E2B vs harnessrouter
E2B is much bigger: 13.9k stars against 2.4k. Over the days we have tracked them E2B moved +6.6% and harnessrouter +321.5%, so harnessrouter is growing faster right now.
harnessrouter leads on context depth. E2B does not take any axis by a clear margin.
Stars and commit dates come from our own daily tracking. The six axes are read off each project's documentation by our review pipeline, so they describe what a project says about itself, not what we measured in its code.
Where they stand today
Provides secure, isolated cloud sandboxes for running AI-generated code with SDKs for JavaScript and Python, allowing real-world tool access in a managed environment.
- Stars
- 13.9k
- Tracked growth
- +6.6%
- Maturity
- ●●●●●
- Last commit
- 21h ago
- Language
- Python
- License
- Apache-2.0
- Cost to run
- E2B cloud (API key); self-hostable
A single-container, self-hosted runtime implementing the Unified Harness Protocol that runs multiple agent harnesses locally with your keys and no telemetry.
- Stars
- 2.4k
- Tracked growth
- +321.5%
- Maturity
- ●●●●●
- Last commit
- 16m ago
- Language
- Python
- License
- Apache-2.0
- Cost to run
- Your API key; provider billing applies
Six axes, head to head
Each axis runs 0 to 5. The label under a score is what that project's own docs claim, not a category average.
| Axis | E2B | harnessrouter |
|---|---|---|
Context depth How much of your codebase it sees before it answers: the open diff, the diff plus related files, or the whole repository. | ●●●●● Command-only | ●●●●● Whole-repo analysis |
Noise control How it keeps output volume down — severity thresholds, deduplication, incremental runs over new commits only. | ●●●●● None | ●●●●● Minimal controls |
Customization How far it bends to your team: custom rules, prompts, style guides, per-path config. | ●●●●● Minimal config | ●●●●● Integration & policies |
Privacy Whether your code stays on your own infrastructure: fully local, self-hostable, or cloud API only. | ●●●●● Self-hostable | ●●●●● Self-hosted (provider keys) |
Model freedom Whether you can point it at any provider, or it is wired to one. | ●●●●● Bring-your-own-key | ●●●●● Bring-your-own-key |
Setup ease What it takes to get a first useful run out of it. | ●●●●● API key + SDK | ●●●●● Docker + API key |
Which one to pick
Pick E2B if…
Secure sandboxing — choose E2B when you need to execute AI-generated code safely in isolated sandboxes with an option to self-host your infrastructure.
Pick harnessrouter if…
Privacy-first — a one-container, self-hosted agent runtime that keeps keys and data on your infrastructure while supporting many provider backends.
- Context depth: Whole-repo analysis (5/5 against 1/5)
What people want from each one
e2b-dev/E2B
HarnessRouter/harnessrouter
Questions people ask
Is E2B better than harnessrouter?
harnessrouter leads on context depth. E2B does not take any axis by a clear margin. E2B is worth picking when secure sandboxing — choose E2B when you need to execute AI-generated code safely in isolated sandboxes with an option to self-host your infrastructure.
Which of E2B and harnessrouter keeps my code private?
E2B: Self-hostable (4/5). harnessrouter: Self-hosted (provider keys) (4/5).
What does each one cost to run?
E2B: E2B cloud (API key); self-hostable. harnessrouter: Your API key; provider billing applies.
Full profiles: e2b-dev/E2B and HarnessRouter/harnessrouter. Everything else in Runtimes & sandboxes.