impeccable vs gstack
Two of the top projects in Skills, plugins and prompts, side by side: who leads on each score part and who each one suits, then setup, license, activity and what each review found.
impeccable
Design skill with 24 slash commands for AI coding agents' frontend output
gstack
Markdown slash-command skills that give Claude Code planning, review, QA and ship roles
Verdict
impeccable ranks higher, 96 to 95. Of the 4 score parts we measure for both, impeccable leads on 1, gstack on 1 and 2 are even.
- Adoptiongstack leads by 2 points, 98 to 96: close to even.
- FreshnessEven at 100.
- MaintenanceEven at 96.
- Agent-readyimpeccable leads by 15 points, 85 to 70: a wide gap.
Pick impeccable if you are
Developers using AI coding agents who want better frontend design output
- Installs into many agents: Claude Code, Cursor, Codex, Gemini CLI, Copilot, Grok Build, Hermes and more
- 61 detector rules run in the CLI and browser extension with no LLM or API key
Pick gstack if you are
Claude Code users wanting structured planning, review, QA and release workflows
- Claude Code is the only full-tier host; safety hooks like /careful and /freeze are enforced there
- Skills are plain Markdown, so they can be forked and edited
| What we compare | impeccable | gstack |
|---|---|---|
| Score parts, out of 100 | ||
| Adoption | 96, widely used | 98, widely used |
| Freshness | 100, active | 100, active |
| Maintenance | 96, healthy | 96, healthy |
| Agent-ready | 85, ready | 70, partly |
| Facts from GitHub and the README | ||
| Stars | 98.9k | 138.5k |
| License | Apache-2.0 (permissive) | MIT (permissive) |
| Last commit | Nov 2026 | Nov 2026 |
| Last release | Oct 2026 | Oct 2026 |
| Language | Rust | TypeScript |
| Docker | No | No |
| GPU | Not needed | Not needed |
| arm64 or Apple Silicon | Not stated | Mentioned |
impeccable
Impeccable installs a single `/impeccable` skill into coding agents such as Claude Code, Cursor, Codex CLI, Gemini CLI and GitHub Copilot. It adds 24 commands (audit, critique, polish, typeset, layout and others), a live browser variant mode, and 61 deterministic detector rules for common AI-generated design tells. `/impeccable init` writes a PRODUCT.md that later commands use as context.
Who it is for: Developers using AI coding agents who want better frontend design output
Strengths
- Installs into many agents: Claude Code, Cursor, Codex, Gemini CLI, Copilot, Grok Build, Hermes and more
- 61 detector rules run in the CLI and browser extension with no LLM or API key
- Edit hooks surface detector findings back to the agent on Claude Code, Copilot, Codex, Cursor and Grok
- Apache-2.0, with npx, git submodule, plugin and manual copy install options
Weaknesses
- Skill runs through a separate binary downloaded on first run into ~/.impeccable/bin/
- Design roll requests go to impeccable.style and telemetry is on unless you opt out
- Hooks need per-harness trust approval, and Hermes and Veto get no edit hook
- Writes many working files under .impeccable/ that need a manual .gitignore block
- no GPU
- Needs Node.js (only for the npx installer), An AI coding tool such as Claude Code, Cursor or Codex CLI, impeccable.style roll API (telemetry can be disabled)
gstack
gstack is a set of Markdown skills, exposed as slash commands such as /office-hours, /plan-ceo-review, /review, /qa, /cso and /ship, that split a coding session into roles: product, architecture, design, review, QA, security and release. Setup is a git clone into ~/.claude/skills plus a Bun-based ./setup script that also builds a bundled browser for QA. Claude Code is the full-tier host; Codex, OpenCode, Cursor, Kiro and others are experimental.
Who it is for: Claude Code users wanting structured planning, review, QA and release workflows
Strengths
- Claude Code is the only full-tier host; safety hooks like /careful and /freeze are enforced there
- Skills are plain Markdown, so they can be forked and edited
- Team mode auto-updates for shared repos with no vendored files
- Installs for multiple agents (Codex, Cursor, OpenCode, Kiro, Copilot CLI) via --host flags
Weaknesses
- Non-Claude hosts are experimental or instruction-only, and safety skills only advise there
- Outside reviews need a second CLI (Codex or Claude Code) installed and signed in
- /cso needs a recent Bun with specific build flags plus a native C toolchain
- README leads with the author's productivity claims, not behavior of the skills
- no GPU
- Needs Claude Code, Git, Bun 1.3.3+ (1.4.2 tested), Node.js (Windows only), Codex CLI (optional, outside reviews), OpenAI API key (optional, design binary)
- Models: Claude (Opus 5.5), OpenAI GPT-6 Astra, OpenAI GPT-6.1 Sol, OpenAI gpt-5.5 and gpt-image-2 (design binary)
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