ECC
The agent harness performance optimization system. Skills, instincts, memory, security, and research-first development for Claude Code, Codex, Opencode, Cursor
Our verdict
A well-maintained, widely adopted project. This assessment is derived from GitHub's own repository metrics on 2026-08-24, not from hands-on testing.
ECC is the agent harness performance optimization system. Skills, instincts, memory, security, and research-first development for Claude Code, Codex, Opencode, Cursor, built in JavaScript. It has 242,903 stars and 318 contributors, and it was pushed to within the last few weeks. The MIT licence puts no real constraint on commercial use. The most recent tagged release is v2.1.0, from 2026-07-27. Figures come from the GitHub API on 2026-08-26 and refresh daily.
Reviewed by AI Review Rating from GitHub API data How we score
Repository
- Licence
- MIT
- Language
- JavaScript
- Last push
- 2026-08-24
Releases
-
v2.1.0ECC 2.1.0: Plan Canvas, Kimi Harness, and Self-Hosted Compute -
v2.0.0ECC 2.0.0 - The Agent Harness Operating System -
v2.0.0-rc.1v2.0.0-rc.1 -
v1.10.0ECC v1.10.0 - Surface Refresh, Operator Workflows, and ECC 2.0 Alpha -
v1.9.0v1.9.0 - Selective Install, ECC Tools Pro, 12 Language Ecosystems -
v1.8.0ECC v1.8.0 - Harness Performance & Cross-Platform Reliability
Pros and cons
Pros
Pricing
- Free tierYes
- LicenceMIT
- Self-hostYes, source is public
- Public price listNot published
ECC does not publish a web price list. For consumer apps that usually means pricing appears inside the product; for enterprise tools it means talking to sales. Why we do this
Visit ecc.toolsTrends
Price points are recorded when a price moves, not on a schedule, so a flat run means the price held. Release cadence comes from GitHub releases. A series appears only once we have watched it for long enough to have more than one observation.
Changelog
On video
What users actually say
- Someone is using Nanobot/Openclaw/ecc with free API … Reddit · 2026
We link to discussions rather than reproducing them. Opinions belong to their authors.
User reviews
No one has reviewed ECC here yet. Reviews are moderated before they appear, and our own score is editorial and separate from user ratings, though once reviews land they do lift it.
Used ECC? Review it.
Sign in to rate it. One account, one review per tool, so the score means something.
Requiring an account is how we keep this page free of drive-by spam. We never sell your address.
ECC alternatives
LangChain
The agent engineering platform.
🥈 
Browser Use
🌐 Make websites accessible for AI agents. Automate tasks…
🥉 
Claude Mem
Persistent Context Across Sessions for Every Agent - Captures…
Langflow
Langflow is a powerful tool for building and deploying…
DeepSeek Harness
DeepSeek Harness: Everything is a Plugin.
Hermes Agent
The agent that grows with you
Side by side
| Tool | Our score | From | Free tier | Best for | |
|---|---|---|---|---|---|
| ECC this page | 8.1 | - | Yes | ||
| 🥇LangChain | 8.4 | $1 | Yes | ||
| 🥈Browser Use | 8.0 | - | Yes | ||
| 🥉Claude Mem | 7.8 | - | Yes | ||
| Langflow | 7.8 | - | Yes | ||
| DeepSeek Harness | 7.7 | - | Yes | ||
| Hermes Agent | 7.6 | - | Yes |
Questions
Is ECC free?
Yes. ECC advertises a free tier on its own site.
How much does ECC cost?
ECC does not publish pricing openly, which usually means it is quote-based. You will need to contact the vendor.
Is ECC open source?
Yes. ECC is a public repository released under MIT. You can self-host or inspect the source directly.
How is ECC scored here?
ECC scores 8.1 out of 10. That comes from a desk review of public evidence, which is capped at 8.5 out of 10: public pricing, documentation, maintenance signals and how much we could actually verify. Affiliate relationships are excluded from scoring entirely. The full rubric is published on our methodology page.