Grok App Builder
Grok App Builder
One-line summary: xAI chat + live preview sandbox that auto-lists skills from .grok/skills; isolated Linux workspace with preview on 0.0.0.0:8080; no git-as-the-user's-Mac, no Paper MCP, no local debug.
Vintage: 2026-08-23. First-party session log on Ion Wake (
pmcclelland/ion-wake). One data point about this author's harness, not a market ranking.
What it is
An xAI chat surface with a live preview sandbox. Skills are auto-listed from .grok/skills (especially design-ui for overlay/HUD). The session log lists skill triggers that still hold: design-ui, building-games, controls. It speaks in product terms to a chat-only user. It is not the same discovery path as cursor, Cursor Cloud Agents, or grok-bot.
Why it matters to this thread
It is the builder-sandbox half of a first-party practitioner split: Grok App Builder owns the opinionated playable-preview contract; Cursor owns git, paper-desktop, local debug, and cloud handoff. Collapsing the four surfaces into one “Grok on Cursor” blob loses the skill-loading failure mode. See agent-skill-discovery and grok-skills-isolation-to-cursor-symlink.
Key facts (from 2026-08-23-session-cursor-paper-grok-app-builder-workflow)
- Isolated Linux workspace; preview on
0.0.0.0:8080. - Skills auto-listed from
.grok/skills. - Sees a repo snapshot in the sandbox — “No git history as the user’s Mac, no Paper MCP, no local debug.”
AGENTS.mdin the repo still says “you are Grok Build” and tells agents to consult Grok skills; it does not inject the skill bodies.- Do not send “make it match Paper” here — no Paper, no git.
Strengths (from this session)
- Opinionated playable bar, skill triggers (
design-ui,building-games,controls), isolation, preview contract.
Weaknesses / concerns
- Single first-party session. No pricing, adoption, or independent review in this source.
- No Paper, no git-as-Mac, no local debug — a Paper-blind coder if asked to match an artboard.
- Cursor / Cloud / Grok Bot do not auto-list
.grok/skillsunless those skills are exposed into git as.cursor/skills.
Open questions
- Where this sandbox sits relative to the April 2026 vibe-coding-app-builders ranking (Lovable / Bolt / v0 / Replit). This source does not place it in that ranking.