promptBrewer. — AI Prompt Refiner for Vibe Coders

promptBrewer. is an AI Prompt barista for vibe coders, vibe builders, and engineers. It combines Prompt Refiner (prompt engineering), Project Context (context engineering), Prompt Recipes, and .MD Roastery. Local-first. BYOK. On the house 3-day trial, then one-time lifetime coffee plans.

Stop DIY-refining in blank chat

Asking ChatGPT or Claude to improve this prompt is a one-off rewrite with session amnesia. It forgets your stack, drops IDE file tags, and resets every new tab. promptBrewer. brews a Guided Espresso Shot you can pour into Cursor, Claude Code, Copilot, Windsurf, or any chat model.

Prompt engineering + context engineering in one bar

Prompt Refiner crafts the instruction: role, context, task, format, constraints. Project Context and .MD Roastery decide what the model should always know — design tokens, PRD, API spec, schema, i18n. Together they shrink retries and token waste.

Built for vibe coding workflows

Vibe coding means guiding AI coding agents with natural-language intent. Weak prompts produce weak code. promptBrewer. packages intent clearly and keeps project memory attached so agents stay on-spec across sessions.

DesignMD — design system into Project Context

Extract design tokens from a URL or UI source into DESIGN.md + design-tokens.json. Attach once — stop re-pasting the whole style guide every brew.

ProjectMD — PRD for AI agents

Extract product structure into PROJECT.md so coding agents understand goals, flows, and features without a novel-length paste.

ApiSpecMD — REST context from UI

Infer endpoints and schemas from forms and lists into APISPEC.md for backend-aware prompts.

DBSchemaMD — schema context from UI patterns

Infer entities and relations into DBSchema.md (+ migration-oriented SQL) so agents stop inventing tables.

I18nMD — bilingual string extraction

Extract UI copy into I18N.md + en/id locale JSON for localization-aware brews.

On the house, then one coffee for life

Not a monthly LLM subscription. On the house = 3-day tasting after OAuth, no credit card. Then Grande, Venti (popular), or Double Venti — one-time coffee, lifetime tool access, priced in USD and IDR. BYOK means you pay your provider only for tokens you use.

Privacy-first architecture

Prompts, projects, and API keys stay in browser IndexedDB. Server keeps OAuth profile and coffee/support records only.

FAQ

What is promptBrewer.? A local-first AI Prompt barista for vibe coders. What is context engineering here? Project Context + .MD memory the model should always see. Who is it for? Vibe coders, builders, engineers — plus PMs and designers who need repeatable briefs.