head to head · open source
ECC vs runtime
ECC has 273,125 GitHub stars, 40,766 forks, 345 open issues and last shipped today. runtime has 1,677 stars, 461 forks, 212 open issues and last shipped 2 days ago. ECC leads on adoption by 16,187% (273,125 vs 1,677 stars). ECC is written in JavaScript under MIT; runtime is written in Go under Apache-2.0. ECC has attracted 15% as many forks as stars, runtime 27%. ECC was the more recently maintained of the two, and both are self-hostable with no licence fee. The two share 2 topic tags (ai-agents, llm), so they are genuine substitutes rather than adjacent tools.
Two open source projects, one decision. Both are free and self-hostable — the differences are community size, license terms, language stack and release pace.
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Side by side
| ECC | runtime | |
|---|---|---|
| GitHub stars | ★ 273K | ★ 1.7K |
| License | MIT | Apache-2.0 |
| Written in | JavaScript | Go |
| Last push | 2026-10-05 | 2026-10-03 |
| Forks | ⑂ 41K | ⑂ 461 |
| Self-hosting | Yes | Yes |
| Data ownership | Your server | Your server |
pick ECC if
- You weight community size — 273K stars and counting
- You want the MIT license terms
- Your stack matches JavaScript
- You value the larger contributor base for long-term maintenance
pick runtime if
- You want the runtime feature set and don't need the biggest community
- You prefer the Apache-2.0 license terms
- Your stack matches Go
- You evaluated both and runtime fits your workflow better
About ECC
ECC is an MIT licensed open source agent harness performance optimization system that gives AI coding agents a coordinated engineering workflow — plan, test, implement, review, verify, remember, improve — for developers working in Claude Code, Codex, OpenCode, Cursor, and other harnesses.
About runtime
E2B Runtime is the open source Go backend — control plane, Firecracker orchestrator, in VM agent, edge router, and template builder — that powers E2B's AI agent cloud and can be run by anyone on their own hardware.
read the full runtime overview →
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Frequently asked questions
Is ECC or runtime more popular?
ECC has 273,125 GitHub stars and runtime has 1,677. ECC has the larger community by that measure.
Are ECC and runtime free?
Both are open source. ECC is licensed under MIT and runtime under Apache-2.0. Neither carries a licence fee.
What is the difference between ECC and runtime?
ECC is written in JavaScript and runtime in Go. The practical differences are community size, licence terms, language stack and release cadence — all compared in the table above.
Which should I choose, ECC or runtime?
Choose ECC if you want the larger community (273,125 stars) or its MIT licence terms. Choose runtime if its feature set, stack or Apache-2.0 licence fits better. Both are self-hostable.