head to head · open source
ECC vs Giselle
ECC has 263,046 GitHub stars, 39,368 forks, 204 open issues and last shipped today. Giselle has 557 stars, 124 forks, 0 open issues and last shipped 19 days ago. ECC leads on adoption by 47,125% (263,046 vs 557 stars). ECC is written in JavaScript under MIT; Giselle is written in TypeScript under Apache-2.0. ECC has attracted 15% as many forks as stars, Giselle 22%. 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, anthropic), 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 | Giselle | |
|---|---|---|
| GitHub stars | ★ 263K | ★ 557 |
| License | MIT | Apache-2.0 |
| Written in | JavaScript | TypeScript |
| Last push | 2026-09-20 | 2026-09-01 |
| Forks | ⑂ 39K | ⑂ 124 |
| Self-hosting | Yes | Yes |
| Data ownership | Your server | Your server |
pick ECC if
- You weight community size — 263K stars and counting
- You want the MIT license terms
- Your stack matches JavaScript
- You value the larger contributor base for long-term maintenance
pick Giselle if
- You want the Giselle feature set and don't need the biggest community
- You prefer the Apache-2.0 license terms
- Your stack matches TypeScript
- You evaluated both and Giselle 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 Giselle
Giselle is an open source AI app builder for agentic workflows, distributed under the Apache License 2.0 and written primarily in TypeScript. It lives in the JavaScript and TypeScript ecosystem, built around Next.js, and it describes itself as an AI agent studio that powers product delivery by enabling human AI collaboration. The project is developed in public on GitHub, has a hosted counterpart at giselles.ai, and carries topics such as agent, agent builder, agentic ai, ai agent, multiagent, and generative ai.
read the full Giselle overview →
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Frequently asked questions
Is ECC or Giselle more popular?
ECC has 263,046 GitHub stars and Giselle has 557. ECC has the larger community by that measure.
Are ECC and Giselle free?
Both are open source. ECC is licensed under MIT and Giselle under Apache-2.0. Neither carries a licence fee.
What is the difference between ECC and Giselle?
ECC is written in JavaScript and Giselle in TypeScript. 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 Giselle?
Choose ECC if you want the larger community (263,046 stars) or its MIT licence terms. Choose Giselle if its feature set, stack or Apache-2.0 licence fits better. Both are self-hostable.