manage.
• SDKs — python, typescript, rest-api, cli, the best figure of the 16 here.

Each of those is ranked against the whole roster on its category page, not against a hand-picked subset, so a first place here means first of everything we list.

Where it gives ground.

• Egress control — open, 13th of 16. Daytona records allowlist.
• Funding — seed, 9th of 15. Fly.io Machines records series-c-plus.

None of these disqualify it on their own. They are the fields to check against your own requirements before you commit, because they are the ones where a competitor genuinely does better.

Provenance. 24 of 26 tracked fields carry a value for Runloop, and 4 of those cite a document you can open. Last verified 2026-01-15. Every figure keeps its own provenance — measured by us, claimed by the vendor, inferred, or community-reported — and we would rather print a dash than a guess.

Its nearest neighbour in our data is ascii. Runloop is ahead on Meter (per-second against subscription) and Snapshot & fork (Yes against Partial). That pattern repeats across the rest of the roster — see Runloop alternatives for the other rivals, each compared the same way.

Founded

2023

Funding

Seed

Fields we track

24 of 26

Last verified

2026-01-15

The only provider here built around evaluation rather than production traffic — blueprints, snapshots and public benchmark scaffolding are the product and the sandbox is the substrate. Overkill if you just need to run some Python; the obvious pick if you measure an agent's pass rate every night.

Cold start

800 ms8th of 16

Inferred

Snapshot & fork

●Yes1st of 18

Vendor-claimedverified 2026-01-15source

Egress control

open13th of 16

Inferred

SDKs

pythontypescriptrest-apicli1st of 16

Inferred

Isolation

microvm1st of 16

Inferred

Custom images

●Yes1st of 20

Vendor-claimedverified 2026-01-15source

Streaming output

●Yes1st of 16

Inferred

Max runtime

1440 min1st of 16

Inferred

Runloop is the right call in these situations, each one drawn from a field we actually record:

• Running SWE-bench-style evaluation loops at scale.
• Generating training data from reproducible environments.
• You want a vendor whose roadmap targets agent researchers.
• Snapshot & fork is your binding constraint. Runloop records Yes, which only 5 of the 18 tools in the Sandbox providers roster do. We define that field as whether you can freeze a running sandbox and restore or clone it.
• SDKs is your binding constraint. Runloop records python, typescript, rest-api, cli, the best figure in the Sandbox providers roster. We define that field as officially maintained client libraries.

Reach for something else when any of the following is a requirement rather than a nice-to-have:

• Egress control. Runloop records open, 13th of 16 in the Sandbox providers roster. Daytona records allowlist on the same field. If that is a hard requirement rather than a preference, start elsewhere.
• Funding. Runloop records seed, 9th of 15 in the Sandbox providers roster. Fly.io Machines records series-c-plus on the same field. If that is a hard requirement rather than a preference, start elsewhere.

We publish this block because a comparison that only lists what a tool is good at is marketing. Every figure above sits on the same page as its source, and the field definitions are on the category tables if you want to check how we measured them.

What we don't know. 2 of the 26 fields we track for Runloop are still blank: Price / hour and GitHub stars. Those render as dashes rather than as zeroes or assumptions, because an empty cell and a bad cell are not the same thing and only one of them is honest. If you know any of these figures and can point at a document, tell us.