ecc vs impeccable
Two of the top projects in Skills, plugins and rules, side by side: who leads on each score part and who each one suits, then setup, license, activity and what each review found.
ecc
Agents, skills, hooks and rules bundle for Claude Code, Codex and other harnesses
impeccable
Design skill with 24 commands and a detector for AI-generated frontends
Verdict
ecc ranks higher, 94 to 93. Of the 4 score parts we measure for both, ecc leads on 1, impeccable on 2 and 1 is even.
- Adoptionecc leads by 12 points, 99 to 87.
- FreshnessEven at 100.
- Maintenanceimpeccable leads by 2 points, 93 to 91: close to even.
- Agent-readyimpeccable leads by 15 points, 85 to 70: a wide gap.
Pick ecc if you are
Developers running Claude Code or Codex who want a preset agent workflow
- Large bundle: 71 agents, 311 skills, hooks and rules in one install
- Guided setup wizard for Claude Code, Codex and Kimi Code with dry-run mode
Pick impeccable if you are
Developers using AI coding agents who want better frontend design output
- Supports many harnesses: Claude Code, Cursor, Codex, Gemini CLI, Copilot, Grok Build, Hermes
- 59 deterministic detector rules run without an LLM or API key
| What we compare | ecc | impeccable |
|---|---|---|
| Score parts, out of 100 | ||
| Adoption | 99, widely used | 87, widely used |
| Freshness | 100, active | 100, active |
| Maintenance | 91, healthy | 93, healthy |
| Easy to run | Not scored for this kind | Not scored for this kind |
| Agent-ready | 70, partly | 85, ready |
| Facts from GitHub and the README | ||
| Stars | 279.5k | 81.2k |
| License | MIT (permissive) | Apache-2.0 (permissive) |
| Last commit | Oct 2026 | Oct 2026 |
| Last release | Oct 2026 | Oct 2026 |
| Language | JavaScript | JavaScript |
| Docker | Yes | No |
| GPU | Not needed | Not needed |
| arm64 or Apple Silicon | Not stated | Not stated |
ecc
ECC installs a plan, test, implement, review, verify workflow into coding agents. It ships 71 agents, 311 skills, 97 legacy command shims, hooks, selectable rules, session memory and the AgentShield scanner for prompts, hooks, MCP config and permissions. Native plugin paths exist for Claude Code and Codex; Cursor, OpenCode, Gemini, Zed and others get capability-limited adapters.
Who it is for: Developers running Claude Code or Codex who want a preset agent workflow
Strengths
- Large bundle: 71 agents, 311 skills, hooks and rules in one install
- Guided setup wizard for Claude Code, Codex and Kimi Code with dry-run mode
- Includes AgentShield scanning of MCP config, permissions, hooks and secrets
- MIT licensed; npm releases pinned per version tag
Weaknesses
- Feature parity varies; non-Claude harnesses are capability-limited adapters
- Claude plugins cannot ship rules, so rule packs need a manual copy
- Stacking install methods duplicates skills and hooks; README warns against it
- Private-repo GitHub App is paid (from $19/seat/month)
- no GPU
- Docker + Compose
- Needs Node.js 18+, Git, Claude Code 2.1+ (for plugin setup)
- Models: Claude Code, Codex, Kimi Code, Cursor, OpenCode
impeccable
Impeccable installs a single /impeccable skill into AI coding tools, with 24 commands such as audit, critique, polish, typeset and live browser variant iteration. It writes PRODUCT.md and DESIGN.md for project context, and ships 59 deterministic detector rules that run in a CLI and browser extension without an LLM or API key. Hooks flag common AI design tells on UI file edits in supported harnesses.
Who it is for: Developers using AI coding agents who want better frontend design output
Strengths
- Supports many harnesses: Claude Code, Cursor, Codex, Gemini CLI, Copilot, Grok Build, Hermes
- 59 deterministic detector rules run without an LLM or API key
- Edit hooks surface design findings; Cursor blocks bad writes before they land
- Several install paths: npx installer, Git submodule, plugin marketplace, manual copy
Weaknesses
- Native edit hooks are not available on every harness; Hermes and Veto get none
- Roll API at impeccable.style is called when a new design starts; telemetry is opt-out
- Downloads an engine binary into ~/.impeccable/bin/ on first run if not bundled
- Codex and Grok Build need manual hook or folder trust approval after install
- no GPU
- Needs Node.js (only for npx installer), impeccable.style roll API
- Models: Claude Code, Cursor, Codex CLI, Gemini CLI, GitHub Copilot
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